自由基共聚合制备功能化PVP共聚物及性能研究

Preparation and Properties of Functional PVP Copolymers by Free Radical Copolymerization

采用简单高效的一锅法合成了一种新型官能化的N-乙烯基吡咯烷酮单体([TBSE]_2-NVP),运用自由基共聚合的方法报道了结构相似的N-乙烯基吡咯烷酮(NVP)和[TBSE]_2-NVP单体的共聚合,并对所得共聚物进行了后修饰,利用核磁共振波谱(NMR)、傅里叶变换红外光谱(FT-IR)对修饰前后的共聚物进行了结构表征,通过调控单体投料比可以较好地控制共聚物的组成。进一步对所合成的共聚物进行了静态接触角(WCA)、热重分析仪(TGA)和差示扫描量热仪(DSC)的性质表征,随着疏水性单体含量的增加,共聚物的疏水性和热稳定性依次增强;相比于聚乙烯吡咯烷酮(PVP),共聚物的熔点T_(m)有所降低,在93~103℃范围内。当对共聚物进行脱保护后,共聚物表现出相似的亲水性和热稳定性,且随着羟基含量的增加,共聚物的熔点逐渐上升。

A novel functional N-vinyl-pyrrolidone monomer([TBSE]2-NVP)was synthesized by simple and efficient one-pot method.The copolymerization of NVP and[TBSE]2-NVP was studied in detail using free radical copolymerization.The structures of resultant copolymers were characterized by NMR spectroscopy and FT-IR.The composition of the copolymers could be regulated by the feeding ratio of monomers.The properties of copolymers were further certified by static water contact angle(WCA),thermogravimetry analysis(TGA)and differential scanning calorimetry(DSC).The hydrophobicity and thermal stability of the obtained copolymers gradually increased with increasing of hydrophobic monomer content.Compared to the PVP polymer,the T _(m) decreased in the PVP-co-P(TBSE-NVP)copolymers,which was between the 93~103℃.After the functional group within the copolymers was deprotected,the copolymers exhibited similar hydrophilicity and thermal stability.The T m increased with the increasing of content of hydroxyl group.