Kalinin Alexei V, Zuev Vjacheslav V
S.V. Lebedev State Institute of Synthetic Rubber, 1, Gapsalskaya St. 1, 198035 Saint Petersburg, Russia.
Chemical Engineering Centrum, ITMO University, Kronverkskiy Pr. 49, 197101 Saint Petersburg, Russia.
Materials (Basel). 2023 Apr 13;16(8):3072. doi: 10.3390/ma16083072.
We suggest a new method for postsynthesis modification of silicones containing silanol groups. It was found that trimethylborate is an effective catalyst for dehydrative condensation of silanol groups with the formation of ladder-like blocks. The utility of this approach was demonstrated on postsynthesis modification of poly-( poly(dimethylsiloxane)- ladder-like poly(phenylsiloxane)) and poly-( poly((3,3',3″-trifluoropropyl-methyl)siloxane)- ladder-like poly(phenylsiloxane) with a combination of linear and ladder-like blocks having silanol groups. The postsynthesis modification leads to a 75% increase in tensile strength and 116% elongation on break in comparison with the starting polymer.
我们提出了一种对含硅醇基的有机硅进行合成后改性的新方法。发现硼酸三甲酯是硅醇基脱水缩合形成梯状嵌段的有效催化剂。该方法的实用性通过对聚（聚二甲基硅氧烷 - 梯状聚苯基硅氧烷）和聚（聚（3,3',3″ - 三氟丙基 - 甲基）硅氧烷 - 梯状聚苯基硅氧烷）进行合成后改性得以证明，这些聚合物具有含硅醇基的线性和梯状嵌段的组合。与起始聚合物相比，合成后改性使拉伸强度提高了75%，断裂伸长率提高了116%。
