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Tacticity and Coordination Polymerization
 
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TACTICITY AND COORDINATION POLYMERIZATION There are three types of Polymers which depends on special arrangement on groups which are in making of Polymers: 1) Isotactic Polymers 2) Syndiotactic Polymers 3) Atactic Polymers
Views: 11501 vedupro
Tacticity-Isotactic, syndiotactic, Atactic Polymer-Engineering Chemistry-1 Notes(CY6151)
 
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Anna University Engineering Chemistry Notes-1(CY6151) Unit-1 Polymer Chemistry Properties of Polymer Stereospecific Polymer or Tacticity Isotactic, Syndiotactic and Atactic Polymer
Views: 13583 vijaya rajadurai
Polypropylene
 
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This video describes polypropylene structures, its production methods, properties and applications
Polymers - Crash Course Chemistry #45
 
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You can directly support Crash Course at http://www.subbable.com/crashcourse Subscribe for as little as $0 to keep up with everything we're doing. Also, if you can afford to pay a little every month, it really helps us to continue producing great content. Did you know that Polymers save the lives of Elephants? Well, now you do! The world of Polymers is so amazingly integrated into our daily lives that we sometimes forget how amazing they are. Here, Hank talks about how they were developed an the different types of Polymers that are common in the world today, including some that may surprise you. -- Table of Contents Commercial Polymers & Saved Elephants 0:00 Ethene AKA Ethylene 2:29 Addition Reactions 3:08 Ethene Based Polymers 4:44 Addition Polymerization & Condensation Reactions 6:32 Proteins & Other Natural Polymers 8:33 -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com Support CrashCourse on Subbable: http://subbable.com/crashcourse
Views: 1034791 CrashCourse
Organic Addition Polymers 2. Production of HDPE
 
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This short video takes a relatively simplistic look at the action of a Zeigler-Natta catalyst in the production of High Density Polyethene (HDPE). HDPE molecules have little branching, resulting in a more crystalline structure and higher melting temperature.
Views: 16679 FranklyChemistry
Mod-01 Lec-23 Polymer Stereochemistry and Coordination Polymerization
 
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Polymer Chemistry by Dr. D. Dhara,Department of Chemistry and Biochemistry,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
Views: 4680 nptelhrd
A.5 Isotactic and atactic polymers (SL)
 
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Understandings: Isotactic addition polymers have substituents on the same side. Atactic addition polymers have the substituents randomly placed.
Views: 1224 Mike Sugiyama Jones
Mod-08 Lec-02 Polymers:Polyolefins,Polyethylene,Polypropylene Polystyrene
 
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Chemical Technology - I by Dr. I.D.Mall,Department of Chemical Engineering,IIT Roorkee.For more details on NPTEL visit http://nptel.ac.in
Views: 4666 nptelhrd
anionic polymerization
 
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Views: 14557 sonny -
Mod-01 Lec-24 Polymer Stereochemistry and Coordination Polymerization (Contd.)
 
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Polymer Chemistry by Dr. D. Dhara,Department of Chemistry and Biochemistry,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
Views: 1827 nptelhrd
Recrystallization of polypropylene in polystyrene / polypropylene blend
 
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A blend of polystyrene (PS) and polypropylene (PP) was heated to 140°C to melt the syndiotactic PP and then cooled at a constant rate while imaging at one frame per minute. As the sample cools, the continuous PP phase first nucleates and then forms partly ordered, semicrystalline regions. Some of the regions form on top of the PS spherical domains. Imaged with the Cypher ES AFM; scan size 4 μm.
Views: 984 AsylumResearchVideo
Polymerization POLYPROPYLENE
 
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จัดทำโดย นางสาว ศิริธรฑ์ นาดี รหัส115610400397-4 POE56147 เสนอ ผศ.ดร. สมหมาย ผิวสอาด รายวิชา Polymerization Processing
Ziegler Natta catalyst
 
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Polymerization of Alkenes|Alkene-11|
 
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Polymerization of Alkenes|Alkene-11|
Views: 702 ChemAkash
64- Ethylene polymerization
 
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Ethylene polymerization: initiation, propagation and termination of polyethylene
Polypropylene
 
