Poly methyl pentanes

Transparent Polymers. Amorphous thermoplastics, like poly (methyl methacrylate), polystyrene, SAN, PVC, or the cellulose esters are transparent and used for glazing, photographic film, blown bottles, or clear packaging containers. Only a few crystalline thermoplastics, like poly (4-methyl-l-pentane), where the crystalline and the amorphous phases have almost identical refractive indexes, or polycarbonate, which has smaller crystals than the wavelength of light, are also transparent. R. Kosfeld and co-workers analyzed the mobility of methyl groups in polycarbonate, poly (methyl methacrylate) and poly( -methyl styrene) by NMR spectroscopy. 

Fig. 5.6. The dependence of the CFTs (both UCFT and LCFT) upon latex particle concentration for poly(methyl methacrylate) particles stabilized by poly(dimethylsiloxane) dispersion medium 1,2 n-propane 3,4 n-butane 5,6 -pentane (after Everett and Stageman, 1977).

Polymeric Beads, Expandable Polystyrene Beads, Expandable Plastics Moulding Compound A moulding material in bead or granular form consisting predominantly of polystyrene, poly(methyl methacrylate) or other polymeric material and containing 5% to 8% of a volatile hydrocarbon which is predominantly pentane. During storage a small proportion of this pentane is released to the atmosphere this proportion increases at elevated temperatures. IMO 9036... 

Particular studies of the IR spectra of polymers include isotactic poly(l-pentane), poly(4-methyl-l-pentene), and atactic poly(4-methyl-pentene) [18], chlorinated PE [19], aromatic polymers including styrene, terephthalic acid, isophthalic acid [20], PS [21, 22], styrene-glycidyl-p-isopropenylphenyl ether copolymers [23], styrene-isobutylene copolymers [24], vinyl chloride-vinyl acetate-vinyl fluoride terpolymers [25], vinyl chloride-vinyl acetate copolymers [26], styrene copolymers [27], ethylene-vinyl acetate copolymers, graft copolymers, and butadiene-styrene [28] and acrylonitrile-styrene copolymers [29]. 

Fig. 5. Boson peak energy as a function of monomer mass for amorphous polymers and as a function of molecular mass for organic molecular glasses. Amorphous polymers polyethylene (PE) [29], poly(vinyl alcohol) (PVA) [152], cis-1,4-polyhutadiene (PB), polyisobutylene (PIB), frans-1,4-polychloroprene (PCP), atactic polyst ene (PS), atactic poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET) [30, 34], atactic polypropylene (a-PP) [95],polyisoprene with deuteratedmethyl group (PIP-dj) [36],polycarbonate (PC) [91],polyimide (AURUM) [39]. Molecular glasses propylene (P), 1-butene (B), 3-methyl pentane (MP),ortho-terphenyl (OTP),ethylbenzene (EB) [38]...

Smith and coworkers reported the preparation of both particles and fibers via RESS from a variety of polymers (57,68-72,80). For example, a solution of polystyrene (molecular weight about 300,000 and melting point about 170°C) in supercritical pentane was rapidly expanded at 350°C and 170 bar using a 25-p,m nozzle the result was spherical particles with an average diameter of 20 p,m (68). Other polymers, including polypropylene, poly(carbosilane) (an important precursor for silicon carbide), poly(phenylsulfone), poly(methyl methacrylate), and cellulose acetate, were processed into micrometer-sized particles via RESS in a similar fashion (68). However, when the preexpansion temperature of the supercritical pentane solution was lowered from 350°C to 200" C, polystyrene fibers (100-1000 txm in length and 1 ixm in diameter) were obtained. 

Figure 2. IR spectrum of poly(5-methyl-l,4-hexadiene) prepared with a EttAlCl/ h-TiCl3 catalyst at 0°C in pentane solvent. Reproduced, with permission from Ref. 13. Copyright 1979, American Institute of Physics.

According to Ketley (7), who studied the infrared spectra of poly(4-methyl-1-pentene) samples prepared with A1C13, AlBr3, and EtAia2 in n-pentane and ethyl chloride diluent in the range — 78 to —130°, isomerization polymerization increases with decreasing temperature and increasing dielectric constant. 

Poly (styrene-co-acrylonitrile). See Styrene/acrylonitrile copolymer Poly (styrene-co-allyl alcohol). See Styrene/allyl alcohol copolymer Poly (styrene-co-butadiene). See Styrene/butadiene polymer Poly (styrene-co-divinylbenzene). See Styrene/DVB copolymer Poly (styrene-co-maleic anhydride). See Styrene/MA copolymer Poly (styrene-co-methyl methacrylate). See Styrene/methyl methacrylate copolymer Poly (styrene-co-a-methylstyrene). See Styrene/a-methyl styrene resin Poly (styrene-divinylbenzene). See Styrene/DVB copolymer Polystyrene, expandable Synonyms EPS Expandable polystyrene Expanded polystyrene XPS Definition Amorphous PS beads contg. pentane as a blowing agent and coated with a lubricant the polymer is converted to foamed articles with a closed cell structure by applic. of steam Properties Beads (0.4-1.5 mm diam.)... 

Blends of styrenic pol5m ers (PS, high impact poly (styrene)) and biodegradable polymers (PLA) can be extruded and thermo-formed to produce very low density food service and consumer foam articles (29,31). The blends are compatibilized with styrene-based copolymers a styrene-maleic anhydride copol5mier, or a styrene methyl methacrylate copolymer. As blowing agent for foaming the compositions z-pentane is used. 

Poly (4-methyl-1 -pentane) Square-based pyramid... 

FA1 Fang, J. and Kiran, E., Crystalhzation and gelation of isotactic poly(4-methyl-l-pentene) in n-pentane and in n-pentane + CO2 at high pressitres, J. Supercrit. Fluids, 38, 132, 2006. 

Poly(tert-butyl-acrylate) Methyl ethyl ketone Acetone Methanol Pentane... 

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