Influence of vinyl bonds from PDMS on the pore structure of polymer derived ceramics
Influence of vinyl bonds from PDMS on the pore structure of polymer derived ceramics
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DOI：
10.1016/j.matchemphys.2018.01.078
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发表时间：
2018-04-15
影响因子：
4.6
通讯作者：
Lu, Kathy
中科院分区：
文献类型：
--
作者：
Erb, Donald;Lu, Kathy
研究了乙烯基键对具有相同分子量的饱和 PDMS (s-PDMS) 和不饱和聚(二甲基硅氧烷-共聚-乙烯基-甲基硅氧烷) (v-PDMS) 聚二甲基硅氧烷 (PDMS) 相分离和分解的影响，并研究了两种基础聚合物体系所得的孔径大小，一种具有过量氢键（PHMS，聚氢甲基硅氧烷），一种具有化学计量氢键与乙烯基键（PSO，聚硅氧烷）。对于 PHMS，具有 s-PDMS 的样品具有较低的陶瓷产率和较高的总孔隙率，而具有 v-PDMS 的样品由于氢和乙烯基之间的广泛氢化硅烷化，在热解至 1300 摄氏度后几乎没有孔隙率。对于 PSO，s-PDMS 和 v-PDMS 都会产生微米级的孔，但 v-PDMS 会产生比 s-PDMS 更小的孔，且尺寸分布更窄。讨论了由于在 PDMS 链上添加乙烯基键而引起的聚合物相分离和分解的根本差异以及基础聚合物氢含量的影响。 (C) 2018 Elsevier B.V. 保留所有权利。
The influence of vinyl bonds on the phase separation and decomposition of polydimethylsiloxane (PDMS) was investigated for a saturated PDMS (s-PDMS) and an unsaturated poly(dimethylsiloxane-co-vinyl-methylsiloxane) (v-PDMS) with the same molecular weight, and the resulting pore sizes were investigated for two base polymer systems, one with an excess of hydrogen bonds (PHMS, polyhydromethylsoloxane) and one with stoichiometric hydrogen to vinyl bonds (PSO, polysiloxane). For PHMS, the samples with s-PDMS have lower ceramic yield and higher total porosity, while the samples with v-PDMS contain nearly no porosity after pyrolysis to 1300 degrees C due to extensive hydrosilylation between the hydrogen and vinyl groups. For the PSO, both s-PDMS and v-PDMS produce micron-sized pores, but the v-PDMS produces smaller pores with a narrower size distribution than the s-PDMS. The fundamental differences in the polymer phase separation and decomposition arising from the addition of vinyl bonds to the PDMS chains and the effect of the base polymer hydrogen content are discussed. (C) 2018 Elsevier B.V. All rights reserved.