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Polypropylene Polypropylene enjoys wide application in technology engineering. This is a synthetic thermoplastic non-polar polymer classified as polyolefin. It is the product of propylene polymerization. Polypropylene is a solid white material with the chemical formula of C3H6. Propylene polymerization results in polypropylene linear molecule whose building blocks include -CH2-CH- bond with CH3 methyl side group. According to the methyl group position in the polymer chain, polypropylenes fall under: atactic polypropylenes whose methyl groups are located randomly at both sides of the polymer chain; syndiotactic polypropylenes whose groups have alternate positions along the chain; and isotactic polypropylenes whose all methyl groups are located on the same side of the polymer chain. Such polypropylenes are 50% more rigid and 25% harder than atactic polypropylenes. Polypropylene's physical, chemical, mechanical and electric properties greatly depend on the macromolecular structure. Polypropylene is marked as double-P both in Cyrillic and Latin alphabet. Polypropylene is a plastic material demonstrating high impact and cross-breaking strength. It is wear-resistant and has good electric insulation properties within wide temperature ranges. It is also chemically stable and water-resistant. Polypropylene products are manufactured based on all thermoplastic material processing technologies. Polypropylene finds wide application in the industry. It is used to produce packaging and car components, case works and pipelines. It is also widely used in electronic engineering. Polypropylene is used to produce packages to a lesser extent, however, than polystyrene and ABS resins. But unlike the latter, polypropylene packages can stand load impacts and are more resistant to abrasion damages. That's why they can be used under unfavorable environment. Polypropylene is used as a dielectric material in capacitors, for instance, in Russian K78-2 capacitors or as electric insulation. Recently, polypropylene has earned a great deal of popularity as internal insulators in high-voltage cables and has become a good substitute for polyethylene.
Views: 22337 ChipDipvideo
Mechanism Of Anionic Addition Polymerisation|Mechanism Of Preparation Of Polystyrene From Styrene|
 
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Mechanism Of Anionic Addition Polymerisation|Mechanism Of Preparation Of Polystyrene From Styrene By Patsariya Classes Gwalior Mob 9039499897
Views: 130 Patsariya Classes
Understanding polymerization
 
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This video is about understanding the polymerization of polythenes. #breakthroughjuniorchallenge
Views: 300 Nathalie White
Polymerization using Zeigler-Natta catalysis is advantageous over free radical
 
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polymerization because A..it gives highly branched with high degree of crystallinity B..it gives linear polymer molecules permitting stereochemical control C..it can lead to living polymers via anionic polymerization D..it permits step reaction polymerization resulting in a highly cross linked polymer
Views: 503 MyProgressCard
Stereo Chemistry and Classification of Polymers
 
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For 12th and B.Sc 3rd students
Views: 460 Dr. Devesh Sharma
cationic polymerization
 
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Views: 18218 sonny -
A 5.4 Polymer tacticity
 
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IB chemistry Option A: materials
Views: 1362 Rostam Afshinnekoo
Melting and recrystallization of a sPP-PS polymer film
 
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This movie shows a polymer thin film consisting of syndiotactic polypropylene (sPP) and polystyrene (PS) that was imaged as a function of changing temperature on the Cypher ES AFM using blueDrive photothermal excitation. The scan size is 3 µm and the data channel shown is phase because it shows the most contrast. The round, isolated domains are PS and the continuous matrix around them is the sPP. Note that the melting temperature of sPP is ~ 130-170°C while the melting temperature of PS is ~240°C. The movie starts with the sample at ~60°C. It is then slowly heated to ~135°C, during which time you can observe the PP crystallites melt, diminishing in size and forming a melted layer. You can actually see the high motility of the crystallites in the melt. Notably the heating is stopped before the sPP is fully melted and the sample is then slowly cooled. The remaining crystallites act as nucleation sites, recrystallizing and growing. Once the temperature has returned to 60°C, you see larger features appear. Note that the recrystallization occurs much differently if the sPP is fully melted. This case can be seen in another movie here http://www.asylumresearch.com/Gallery/Movies/Movie23.shtml.
Views: 1858 AsylumResearchVideo
Syndiotactic PP
 
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Views: 290 pcpainter1
Polymerization mechanism with alkene addition Reaction #7
 
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The mechanism of alkene addition polymerization using an acid catalyst is worked out. Additionally examples of polymer and monomers are shown to show the connection between a styrene and a polystyrene structural representation as well as polyethene + ethene and polyvinyl chloride and vinyl chloride. More reaction mechanisms and organic chemistry/IB chemistry resources can be found here: https://sites.google.com/site/thechemistrytranslator/chemistry---milam-plymouth/ib-chem-milam-hl
Views: 5897 Scott Milam
Zieglar Natta Catalyst
 
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Views: 7785 Gupta Namrata
Mechanism of Step Growth Polymerisation | Class 12 Chemistry Polymers
 
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Scholarslearning.com is an online education portal that provides interactive study material for students of classes 6th to 12th for CBSE. Complete with elaborate live classes, multimedia tutorials, interactive exercises, practice tests and expert help, we endeavor to make school easy for students and help them score more. We also provide free NCERT solutions, subject-wise synopses and chapter-wise revision notes for classes 6th to 12th for a thorough understanding of concepts right from a basic to an advanced level of difficulty. Download scholarslearning app from android and ios .
Organic Addition Polymers 2. Polyphenylethene (polystyrene).
 
