以1,4-双(二甲基硅基)苯、二甲基二甲氧基硅烷和甲基乙烯基二甲氧基硅烷为原料,用Si-H/Si-OR缩聚的方法制备了一系列聚(四甲基对硅亚苯基-二甲基-甲基乙烯基)硅氧烷三元共聚物(PTMPS/DMS/VMS),并用TG与DSC对共聚物的热性质进行了表征.结果表明,乙烯基能显著提高PTMPS/DMS/VMS在氮气中的热稳定性,且当DMS/VMS为50:50(摩尔比)时热稳定性最好.在空气中,引入乙烯基同样能提高PTMPS/DMS/VMS的热稳定性,但其影响比氮气中小得多.PTMPS/DMS/VMS的Tg与VMS链节含量的关系为:Tg=-56.1-0.04[VMS%],Tg随共聚物中VMS链节含量的增加而线性降低,但降低的幅度很小(不超过4.3℃).
参考文献
| [1] | Liu Y;Imae I;Kawakami Y .Novel thermally resistant polysilphenylenesiloxanes with a high content of vinyl substituents[J].Polymer International,2004,53:1259. |
| [2] | Yang Liu;Ichiro Imae;Akio Makishima;Yusuke Kawakami .Synthesis and characterization of poly(silphenylenesiloxane)s containing functional side groups, a study to high-temperature elastomer[J].Science and technology of advanced materials,2003(1):27-34. |
| [3] | Zhu HD.;MacKnight WJ.;Kantor SW. .Thermally stable silphenylene vinyl siloxane elastomers and their blends[J].Macromolecules,1998(3):850-856. |
| [4] | Rubinsztajn S;Celia J A .A new polyeondensation process for the preparation of polysiloxane copolymers[J].Macromolecules,2005,38:1061. |
| [5] | Julian Chojnowski;Slawomir Rubinsztajn;James A.Cella;Witold Fortuniak;Marek Cypryk .Mechanism of the B(C_6F_5)_3-Catalyzed Reaction of Silyl Hydrides with Alkoxysilanes.Kinetic and Spectroscopic Studies[J].Organometallics,2005(25):6077-6084. |
| [6] | Xunjun C;Yingde C;Guoqiang Y;Liewen L .Synthesis of vinyl substitute poly(silphenylene-siloxane) via silyl hydride-dialkoxysilane process[J].Journal of Applied Polymer Science,2007(2):1007-1013. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%