BUTYLENE COPOLYMER

Copolymerization of ethylene and styrene by the INSITE technology from Dow generates a new family of ethylene-styrene interpolymers. Polymers with up to 50-wt% styrene are semicrystalline. The stress-strain behavior of the low-crystallinity polymers at ambient temperature exhibits elastomeric characteristics with low initial modulus, a gradual increase in the slope of the stress-strain curve at the higher strain and the fast instantaneous recovery [67], Similarly, ethylene-butylene copolymers may also be prepared. 

More recently, two-state E/B models have been proposed by Chujo and Doi (9.10) for the analysis of polypropylene. Similar E/B models were proposed by Cheng(11) and Asakura, et al(12) for polybutylene. For copolymers, two-state B/B models have been proposed for ethylene-propylene copolymers,(11,13-15) and propylene-butylene copolymers.(11,13) Recently, Cheng(11) generalized these multi-state models and developed computer methodology for the general analysis of such systems. A number of polymer systems were treated. 

Copolymer sequence analysis follows the same procedure. A computer program (HIXCO.TRIAD) was previously written for the two-state B/B model-fitting of triad sequence distributions and applied to (unfractionated) propylene-butylene copolymers and... 

By rapid expansion of supercritical propane solution (RESS), and isobaric crystallisation (ICSS), isotactic polypropylene and ethylene-butylene copolymers were precipitated from the supercritical solution. The RESS process produced microfibres with a trace of microparticles, while the ICSS process produced microcellular products. Improvement in thermal stability was achieved by first synthesising a thermoplastic vulcanisate from polypropylene and ethylene-propylene-diene terpolymer from a supercritical propane solution, followed by RESS. 28 refs. 

Fig. 32 Master curve of the dynamic melt viscosity (/] ), storage modulus (G ) and loss modulus (G") of a poly(ethylene/butylene) copolymer (Mn = 3500gmol ). Reprinted with permission from [131]...

Thermoplastic polyolefin (TPO) elastomers are typically composed of ethylene propylene rubber (EPR) or ethylene propylene diene M (EPDM) as the elastomeric segment and polypropylene thermoplastic segment. LDPE, HDPE, and LLDPE copolymers ethylene vinyl acetate (EVA), ethylene ethylacrylate (EEA), ethylene, methyl-acrylate (EMA) and polybutene-1 can be used in TPOs. Hydrogenation of polyisoprene can yield ethylene propylene copolymers, and hydrogenation of 1,4- and 1,2-stereoisomers of S-B-S yields ethylene butylene copolymers. ... 

Details are given of the miniemulsion polymerisation of a hydrophobic bifunctional ethylene-butylene copolymer macromonomer. Polymerisation kinetics were examined using potassium persulphate and AIBN. Solubihties of the resultant latex film in toluene, chloroform and THE were investigated. 16 refs. 

The experimental protocol of our studies involved the exposure of fresh healthy platelet-rich plasma (PRP) of young males to 9 pure synthetic polymers, namely polyethylene, ethylene-butylene copolymer, ethylene-propylene copolymer, ethylene-ethylacrylate copolymer, ethylene-vinylacetate copolymer, ethylene-methylmethacrylate sodium ionomer, nylon 12, polyurethane, and tetrafluoroethylene-hexafluoropro-pylene copolymer ( Figure-1). Polymer pellets tested have been especially synthesized under clean conditions and were substances of known composition, free of plasticizers and... 

Styrene-ethylene-butylene copolymer 20 20 Very good... 

Chen, S.-L., Benziger, J.B., Bocarsly, A. B., and Zhang, T. (2005). Photo-cross-linking of sulfonated styiene-ethylene-butylene copolymer membranes for fuel cells. IruL Eng. Chem. Res. 44, 7701. 

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