Chinese Academy of Sciences

Dongtao Liu

Dongmei Cui

Xinli Liu

Shihui Li

Bo Tong Liu

Lingfang Wang

Chunji Wu

Zichuan Wang

Zhichao Zhang

Wei Gao

Compared to the prior art, this invention provides a functionalized highly syndiotactic polystyrene, comprising a repeating unit having a structure represented by formula (I), or comprising a repeating unit having a structure represented by formula (I) and a repeating unit having a structure represented by formula (II). It is indicated by the experimental results that the syndiotacticity selectivity of the highly syndiotactic polymer provided by this invention is no less than 90%, and the proportion of the repeating unit having a structure represented by formula (I) in the polymer may be arbitrarily adjusted and may be up to 100%. Meanwhile, the oxygen- or sulfur-containing groups in the polymer may increase the polarity of the highly syndiotactic polystyrene so as to increase the blendability of the highly syndiotactic polystyrene with other polymers. 

Functionalized highly syndiotactic polystyrene and preparation method thereof

The invention provides a metal alkoxide complex of Formula (I), wherein X, M, R1, R2, R3, m, n, y and z are as defined in the Description. The invention also provides a catalyst composition comprising the metal alkoxide complex and a hydroxy-containing compound, wherein the molar ratio of the metal alkoxide complex to the hydroxy-containing compound is 1:0.1-1000. The invention also provides a production method of poly-&#x3b5;-caprolactone or polyactide, wherein an &#x3b5;-caprolactone monomer or a lactide monomer is reacted in the presence of the metal alkoxide complex or catalyst composition to obtain poly-&#x3b5;-caprolactone or polylactide. The metal alkoxide complex and the catalyst composition thereof can be used to catalyze the synthesis of poly-&#x3b5;-caprolactone or polylactide with a high efficiency. The molecular weight of polycaprolactone or polylactide can be controlled by the molar ratio of the metal alkoxide complex and the hydroxy-containing compound, and is adjustable in the range of 1000-600,000, and wherein the molecular weight distribution is from 1.03 to 1.50.[XM(OCRRR)].(organic solvent)&#x2003;&#x2003;(I)

Metal alkoxide complex, catalyst composition, and production method of polycaprolactone or polylactide

An isoprene or butadiene cis 1,4-selective polymerization catalyst system together with its polymerization method is provided. This catalyst system is composed of NCN-imine pincer type rare earth metal complex of formula [2,6-(CH&#x2550;N&#x2014;R)-4-R-1-CH]LnX(THF)and alkylating reagent. In an hydrocarbon solvent or under bulk conditions, at a polymerization temperature in a range of &#x2212;20-120&#xb0; C., the conjugated diene is polymerized by using the catalyst system, to produce polyisoprene and polybutadiene having controllable number-average molecular weight, molecular weight distribution of 3.0 or less than, and cis 1,4-content of 95% or more, even 99% or more. The crude rubber and vulcanized rubber of the polyisoprene have high strength, stretching crystallization capability and transparency.

Bi-component catalyst system for isoprene or butadiene cis 1, 4-polymerization and polymerization process

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Changchun, China

Dongtao Liu