Synthesis and Characterization of Carboxyl Terminated Polydimethylsiloxanes
Synthesis and Characterization of Carboxyl Terminated Polydimethylsiloxanes
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端羧基聚二甲基硅氧烷的合成与表征
DOI：
10.1080/10601325.2013.850618
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发表时间：
2014-01
影响因子：
2.5
通讯作者：
Lin, Yaling
中科院分区：
文献类型：
--
作者：
Liu, Qiongqiong;Zhang, Anqiang;Yang, Lin;Lin, Yaling
通过开环聚合控制合成了一系列端氢聚二甲基硅氧烷(PDMS-H)。然后，在Speier催化剂的催化下，通过硅氢化反应将甲基丙烯酸甲酯和甲基丙烯酸叔丁酯接枝到聚二甲基硅氧烷上，发现甲基丙烯酸甲酯和甲基丙烯酸叔丁酯的硅氢化加成反应对β-1，2加成反应有较强的选择性，没有观察到α-1，2加成产物和1，4-加成产物。分别在氢氧化钠/乙醇水溶液和酸性条件下，通过后续的水解反应合成了端羧基聚二甲基硅氧烷。两种方法均能成功地合成端羧基聚二甲基硅氧烷。然而，在碱性水解过程中，产物的相对分子质量显著降低，而端基叔丁基聚二甲基硅氧烷的酸解可以在高度可控的方式下进行。此外，只有当聚二甲基硅氧烷的端基是叔丁基时，才能很好地进行酸解反应合成端羧基的聚二甲基硅氧烷，这可以用叔丁基的专一性来解释。
A series of hydrogen terminated polydimethylsiloxanes (PDMS-H) had been controlled synthesized via ring-opening polymerization. Then, methylmethacrylate (MMA) and tert-butyl methacrylate (tBMA) were grafted to PDMS-H via hydrosilylation reactions in the presence of Speier's catalyst, the hydrosilylation addition patterns of MMA and tBMA showed a strong preference toward β-1,2 addition, no α-1,2 addition product or 1,4-addition product was observed. Carboxyl terminated polydimethylsiloxanes were prepared by subsequent hydrolysis reaction in an aqueous NaOH/ethanol solution and under acid condition, respectively. Both methods could obtain carboxyl terminated polydimethylsiloxanes successfully. However, a significant decrease of the molecular weight of products was observed in the alkaline hydrolysis process, while the acid hydrolysis of tertiary butyl ester group terminated polydimethylsiloxanes could be conducted in a highly controlled manner. Besides, the synthesis of carboxyl terminated polydimethylsiloxanes via acid hydrolysis reaction can be conducted well only when the terminal group of polydimethylsiloxanes is tertiary butyl, this can be explained by the specificity of tertiary butyl.
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影响因子：
3.4
作者：
C. W. Lewis
通讯作者：
C. W. Lewis
DOI：
10.1002/marc.1992.030131001
发表时间：
1992-10
期刊：
Die Makromolekulare Chemie, Rapid Communications
影响因子：
--
作者：
Y. Nagase;T. Aoyagi;Tomoko Akimoko;T. Fuchikami
通讯作者：
Y. Nagase;T. Aoyagi;Tomoko Akimoko;T. Fuchikami
影响因子：
3
作者：
G. Yahaya;B. J. Brisdon;M. Maxwell;R. England
通讯作者：
G. Yahaya;B. J. Brisdon;M. Maxwell;R. England
DOI：
10.1002/pola.1991.080290715
发表时间：
1991-06
期刊：
Journal of Polymer Science Part A
影响因子：
--
作者：
K. Belfield;Xiangjie Lin;I. Cabasso
通讯作者：
K. Belfield;Xiangjie Lin;I. Cabasso
影响因子：
15
作者：
L. H. Sommer;Jack Gold;G. Goldberg;N. Marans
通讯作者：
L. H. Sommer;Jack Gold;G. Goldberg;N. Marans