The terpolymer of neodymium‐catalyzed styrene, isoprene, and butadiene: Efficient synthesis of integral rubber containing atactic styrene–styrene sequences and high Cis‐1, 4 polyconjugated olefins. Issue 8 (24th August 2013)

• Record Type: Journal Article
• Authors: Xu, Qiang; Li, Li; Guo, Fang; Shi, Zhenghai; Ma, Hongwei; Wang, Yanshai; Wang, Yurong; Li, Yang
• Is Part Of: Polymer engineering & science. Volume 54:Issue 8(2014:Aug.)
• Page Start: 1858
• Page End: 1863
• Publication Date: 2013-08-24
• Subjects: Polymer engineering -- Periodicals; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pen.23731
• Languages: English
• ISSNs: 0032-3888

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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 <italic>atactic</italic> St–St sequences and high <italic>cis</italic>‐1, 4 polyconjugated olefins in macromolecular chains besides controllable composition. The composition of the St–Ip–Bd terpolymers and molecular weight (<italic>M</italic><sub>w</sub>), molecular weight distribution (<italic>M</italic><sub>w</sub>/<italic>M</italic><sub>n</sub>) 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<sup>−3</sup> to 5.0 × 10<sup>−4</sup>, the molecular weight increased from 1.3 × 10<sup>4</sup> to 2.7 × 10<sup>4</sup>. According to the proton nuclear magnetic resonance (<sup>1</sup>H‐NMR) and <sup>13</sup>C‐NMR, it was proved that both microstructures of polybutadiene segments and polyisoprene segments were high <italic>cis‐</italic>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</p> </abstract>