目的 为改善包装用传统聚氨酯胶黏剂耐低温性能差的问题,合成具有稳定Si—C键连接的非水解型ABA嵌段有机硅改性聚醚。方法 本研究以聚甲基氢硅氧烷和含末端不饱和C=C双键的甲基烯丙基聚醚为原料,以氯铂酸作为催化剂,进行硅氢加成反应。结果 通过1H NMR、13C NMR、29Si NMR、FT-IR及GPC对产物进行结构表征,成功合成了一系列双羟基封端的聚醚-聚二甲基硅氧烷-聚醚（PE-PDMS-PE）ABA三嵌段低聚物,其结构特征：以聚二甲基硅氧烷（PDMS）链段为疏水中心嵌段（B）,两端连接甲基烯丙基聚醚嵌段（A）,聚合物链两端含有活性羟基（—OH）。结论 通过化学键桥接亲水性聚醚链段（A嵌段）与疏水性PDMS链段（B嵌段）,能够合成具有优异的水解稳定性Si—C键连接的非水解型ABA嵌段低聚物。
Abstract
To improve the poor low-temperature resistance in traditional polyurethane adhesives for packaging, the work aims to synthesize a non-hydrolytic ABA block organosilicone-modified polyether with stable Si—C bonds. With polymethylhydrosiloxane and methylallyl polyether containing terminal unsaturated C=C double bonds as raw materials and chloroplatinic acid as the catalyst, a series of bis-hydroxyl-terminated polyether-polydimethylsiloxane-polyether (PE-PDMS-PE) ABA triblock oligomers were successfully synthesized through silane-hydrogen addition reactions and structurally characterized by ¹H NMR, 13C NMR, 29Si NMR, FT-IR, and GPC. Its structural features included a hydrophobic central block (B) composed of polydimethylsiloxane (PDMS), two methylallyl polyether blocks (A) at both ends, and active hydroxyl groups (—OH) present at both termini of the polymer chains. Hydrolytically stable non-hydrolytic ABA block organosilicone-modified polyether with Si—C bonds can be synthesized by chemically bridging hydrophilic polyether blocks (A) with hydrophobic PDMS blocks (B) via covalent bonds.
关键词
聚醚 /
聚二甲基硅氧烷 /
三嵌段低聚物 /
耐低温性
Key words
polyether /
polydimethylsiloxane /
triblock oligomer /
low-temperature resistance
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