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首页> 外文期刊>Journal of Applied Polymer Science >Graft polymerization of methacrylic acid onto polytetrafluoroethylene initiated by alkyllithium/electron-donating solvents
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Graft polymerization of methacrylic acid onto polytetrafluoroethylene initiated by alkyllithium/electron-donating solvents

机译：烷基锂/给电子溶剂引发的甲基丙烯酸到聚四氟乙烯上的接枝聚合

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摘要

Graft polymerization of methacrylic acid (MAA) onto polytetrafluoroethylene (PTFE), initiated by the mixed solution of alkyllithium/hexamethylphosphoramide (HMPA) at low temperature, was studied. Using electron spin resonance (ESR), nuclear magnetic resonance, X-ray photoelectron and vibrational (infrared) spectroscopies, the chemical structure of the grafted poly(methacrylic acid) (PMAA) onto the PTFE (PTFE-g-PMAA) was investigated. The grafted PMAA was found to be located deeper than 2.5 nm from the surface of the PTFE. The molecular motion of the PTFE-g-PMAA was also studied by means of the temperature-dependent ESR spectra of the spin-labeled PTFE-g-PMAA. The results suggested that the molecular motion of the grafted PMAA chain was mainly controlled by that of the principal PTFE chain, and the evaluated activation energy was lower for the grafted PMAA chain (e.g., 6.5 kJ/mol at temperature range below 295 K) than that for the PMAA homopolymer (13.2 kJ/mol). (C) 2004 Wiley Periodicals, Inc.
机译：研究了由烷基锂/六甲基磷酰胺（HMPA）的低温混合溶液引发的甲基丙烯酸（MAA）在聚四氟乙烯（PTFE）上的接枝聚合。使用电子自旋共振（ESR），核磁共振，X射线光电子和振动（红外）光谱学，研究了接枝到聚四氟乙烯（PTFE-g-PMAA）上的聚（甲基丙烯酸）（PMAA）的化学结构。发现接枝的PMAA位于距PTFE表面2.5纳米的深度处。还通过自旋标记的PTFE-g-PMAA的温度相关ESR光谱研究了PTFE-g-PMAA的分子运动。结果表明，接枝的PMAA链的分子运动主要受主PTFE链的分子运动控制，并且对接枝的PMAA链的评估活化能比（在低于295 K的温度范围内为6.5 kJ / mol）要低。对于PMAA均聚物（13.2 kJ / mol）。 （C）2004年Wiley Periodicals，Inc.

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