development of low isotactic polyolefin

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Home Global production of polyolefin fibers TITLE Global production of polyolefin fibers PUB DATE October 2010 SOURCE Technical Textiles / Technische Textilen okt2010 Vol 53 Issue 5 p142 SOURCE TYPE Academic Journal DOC TYPE Article ABSTRACT The article reports that the global production of polypropylene (PP) and polyethylene (PE) fibers totaled 5 7 million tons in 2009 Development the use of new additives latest polymerization processes as well as blending solutions significantly increase polypropylene performance Hence today PP is less seen as a low cost solution but much more as a high performance material competing with traditional engineering plastics and sometime event metal (e g long glass fiber reinforced PP grades)


A polyolefin is a type of polymer produced from a simple olefin (also called an alkene with the general formula CnH2n) as a monomer For example polyethylene is the polyolefin produced by polymerizing the olefin ethylene Polypropylene is another common polyolefin which is made from the olefin prop

Polyolefin sheets or foams are used in a wide variety of packaging applications sometimes in direct contact with food [12] Polyolefin elastomer POE is used as a main ingredient in the molded flexible foam technology such as in the fabrication of self skinned footwear (for example Crocs shoes) seat cushions arm rests spa pillows etc Hydrogenated polyalphaolefin (PAO) is used as a radar

Polyolefin - wikipedia the free encyclopedia A polyolefin is any of a class of polymers produced from a simple olefin (also called an alkene with the general formula C n H 2n) as a monomer For example Polyolefin blends by domasius nwabunma - The definitive reference on the properties and applications of polyolefin blends Polyolefins account for more than half of total plastics consumption

topology low amount of branching Stereo chemistry is regular Examples: Isotactic PP (i-PP) HDPE (high density PE) Linear and branched structures Irregular stereo chemistry Examples: Polystyrene PMMA (Plexiglas) PC Strongly crosslinked dense 3D network Rigid intractable Degrades rather than

Sorbitol-type nucleating agents can be used to aid dispersion of polyhedral oligomeric silsesquioxane (POSS) molecules in isotactic polypropylene (iPP) and to promote self-assembly of POSS molecules into nanoparticles In this paper the interactions between a sorbitol-type nucleating agent and POSS molecules were investigated using polarized optical microscopy and rotational rheometry

Polypropylene (PP)

Polypropylene (PP) is a linear hydrocarbon polymer expressed as CnH2n PP like polyethylene (see HDPE L/LLDPE) and polybutene (PB) Polypropylene is a polyolefin or saturated polymer Polypropylene is one of those most versatile polymers available with applications both as a plastic and as a fibre in virtually all of the plastics end-use markets

Publications since 2009 2017 2016 2015 2014 2013 From Multisite Polymerization Catalysis to Sustainable Materials and All-Polyolefin Composites M Strzel S Mihan R Mlhaupt Chemical Reviews 2016 DOI: 10 1021/acs chemrev 5b0031 [419] Multifunctional POSS Cyclic Carbonates and Non-Isocyanate Polyhydroxyurethane Hybrid Materials H Blattmann R Mlhaupt Macromolecules

This finding will lead to size exclusion chromatography of low-mass molecules similar to gel permeation chromatography of macromolecules In order to demonstrate the effect of depletion force we selected and experimented with a system based on a polyolefin isotactic poly(4-methyl-1-pentene) (P4MP1) film and a normal alkane mixture and realized high molecular selectivity The P4MP1 film we

02 02 2006A permeable propylene-containing film structure including a core layer containing a propylene polymer matrix that has been cavitated by a two-component cavitation system wherein the first component of the two-component cavitation system is a beta-nucleating agent to produce the beta-crystalline form of polypropylene and the second component is a filler

In contrast isotactic polypropylene (iPP) has a melting temperature of ~170 C albeit that it is too stiff and brittle for application in cables and has a low Eb due to the influence of distinct spherulite boundaries [5] The use of blends of iPP with softer compatible polymers presents in principle a

Structure-property relations for polymer melts: comparison of linear low-density polyethylene and isotactic polypropylene A D Drozdov1 A Al-Mulla*2 and R K Gupta1 1Department of Chemical Engineering West ia University WV USA 2Department of Chemical Engineering Kuwait University Safat Kuwait (Received July 2 2012 Revised August 20 2012 Accepted September 5

