Polypropylene-polyethylene copolymer

Kontopoulou, M. Bisaria, M. Vlachopoulos, J. An experimental study of rotational molding of polypropylene/polyethylene copolymer. Int. Polym. Process. 1997,12, 165-173. 

Polypropylene/polyethylene copolymer 23.6 6 dichloro-p-xylylene) 25 tm film 275 6... 

Hagman and co-workers [3] and Schmidt and co-workers [4] used dynamic headspace analysis to study volatiles in polypropylene-polyethylene copolymers and PVC and polyethylene terephthalate. In the latter method [3], volatiles from PET and PVC were collected and separated by open tubular GC. Other solid polymer headspace methods discussed include hexane, tridicane and butylated hydroxytoluene in polypropylene [5], vinyl chloride, vinyl acetate, acetaldehyde and water in vinyl and acrylic polymers and polyolefins [6], ethyl acetate and toluene in laminated polyolefins [7], miscellaneous volatiles in polymers [8] and solvents retained in plastic films [9-12]. 

Polyethylene, high-density Polypropylene/polyethylene copolymer Embedding Compounds Basic epoxy resin bisphenol-A/epichlorohydrin polycondensate Cycloaliphatic epoxy alicyclic diepoxy carboxylate Polyetherketone Polyurethanes... 

Figure 6.2. Pyrolysis - gas chromatography of (a) polyethylene (b) polypropylene - polyethylene copolymer.

The NMR spectrum for a polypropylene-polyethylene copolymer is shown in Figure 1. The spectrum was obtained at 90 °C in a solution of ortho-dichlorobenzene. The major peaks at 21, 27 and 46 ppm are due to the polypropylene, with the other, minor peaks being due to polyethylene. 

FTIR SPECTROPHOTOMETRY FOR THE DETECTION OF MICROSTRUCTURAL CHANGES IN A POLYPROPYLENE/ POLYETHYLENE COPOLYMER CAUSED BY ARTIFICIAL AGEING Romeu J Pages P Carrasco F Cataluna,Universidad Politecnica Girona,Universidad... 

Poly(ethylene-copolymer poly(ethylene-propylene) polypro, polypropylene-polyethylene copolymer 9010-79-1 1 -Propene, polymer with ethene R (C3H6C2H4),... 

Uses. Stabilizer/antioxidant for vinyl plastics and polyethylene, polypropylene, styrene copolymers, and rubber... 

Effect of Substrate. Again, polyethylene and ethylene-propylene copolymers are better substrates for block formation than polypropylene (Table XI). Polyethylene is better than polypropylene, and a polyethylene-polypropylene-polyethylene type of block polymer is better than polyethylene. This agrees with what has been found for AFR polymers containing methylvinylpyridine and acrylonitrile. It also supports our belief that AFR polymers are formed by the growing of a free radical polymer onto active ends of anionic polymer chains. If it were a random grafting reaction, it would be hard to explain why a propylene polymer with a more vulnerable tertiary hydrogen should give a lower... 

Used as an antioxidant and thermostabilizer for polypropylene, polyethylene, impact resistant polystyrene, poly-4-methyl-pentene. Can be used as a stabilizer for natural and synthetic rubber, polyvinyl chloride. A copolymer of acrylonitrile with butadiene and styrene, polyacetals, alkyde resins, polyamides and polyesters. 

Amorphous polymers or regions of polymers can be regarded as micro-porous materials, and can be studied, therefore, by monitoring the Xe chemical shifts of adsorbed xenon gas. Mansfeld et al. [94] used this method to distinguish between incompatible blends (of polypropylene with a poly-propylene/polyethylene copolymer) and compatible blends (PMMA and PVDF). In the former case, two Xe signals were observed, whereas only... 

A review article by Bicerano [64] delves into the phenomenology of polymer crystallization in far greater detail including the trends for Tm and for the other crystallization parameters of homopolymers and copolymers, as well as the trends and some of the models for the kinetics of crystallization. Polypropylene, polyethylene terephthalate), and copolymers of propylene and of ethylene terephthalate, are all given detailed consideration as case studies. 

In addition to, or instead of, polystyrene and oils, polymers such as polypropylene, polyethylene, or ethylene-vinyl acetate copolymer can be blended with these block copolymers. Blends with S-B-S or (S-B) -X block polymers usually show greatly improved ozone resistance (S-EB-S already has excellent ozone resistance). In addition, these blends have some solvent resistance. In certain cases, some oils that are stable to UV radiation reduce the stability of the blends however, the effects can be minimized by the use of UV stabilizers and absorptive or reflective pigments (e.g., carbon black or titanium dioxide). 

U.S. Pat. Nos. 6,344,504 [102] and 6,498,205 [103] (both by Crane Plastics Company, TimberTech) disclose a thermoplastic-based composite, comprising at least 16% by weight of a powdered thermoplastic material, at least 50% by weight of cellulosic material, and a lubricant, a phenolic resin, and a compound containing one or more isocyanate groups, each of at least 1% by weight. A powdered thermoplastic material comprises polyethylene, LDPE, polypropylene, ethyl-vinyl acetate (EVA), and polyethylene copolymers. 

Figure 2.9. Temperature dependence of the binary interaction parameter, X12 blends of deuterated amorphous polypropylene (either head-to-tail or head-to-head, hh) with polyethylene copolymers. The values were determined by SANS. Data [Graessley etal, 1995].

Foams can be made with both thermoplastic and thermosetting plastics. The well known commercial thermoplastic foams are polystyrene, PVC, polyethylene, polypropylene, ABS copolymer, cellulose acetate. The thermosetting plastics which may be mentioned, among others, are phenol-formaldehyde, urea-formaldehyde, polyurethane, epoxy, and silicone. The methods of manufacture of some of these polymeric foams are given below. 

Examples of such compatibilized systems that have been studied include EPDM/PMMA blends compatibilized with EPDM- -MMA, polypropylene/polyethylene blends with EPM or EPDM, polystyrene/nylon-6 blends with polystyrene/nylon-6 block copolymer, and poly(styrene-co-acrylonitrile)/poly(styrene-co-butadiene) blends with butadiene rubber/PMMA block copolymer. 

The ebonite battery case was replaced by polypropylene and polyethylene copolymer or by acrylonitrile butadiene styrene. 

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