环氧氯丙烷对水溶性聚乙烯醇纤维的表面改性及增强机理

Surface modification of PVA fiber with epoxy chloropropane and its mechanism of curing reinforcement

采用环氧氯丙烷通过溶胀悬浮多元接枝共聚法对水溶性聚乙烯醇(PVA)纤维进行表面改性,讨论了未改性和改性PVA纤维含量、环氧氯丙烷添加量、干燥温度、干燥时间及PVA纤维水溶温度对纸张干、湿拉力以及湿强度的影响。研究结果表明PVA纤维经环氧氯丙烷改性后,纸张的各项强度均有大幅提高,同时明显改善了其粘缸粘布行为和分散性。当干燥温度为100～110℃,干燥时间为10min,纤维水溶温度为80℃时,纸张具有较佳的强度。红外光谱图证实了环氧基团在原纤维表面的接枝改性反应。扫描电镜图表明PVA纤维经环氧改性后,表面由光滑结构转变为鳞状沟壑结构。原子力显微镜图AFM进一步说明了PVA纤维表面的亲水性基团部分被疏水性环氧基所取代,可增强纤维间的结合力。

Suspension multi-grafting copolymerization was adopted to surface modify the water soluble polyvinyl alcohol fiber （PVA） by use of epoxy chloropropane. In addition, the influence of the unmodified and modified PVA fiber content, the epoxy chloropropane addition, the drying temperature and the drying time on paper wet strength were discussed. Our study indicated that PVA fibers modified with epoxy chloropropane were more ef- fective to increase the paper strength, and significantly improve the problem of staining the trough or aggrega- tion and dispersion in water, the optimum condition for a satisfactory paper strength is as follow： drying tem- perature of 100-110~C,drying time of 10 min, solubility temperature of 80~C. What＇s more, the structure of the fiber was characterized by Fourier transform infrared spectroscopy （FT-IR）, which showed that the epoxy groups were introduced into the fiber surface successfully. And the changes of the form of fiber surface were ob- served by the scanning electron microscopy （SEM） and the photograph of atomic force microscope （AFM） showed that the hydrophilic group of the PVA surface were taken place by hydrophobic epoxy.