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A short animation to show the addition polymerisation of phenylethene (formerly known as styrene). There is an accompanying video that shows the formation of polythene, pvc and polypropylene.
Views: 1192 FranklyChemistry
202421KUPDC Gas Phase Polymerization of Ethylene
 
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ASPEN Dynamics for Gas Phase Polymerization of Ethylene
Suspension polymerization
 
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Views: 1399 Tamara F
karl ziegler
 
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Views: 155 zero8jack
Polypropylene Catalysts Market Trends & Forecast by 2019
 
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- http://bit.ly/polypropylene-catalyst Polypropylene Catalyst Market research report categorizes the global market by PP Manufacturing Process (Bulk Slurry, Gas phase and Solvent), Type (Co-Catalyst systems, Metallocene, and Ziegler–Natta)& by Geography
Views: 133 Kailash S.
Crystallization of polymers
 
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Crystallization of polymers is a process associated with partial alignment of their molecular chains. These chains fold together and form ordered regions called lamellae, which compose larger spheroidal structures named spherulites. Polymers can crystallize upon cooling from the melt, mechanical stretching or solvent evaporation. Crystallization affects optical, mechanical, thermal and chemical properties of the polymer. The degree of crystallinity is estimated by different analytical methods and it typically ranges between 10 and 80%, thus crystallized polymers are often called 'semicrystalline'. The properties of semicrystalline polymers are determined not only by the degree of crystallinity, but also by the size and orientation of the molecular chains. Polymers are composed of long molecular chains which form irregular, entangled coils in the melt. Some polymers retain such a disordered structure upon freezing and thus convert into amorphous solids. In other polymers, the chains rearrange upon freezing and form partly ordered regions with a typical size of the order 1 micrometer. Although it would be energetically favorable for the polymer chains to align parallel, such alignment is hindered by the entanglement. Therefore, within the ordered regions, the polymer chains are both aligned and folded. Those regions are therefore neither crystalline nor amorphous and are classified as semicrystalline. Examples of semi-crystalline polymers are linear polyethylene, polyethylene terephthalate, polytetrafluoroethylene or isotactic polypropylene. Whether or not polymers can crystallize depends on their molecular structure – presence of straight chains with regularly spaced side groups facilitates crystallization. For example, crystallization occurs much easier in isotactic than in the atactic polypropylene form. Atactic polymers crystallize when the side groups are very small, as in polyvinyl and don't crystallize in case of large substituents like in rubber or silicones. Nucleation starts with small, nanometer-sized areas where as a result of heat motion some chains or their segments occur parallel. Those seeds can either dissociate, if thermal motion destroys the molecular order, or grow further, if the grain size exceeds a certain critical value. Apart from the thermal mechanism, nucleation is strongly affected by impurities, dyes, plasticizers, fillers and other additives in the polymer. This is also referred to as heterogeneous nucleation. This effect is poorly understood and irregular, so that the same additive can promote nucleation in one polymer, but not in another. Many of the good nucleating agents are metal salts of organic acids, which themselves are crystalline at the solidification temperature of the polymer solidification. Crystal growth is achieved by the further addition of folded polymer chain segments and only occurs for temperatures below the melting temperature Tm and above the glass transition temperature Tg. Higher temperatures destroy the molecular arrangement and below the glass transition temperature, the movement of molecular chains is frozen. Nevertheless, secondary crystallization can proceed even below Tg, in the time scale of months and years. This process affects mechanical properties of the polymers and decreases their volume because of a more compact packing of aligned polymer chains. The chains interact via various types of the van der Waals forces. The interaction strength depends on the distance between the parallel chain segments and it determines the mechanical and thermal properties of the polymer. Video Empire produces videos read aloud. Use the information in this video at your own risk. We cannot always guarantee accuracy. This video uses material from https://en.wikipedia.org/wiki/Crystallization_of_polymers, licensed with CC Attribution-ShareAlike 3.0. This video is licensed with CC Attribution-Share-Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0/us/ In order to adapt this content it is required to comply with the license terms. Image licensing information is available via: https://en.wikipedia.org/wiki/Crystallization_of_polymers
Views: 2718 Video Empress
Stereospecific polymer Meaning
 
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Video shows what stereospecific polymer means. A polymer that has a specific spatial arrangements of its constituent atoms, leading to an almost crystalline structure. stereospecific polymer synonyms: stereoregular polymer. Stereospecific polymer Meaning. How to pronounce, definition audio dictionary. How to say stereospecific polymer. Powered by MaryTTS, Wiktionary
Views: 639 ADictionary
Mod-04 Lec-11 Structure and Properties of Polymers (Contd. )
 
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Science and Technology of Polymers by Prof. B. Adhikari,Department of Metallurgy and Material Science,IIT Kharagpur.For more details on NPTEL visit http://nptel.ac.in
Views: 1698 nptelhrd
Polymers
 
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Polymers

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