二甲基含氢硅油是制备二甲基硅橡胶不可缺少的原料,其性能对硅橡胶性能有较大影响.针对二甲基含氢硅油传统制备方法存在的缺点,本文中采用高活性、便于处理、能重复利用、低腐蚀性的稀土固体超强酸SO42-/TiO2/Ln3+催化八甲基环四硅氧烷(D4)与1,3,5,7-四氢-1,3,5,7-四甲基环四硅氧烷(D4H)开环共聚合,制备了二甲基含氢硅油.系统考察了共聚合反应的规律,并探索了所得产物在加成型硅橡胶制备中的应用.结果表明,用SO42-/TiO2/Nd3+做催化剂,[SO42-]=1.85 mol/L,[Nd3+]=0.05 mol/L时,在80℃聚合60 min,获得的二甲基含氢硅油收率为87.9%,相对分子质量为4.23×104,相对分子质量分布指数为3.07.当单体按照D4H/(D4H+ D4)=30%,共聚单体与封端剂摩尔比为178.5∶1时,所得硅橡胶性能最佳.
参考文献
[1] | Wang JC;Chen YH;Jin QQ .Organic montmorillonite as a substitute for aerosilica in addition-type liquid silicone rubber systems[J].Macromolecular chemistry and physics,2005(24):2512-2520. |
[2] | Joon-Soo Kim;Seung Cheol Yang;Seung-Yeon Kwak .High performance encapsulant for light-emitting diodes (LEDs) by a sol-gel derived hydrogen siloxane hybrid[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2012(16):7954-7960. |
[3] | Joon-Soo Kim;SeungCheol Yang;Byeong-Soo Bae .Thermally Stable Transparent Sol-Gel Based Siloxane Hybrid Material with High Refractive Index for Light Emitting Diode (LED) Encapsulation[J].Chemistry of Materials: A Publication of the American Chemistry Society,2010(11):3549-3555. |
[4] | Bashim Yactine;Amedee Ratsimihety;Francois Ganachaud .Do-it-yourself functionalized silicones part 2: synthesis by ring opening polymerization of commercial cyclosiloxanes[J].Polymers for advanced technologies,2010(2):139-149. |
[5] | 张弛,李杰,罗运军,李晓萌,葛震.3,3'-双叠氮甲基环氧丁烷-3-叠氮甲基-3'-甲基环氧丁烷无规共聚物的合成与结构表征[J].高等学校化学学报,2011(11):2685-2690. |
[6] | Benjaram M. Reddy;Gunugunuri K. Reddy;Komateedi N. Rao .Influence of alumina and titania on the structure and catalytic properties of sulfated zirconia: Beckmann rearrangement[J].Journal of molecular catalysis, A. Chemical,2009(1/2):62-68. |
[7] | Weishi Li;Zhiquan Shen;Yifeng Zhang .Activity and mechanism of rare earth solid superacid for initiating ring-opening polymerization of chloromethyl thiirane[J].European Polymer Journal,2001(6):1185-1190. |
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%