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- W2502796586 abstract "Using organolithiums or complexes of diorganomagnesiums with trialkylaluminums, in combination with specific barium salts, we are able to control the trans-1,4/cis-1,4 ratio in butadiene-styrene copolymers, while still maintaining a low vinyl content. The important reaction variables for doing this are the barium/metal alkyl ratio, polymerization temperature, and initiator concentration. For SBR's prepared with Ba-Mg-Al initiators in comparison to barium modified alkyllithiums, the trans-1,4 content is higher (87% vs. 79%) and the vinyl content is lower (3% vs. 8%). Moreover, the Ba-Mg-Al initiator system has the characteristics of a living polymerization providing control of average molecular weight, molecular weight distribution, and molecular architecture. The crystalline melting temperature of these trans-1,4 polybutadienes can be decreased to near room temperature by adjustment of the trans-1,4 content and/or the incorporation of styrene. Their crystallization behavior compares with natural rubber, as follows: (1) their rate of crystallization is more rapid; and (2) their amount of crystallinity is temperature dependent, but considerably less strain dependent. These experimental rubbers have excellent green strength and building tack." @default.
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- W2502796586 date "1982-07-19" @default.
- W2502796586 modified "2023-10-14" @default.
- W2502796586 title "Synthesis and Properties of Diene Elastomers With Controlled Structure" @default.
- W2502796586 doi "https://doi.org/10.1021/bk-1982-0193.ch004" @default.
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