In fact when a crystalline film made of polyolefin called isotactic poly(4-methyl-1-pentene) was immersed in a binary mixture of normal (straight-chain) alkanes the longer of the normal alkanes were selectively absorbed by the pores in the crystal This can be thought to be a spontaneous liquid separation due to molecular volume Of the conventional separation methods based on volume a

Author: Walter Kaminsky Hansjrg Sinn Publisher: Springer Science Business Media ISBN: 3642832768 Page: 442 View: 3012 DOWNLOAD NOW More than 30 years after the discovery of transition metals and organometal lics as catalysts for olefin polymerization these catalysts did not have lost their fascination

Semicrystalline thermoplastic elastomeric polyolefins

They have low Young's moduli large strains at break and better than 90% elastic recovery at strains of or less An isotactic polypropylene-block-regioirregular polypropylene-block-isotactic polypropylene-block-regioirregular polypropylene-block-isotactic polypropylene pentablock copolymer was synthesized that also shows exceptional elastomeric properties Notably microphase separation

With the development in the 1980s of more active and stereospecific supported Z-N catalysts the proportion of atactic polymer to crystalline isotactic polypropylene in the polymers produced was substantially reduced to typically less than 2 or 3 wt% Therefore the polypropylene product generally did not require additional purification steps to remove the atactic or low crystalline fraction

The method of modified polyolefin production is described It includes inoculation with non-saturated carboxylic acid or anhydride of non-saturated carboxylic acid on polyolefin by exposing shear strain from 50 to 1000% at 60-100C characterised in that preliminary ozonised polyolefin is used as polyolefin EFFECT: degree increase of monomer inoculation increasing pureness and adhesive

We report the design synthesis morphology phase behavior and mechanical properties of semicrystalline polyolefin-based block copolymers By using living stereoselective insertion polymerization catalysts syndiotactic polypropylene- block -poly(ethylene- co -propylene)- block -syndiotactic polypropylene and isotactic polypropylene- block -regioirregular polypropylene- block

We report the design synthesis and physical/mechanical properties of graft copolymers containing semicrystalline polypropylene side chains and amorphous ethylene/α-olefin copolymer backbones These materials a new class of semicrystalline polyolefin-based thermoplastic elastomers are made in two steps First allyl-terminated syndiotactic or isotactic polypropylene macromonomers are

N N-chelated nickel catalysts for highly branched polyolefin elastomers: a survey Qaiser Mahmood Qaiser Mahmood Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100190 People's Republic of China CAS Research/Education Center for Excellence in Molecular Sciences University of Chinese

AbstractInspired by the superhydrophobicity of juicy peach surface on which microscale hairs are standing vertically to the surface plane an extremely simple inexpensive physical method is developed for fabrication of superhydrophobic polyolefin surfaces over large areas This method includes three steps: abrasive paper scraping adhesive tape bonding and 90 peeling

Polyolefin is the most widely used and versatile commodity polymer In this work three types of polyolefin-based elastomers (PBEs) were adopted to toughen a high-flow polypropylene to improve its overall performance The chain microstructures of these PBEs including ethylene/1-octene (E/O) random copolymer from Dow Chemical′s polyolefin elastomer (POE) olefin block copolymers (OBCs) of E

Polyolefin surfaces are not effectively joined together by solvent welding because they have excellent chemical resistance and are unaffected by common solvents They can be adhesively bonded after surface treatment (they inherently have very low surface energies and don't wet-out well (the process of being covered and filled with resin )) and by some superglues ( cyanoacrylates ) and

Versatility ease of manufacture and relatively low cost make plastics some of the most useful materials for a wide range of applications This article explains the chemistry and production processes behind two of the most popular plastics — polyethylene and polypropylene

Polyolefin sheets or foams are used in a wide variety of packaging applications sometimes in direct contact with food [12] Polyolefin elastomer POE is used as a main ingredient in the molded flexible foam technology such as in the fabrication of self skinned footwear (for example Crocs shoes) seat cushions arm rests spa pillows etc Hydrogenated polyalphaolefin (PAO) is used as a radar