In:
Polymer Engineering & Science, Wiley, Vol. 54, No. 8 ( 2014-08), p. 1858-1863
Abstract:
The present study focuses on the terpolymer of styrene (St), isoprene (Ip), and butadiene (Bd) synthesized together in cyclohexane at 70°C with neodymium (Nd) compound, alkylaluminum, and chlorinating agent (Cl) rare earth cocatalyst system. The resultants possessed atactic St–St sequences and high cis ‐1,4 polyconjugated olefins in macromolecular chains besides controllable composition. The composition of the St–Ip–Bd terpolymers and molecular weight ( M w ), molecular weight distribution ( M w / M n ) were controlled through the adjustment of Nd compound, alkylalumium, monomers feed ratio (St/Ip/Bd), and [Nd]/[monomers] . With the inventory rating of St raised from 15% to 55%, the content of St in the terpolymers got increased from 2% to 15%. And the content of the Ip segments and Bd segments in the terpolymers increased from 33% to 56% and from 28% to 54%, respectively, with the proportion of Ip/Bd varied from 1/2 to 2/1. As the [Nd]/[monomers] varied from 1.0 × 10 −3 to 5.0 × 10 −4 , the molecular weight increased from 1.3 × 10 4 to 2.7 × 10 4 . According to the proton nuclear magnetic resonance ( 1 H‐NMR) and 13 C‐NMR, it was proved that both microstructures of polybutadiene segments and polyisoprene segments were high cis‐ 1,4‐configuration. A single glass‐transition temperature was observed in the differential scanning calorimetry curve. POLYM. ENG. SCI., 54:1858–1863, 2014. © 2013 Society of Plastics Engineers
Type of Medium:
Online Resource
ISSN:
0032-3888
,
1548-2634
Language:
English
Publisher:
Wiley
Publication Date:
2014
detail.hit.zdb_id:
2006718-5
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