聚乙烯醇/聚乙烯基吡咯烷酮共混体系相容性研究

NISCIBILITY INVESTIGATION OF POLY (VINYL ALCOHOL)/ POLY(VINYL PYRROL IDONE) BLENDS

用DSC、FTIR、SAXS和测定Flory-Huggins相互作用参数等方法对聚乙二醇(PVA1)/聚乙烯基吡咯烷酮(PVP)共混体系的研究。结果表明,该体系具有完全互容的性质。共混物只有一个玻璃化转变温度。用DMSO作溶剂浇铸的膜光学透明。PVA1的长周期和片晶厚度均随PVP含量增加而增大,但后者增大的幅度比前者小得多,表明PVP和PVA1的非晶部分形成均相并夹入到球晶内部。共混物中PVP羰基吸收峰和PVA1的羟基吸收峰与相应均聚物相比,在红外光谱图中皆向低频方向迁移,迁移波数随第二组分含量的增加而增大。表明二者间有氢键生成。用平衡熔点计算的Flory-Huggins相互作用参数为-0.88。

The pair poly (vinyl alcohol) (PVAI) and poly (vinyl pyrrolidone) (PVP) was shown to form completely miscible blends based on following experimental results. A single glass transition temperature was observed by DSC and optically clear films were obtained by casting solutions with DMSO as common solvent. Long spacings of PVAI increased with increasing of the content of PVP rapidly and thickness of lamellae of PVAI was changed slightly as derived from SAXS- It could be explained that two amorphous phases of PVAI and PVP were miscible and sandwich among lamellae of PVAI. Comparing with plain PVAI and PVP infrared absorption bands of hydroxyl group (OH) of PVAI and carbonyl group (CO) of PVP in blends shifted towards low vibrating frequency. It suggested that hydrogen bonds were formed between PVAI and PVP. Flory-Huggins interaction parameters calculated based on equilibrium melting points was -0.88.