不同接枝度的十八硫醇化聚氯乙烯梳状聚合物的结构和性能

发布时间：2018-05-04 11:37

  本文选题：梳状聚合物 + 侧链烷基　； 参考：《高分子学报》2016年05期

【摘要】：通过亲核取代反应,制备了一系列不同接枝率的十八硫醇(C_(18)H_(37)SH)接枝改性聚氯乙烯(PVC)(记作PVCS18).通过傅立叶变换红外光谱(FTIR)、核磁共振氢谱(1H-NMR)、示差扫描量热仪(DSC)、热重分析(TG)和X射线衍射(XRD)对PVCS18的结构、相变行为、热稳定性和热能行为进行了研究.结果表明,随十八硫醇钠(C_(18)H_(37)SNa)投料的增加,PVCS18接枝率增加,最高达到50.2%.PVCS18相转变的出现,主要是接枝的十八烷基链段贡献的.随接枝率由8.5%增加到50.2%,相转变温度由61.7℃升高到66.3℃,热焓值由5.3 k J/mol提高到50.9 k J/mol,结晶碳原子数从1.4增加到13.8.主侧链间连接键的极性和基团大小明显影响侧链烷基的结晶能力及可结晶碳原子数目.PVCS18的热稳定性较PVC的没有明显热损失行为出现,该材料可在较高的温度下加工使用.
[Abstract]:A series of octadecyl mercaptan (C _ (18) C _ (18) H _ (10)) H _ (37) H _ (H) H _ (12) H _ (12) H _ (13) H _ (12) H _ (12) H _ (13) H _ (12) H _ (12) H _ ( The structure, phase transition behavior, thermal stability and thermal behavior of PVCS18 were studied by Fourier transform infrared spectroscopy (FTIR), 1H-NMR-NMR, differential scanning calorimeter (DSC), thermogravimetric analysis (TG) and X-ray diffraction (XRD). The results show that with the increase of C _ (18) H _ (-1) S _ (Na) feed, the graft ratio of 50.2%.PVCS18 _ (18) is increased, and the highest phase transition is achieved, which is mainly due to the contribution of the grafted octadecyl chain. With the increase of grafting rate from 8.5% to 50.2%, the phase transition temperature increases from 61.7 鈩，

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