以聚乙烯醇（PVA）和苯甲醛为原料,二甲基亚砜为溶剂,对甲基苯磺酸为催化剂,采用均相工艺合成得到聚乙烯醇缩苯甲醛（PVB）。通过衰减全反射-傅里叶红外光谱（ATR-FT-IR）、紫外-可见光谱（UV-Vis）、核磁共振氢谱（1 H NMR）、核磁共振碳谱（13C NMR）等测试手段对聚乙烯醇缩苯甲醛结构进行了表征。利用差式扫描量热仪（DSC）测定了聚乙烯醇缩苯甲醛的玻璃化温度（Tg）。采用差热分析（DTA）和热重分析（TGA）对聚乙烯醇缩苯甲醛热稳定性进行了研究。DSC结果表明聚乙烯醇缩苯甲醛的玻璃化温度为106.0℃。DTA和TGA结果表明聚乙烯醇缩苯甲醛热稳定性良好,在空气中150℃仍未见分解。
Poly（vinyl alcohol）（PVA） was modified by aldehyde acetal reaction with benzaldehyde to give poly（vinyl benzal）（PVB）.The structure of PVB was characterized by ultraviolet-visible spectroscopy（UV-Vis）,Fourier transform infrared spectroscopy（FT-IR） and nuclear magnetic resonance spectra（NMR）.The glass-transition temperature of PVB was evaluated by differential scanning calorimetry（DSC） and the thermal stability of PVB was tested by differential thermal analysis（DTA） and thermogravimetric analysis（TGA）.DSC traces showed that polymer PVB has one single glass transition temperature at 106℃.DTA and TGA curves proved that PVB has good thermal stability.
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