碳硼烷甲基丙烯酸酯接枝改性真丝研究

Graft modification on silk with carborane Methacrylate

以甲基丙烯酸(碳硼烷甲氧乙基)酯为接枝单体,通过自由基乳液接枝处理真丝,在真丝丝素大分子上引入聚甲基丙烯酸(碳硼烷甲氧乙基)酯接枝链。以正交试验方案优选接枝改性工艺条件,得到的最优化工艺条件为:单体质量分数为2.6%、引发剂用量占单体质量分数5%、在pH3的情况下反应100 min。以红外光谱和扫描电镜对接枝前后的真丝进行了结构表征,利用热分析研究了接枝前后真丝的热失重行为。结果表明,接枝处理后真丝耐热性能改善,当接枝率为21.1%时,温度达到300℃时质量保留率为92.2%,高于未处理真丝保留率为89.0%。

Using 1-Carborano-Methoxyethyl Methacrylate as material, graft modification on silk fiber was studied via emulsion radical graft polymerization. The side chains of poly（1-Carborano-Methoxyethyl Methacrylate） were grafted on the silk fibroin macromolecules. The reaction conditions of graft copolymerization were optimized by orthogonal scheme and the optimum processing conditions was achieved to be： content of monomer in the emulsion was 2.6 %, initiator was 5 %, and the graft polymerization was kept for 100rain at the pH value of 3. The structure of the silk fiber before and after modification was characterized by FI-TR and SEM, and thermal decomposition behavior of silk was identified by thermal analysis technology. The TG result showed that the heat-resistance of grafted silk was improved, when the graft degree up to 21.1%, the mass retention of treated silk was 92,2 % under 300℃, which is higher than the 89.0 % of untreated sample.