检索结果-南通市图书馆

One-Pot terpolymerization of CO2, Propylene Oxide and Lac- tide Using Rare-earth Ternary Catalyst

Chinese Journal of Chemistry 2012年第9期30卷 2121-2125页

作者：顾林秦玉升高永刚王献红王佛松 Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of ScienceChangchunJilin 130022China Graduate University of Chinese Academy of Sciences Beijing 100039China

A convenient one-pot terpolymerization of CO2, propylene oxide （PO）, and L-lactide （L-LA） in short polymerization time （10 h or shorter） to afford poly（propylene carbonate-lactide） with excellent mechanical property and thermal stability using Y（CCl3COO）3-ZnEtz-glycerin rare-earth ternary catalyst is reported. The yield of the co- polymerization was between 69.7 and 111.7 g/（g Zn）, corresponding to L-LA/PO molar feed ratio varying from 0 to 0.1, and the number average molecular weight was between 5.5×10^4 and 11.9 × 10^4. The L-LA content in the ter- polymer increased from 1.1% to 34.7% when L-LA/PO molar feed ratio changed from 0.01 to 0.1. Introducing L-LA as the third comonomer could significantly improve the mechanical strength and thermal stability of PPC. For the terpolymer obtained from L-LA/PO molar feed ratio of 1：50, the elongation at break reached 40.5%, which is 3 times of that of pure PPC, and the thermal decomposition temperature increased by 32℃ compared with pure PPC.

关键词： carbon dioxide propylene oxide L-lactide terpolymerization

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Mixed Dispersants on Suppression of the Gel Effect during Aqueous Adiabatic terpolymerization of AM,NaAA,and DMC

引用

中国炼油与石油化工:英文版 2023年第3期25卷 83-91页

作者： Yang Junfeng Zhou Manli Wang Meng Qingyuan Yakoo Chemical Co. LtdQingyuan 510640China Department of Polymer Science and Engineering South China University of TechnologyGuangzhou 510640China

Gelation adversely affects the aqueous adiabatic terpolymerization of acrylamide (AM), sodium acrylate (NaAA),and 2-methacryloyloxyethyl trimethylammonium chloride (DMC). Here, the mixed dispersants sorbitan monooleate (Span80) and polyoxyethylene sorbitan monooleate (Tween 80) were introduced to the terpolymerization system in an attemptto mitigate the gel effect. This enabled the preparation of high-performance amphoteric polyacrylamides, which werecharacterized by Fourier-transform infrared spectroscopy and thermogravimetric analysis. The influences of the dispersanttype and content as well as the hydrophilic-lipophilic balance (HLB) on the gel effect were examined, and the mechanismunderlying the suppression of the gel effect was considered. The obtained results indicated that the gel effect can beeffectively mitigated using an aqueous adiabatic terpolymerization system containing mixed Span 80/Tween 80 dispersantsat various contents. In particular, mixed dispersant contents of 0.6%–0.8% with HLB values of 5.0–6.0 afforded the optimalperformance (e.g., high viscosity, fast aqueous dissolution time, and the like).

关键词： gel effect dispersants amphoteric polyacrylamide terpolymerization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SYNTHESIS AND CHARACTERIZATION OF HIGH MOLECULAR WEIGHT POLY(1,2-PROPYLENE CARBONATE-co-1,2-CYCLOHEXYLENE CARBONATE) USING ZINC COMPLEX CATALYST

引用

Chinese Journal of Polymer Science 2011年第5期29卷 552-559页

作者：肖敏孟跃中 The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen University

Using supported multi-componem zinc dicarboxylate catalyst, poly（1,2-propylene carbonate-co-1,2-cyclohexylene carbonate）（PPCHC） was successfully synthesized from carbon dioxide （CO2） with propylene oxide （PO） and cyclohexene oxide （CHO）. The conversion of epoxides dramatically increased up to 89.7% （yield： 384.2 g of polymer per g of Zn） with increasing reaction temperature from 60℃ to 80℃. The optimized reaction temperature is 80℃. The chemical structure, the molecular weight, as well as thermal and mechanical properties of the resulting terpolymers were investigated extensively. When CHO feed content （mol%） is lower than 10%, the PPCHC terpolymers have number average molecular weight （Ma） ranging from 102 × 10^3 to 202 × 10^3 and molecular weight distribution （MWD） values ranging from 2.8 to 3.5. In contrast to poly（propylene carbonate）（PPC）, the introduction of small amount of CHO leads to increase in the glass transition temperature from 38.0℃ to 42.6℃. Similarly, the mechanical strength of the synthesized terpolymer is greatly enhanced due to the incorporation of CHO. These improvements in mechanical and thermal properties are of importance for the practical application of PPC.

关键词： Carbon dioxide Cyclohexene oxide Catalysis terpolymerization Propylene oxide.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and properties of novel aliphatic polycarbonate from carbon dioxide with 1,2-butylene oxide and ε-caprolactone

引用

Chinese Chemical Letters 2007年第2期18卷 209-212页

作者： Yan Fei Liu, Ke Long Huang , Dong Ming Peng, Su Qin Liu, Hong Wu Institute of Functional Materials and Chemistry, Central South University, Changsha 410083, China Institute of Functional Materials and Chemistry Central South UniversityChangsha 410083China

A new degradable aliphatic poly(butylene-co-e-caprolactone carbonate) (PBCL) was synthesized through the terpolymerization of carbon dioxide, 1,2-butylene oxide (BO) and e-caprolactone (CL), a polymer supported bimetallic complex (PBM) was used as a catalyst. The terpolymers prepared were characterized by FT-IR,1H NMR, 13C NMR, WXRD and DSC. The hydrolysis tests were carried out to appraise the degradability of the copolymers.

关键词： terpolymerization Aliphatic polycarbonate Degradability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：