摘要
以聚乙烯乙烯醇为主链,利用其羟基的反应活性,通过Williamson反应将短链的聚乙二醇结构引入聚乙烯-乙烯醇主链上,并通过磺酸丙内酯开环反应对其侧链进行磺化,制备出一种主链为疏水的聚乙烯链段,侧链为(—CH2CH2O—)重复单元,且侧链末端为磺酸氢的梳形单离子聚合物.采用红外光谱分析法证实了氯代缩乙二醇被接枝到EVOH主链上以及—SO3—基团的存在;采用示差扫描量热法(DSC)和热重分析法(TG)对其热学性能进行了表征.DSC分析表明随着侧链长度的增加,主链和侧链的玻璃化转变温度均向低温方向移动;而TG分析显示EVOH-g-nSPEG的热失重曲线有两个失重台阶,并且在第一个失重台阶出现之前还出现了缔合水的失重,该离聚物的起始的热分解温度仍高于200℃.
The backbone of poly （ ethylene - co - vinyl alcohol） （EVOH） has been grafted by poly （ethylene glycol） （PEG） through the Williamson reaction and the sulfonic groups have been introduced on the end of PEG side chain by the open ring reaction with 1,3 - propane suhone for the reaction activity of hydroxyl group in the EVOH. The backbone of the comb single ion polymer is hydrophobic polyethylene segments and the side chain is hydrophilic PEG segment with the sulfonic group at its end. The polymer was characterized with FITR. It showed that the diglycol/triethylene-glycol was grafted on the backbone of poly （ethylene- co -vinyl alcohol） （EVOH） and sulfonic group is at the end of the side chain. The thermal properties were examined by DSC and TG. The analysis of DSC showed that with the increasing of side chains length the glass transition temperature of the ion polymer moved to low temperature. The TG analysis showed that there were two weightlessness stages, and the weight loss of the bonded water might happen before the first stage, its decomposition temperature onset was higher than 200 ℃.
出处
《哈尔滨商业大学学报（自然科学版）》
CAS
2007年第3期273-276,共4页
Journal of Harbin University of Commerce：Natural Sciences Edition
基金
黑龙江省青年基金(QC04C08)
黑龙江省教育厅科学技术研究(10551078)
