PAMAM-COOH的合成、表征及对超细纤维合成革卫生性能的影响

摘要

分别采用盐酸和乙醛酸对0．5代聚酰胺-胺(G0．5 PAMAM)和1代聚酰胺-胺(G1 PAMAM)进行改性,得到了0．5代端羧基的树枝状大分子(G0．5 PAMAM-COOH)和1．0代端羧基的树枝状大分子(G1 PAMAM-COOH).采用单因素实验优化了乙醛酸改性 G1 PAMAM 的反应条件,即n(G1 PAMAM)∶n (乙醛酸)为1∶12,反应温度为35℃,反应时间为2 h.采用G0．5 PAMAM-COOH和G1 PAMAM-COOH 对超细纤维合成革基布进行改性,结果表明,改性后基布的透水汽性分别提高了26．97％和34．59％.SEM 显示改性后基布纤维松散程度增加,孔隙变大.水接触角测试表明改性后基布上的亲水基团增多,经 G0．5 PAMAM-COOH 与 G1 PAMMA-COOH 改性的基布,其渗水时间较之未改性基布分别缩短了71．74％和78．26％,表明超细纤维合成革基布的卫生性能得到改善.%G0.5 PAMAM-COOH and G1 PAMAM-COOH were prepared by modifying G0.5 PAMAM and G1 PAMAM with hydrochloric acid and aldehyde acid respectively.The modifying conditions of G1 PAMAM with glyoxalic acid were optimized by single-factor experiment.The n(G1 PAMAM)∶n(aldehyde acid)was 1∶12, the reaction temperature was 35 ℃ and the reaction time was 2 h.The G0.5 PAMAM-COOH and G1 PAM-AM-COOH were used to modify polyamide microfiber synthetic leather base.The results showed that the wa-ter vapor permeability of microfiber synthetic leather base increased by 26.97% and 34.59%.The SEM images of the modified base showed that the microfiber became loose and the pore became big.The water contact angle test revealed that the hydrophilic groups increased.Compared to unmodified base,the water penetration time of bases modified by G0.5 PAMAM-COOH and G1 PAMAM-COOH shortened by 71.74% and 78.26%.These showed that the sanitary properties of microfiber synthetic leather were greatly improved.