Novel elastomeric A-B-A triblock copolymers were successfully synthesized in a new two-step process: controlled ring-opening polymerization of the cyclic etherester 1,5-dioxepan-2-one as the amorphous middle block (B-block) followed by addition and polymerization of the two semicrystalline L-lactide
On the polymerization of 2-isopropenylnaphthalene—5. Di- and triblock copolymers with 1,3-butadiene
✍ Scribed by D. Engel; R.C. Schulz
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 523 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0014-3057
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## Abstract The additive effect of triphenylphosphine (Ph~3~P) was investigated in 1,3‐butadiene polymerization with cobalt dichloride (CoCl~2~) activated by methylaluminoxane (MAO); the catalytic system resulted in slowly‐initiated living polymerization with a high __cis__‐1,4 content (about 99%)
The main kinetic laws governing 4-methylpentene-I (MP) polymerization and copolymerization with propylene (P) on the catalytic system TiCI 3 + (C2Hs)gAIC1 between 30 and 70 ° were studied. The MP homopolymerization is kinetically first-order in monomer and TiCl> The effective activation energy is 8'