Polyolefins polyolefin

Polyolefins - Polyolefins are now manufactured using alternatives such as hydrocarbons, HCFC22 and -142b, injected carbon dioxide, and HFC152a. Hydrocarbons and injected carbon dioxide will be long-term alternatives. 

Silicone Polydimethylsiloxane Works by producing a char surface Polyolefins, polyolefin blends, EVA, polycarbonate, polyurethane Dow Corning, GE Silicones... 

Polyolefins. Polyolefin fibers are produced from the polymerization of ethylene or propylene gas. The catalysis research of Ziegler and Natta led to the development of these polymers to form crystalline polymers of high molecular weight. Hercules Inc. produced the first commercial fibers in 1961. The fibers made from these polymers are melt-spun. The cross-sections are round, and the fibers are smooth. They have extremely low dye affinity and moisture absorbance. Colored fiber is normally produced by mixing pigments in the melt polymer prior to extrusion. 

There have been recent efforts to predict, or at least rationalize, the x parameters of these and other polyolefin-polyolefin blends. Bates et al. (1992) and Fredrickson et al. (1994) suggest that the x parameter is correlated to a difference in statistical segment length of the polymer molecules, on a volume-normalized basis. The volume normalization is required because the definition of the statistical segment length depends on how the monomer unit... 

Polyolefins - Polyolefins such as polypropylene and polyethylene continue to attract widespread interest. A number of interesting papers have appeared on... 

Polyolefin - Polyolefins are a large class of carbon-chain elastomeric and thermoplastic polymers usually prepared by addition (co)polymerization of olefins or alkenes such as ethylene. The most important representatives of this class are polyethylene and polypropylene. There are branched and linear polyolefins and some contain polar pendant groups or are halogenated. Unmodified polyolefins are characterized by relatively low thermal stability and a nonporous, nonpolar surface with poor adhesive properties. Processed by extrusion, injection molding, blow molding, and rotational molding. Other thermoplastic processes are used less frequently. This class of plastics is used more and has more applications than any other. Also called olefinic resin, olefinic plastic. 

Polyolefins.—Polyolefin oxidation continues to be a subject of considerable controversy. Wiles and co-workers have written a comprehensive review of polyolefin photo-oxidation mechanisms with particular emphasis on the role of... 

The fourth trend is spurred by environmental sustainability concerns and the need for increased recyclability and reuse of polyolefin blends. In this regard, there is increasing replacement of PVC by polyolefin-polyolefin blends. There is also an increase in recyclability of EPDM mbber vulcanizates since EPDM is the fastest growing elastomer among synthetic rubber and the most used of nontire rubbers. Also, cryogenically ground rubber tires are being used as fillers for polyolefin blends such as LLDPE/HDPE. 

This book is stmctured as follows Chapter 1 serves as a guide to polyolefin blends introducing this important class of materials, why they are important, typical systems studied, issues of fundamental and applied interest, and current trends. The contributed chapters are divided into two main categories polyolefin/polyolefin blends (Chapters 2-16) and polyolefin/nonpolyolefin blends (Chapters 17-21). Issues covered in these chapters include miscibility, phase behavior, functionalization, compatibilization, microstructure, crystallization, hierarchical morphology, and physical and mechanical properties. Most of the chapters are in the form of review articles. Some original articles are included to capture the latest development in polyolefin blends research. 

Uses Lt. stabilizer for polyolefins, polyolefin-elastomer blends, fiber, tape, film, articles, food-contact propylene polymers/copolymers... 

Oxidative induction time (OIT) provides an index useful in comparing the relative resistance to oxidation of a variety of hydrocarbon materials. The OIT procedure was first developed in 1975 by Gilroy and coworkers at Bell Laboratory as a test procedure to screen polyethylene insulation used in telephone wire and cable for its oxidation resistance. The method first became available as a Western Electric Specification and later as ASTM Test Method for Copper-Induced Oxidative Induction Time of Polyolefins. Polyolefin manufacturers quickly embraced the procedure and began to apply it to other applications including raw resins, finished pipes, wire and cable insulation, and, most recently, geosynthetic waste pit liners (ASTM D3895 2009). 

J Keating. Minerals used in polyolefins. Polyolefins 95 SPE Conference, Houston, TX, 1995. 

Polymer type Polyolefins Polyolefins, olefin based TPE s, flexible PVC, polyesterether TPE, polyurethanes, natural rubber latex, and natural rubber compounds... 

Polybutadiene Isoprene rubber Polypropylene Polyolefins Polyolefins... 

Alt. styrene-co-maleic anhydride grafted polyolefins Polyolefin waxes Urfited States 3,883,458 1975 BASF A.G. 

Surface grafted polyolefins Polyolefin Japan 78,244 1973 Showa Denko... 

So far, the tacticity effect on polymer mixtures has been investigated mainly for the special systems where hydrogen bonding interaction is dominant, such as poly (vinyl chloride)/poly(methyl metacrylate) (PVC/PMMA) [1] or poly-styrene/poly(vinyl methyl ether) (PS/PVME) [2] mixtures. However, recently, there has been an interest in the effect of tacticity on polymer mixtures without specific interaction such as polyolefin/polyolefin [3] or polystyrene/ deuterated polystyrene mixtures [4,5]. 

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