防雾包装材料用助剂的研究

Additives in Antifogging Packaging Materials

目的制备一种功能性核-壳结构复合微球。方法以过硫酸铵(APS)引发剂引发苯乙烯(St)、丙烯酸(AA)和甲基丙烯酸甲酯(MMA)进行无皂乳液聚合。采用红外光谱分析仪(FT-IR)对功能微球的结构进行表征,通过扫描电子显微镜(SEM)和激光衍射粒度分析仪对产物的形貌、粒径大小及分布进行分析,采用接触角测定仪(OCA)对材料薄膜与水的接触角进行测定。讨论控制功能微球形态、粒径及分布的影响因素,并研究功能微球薄膜在不同温度下亲水性的变化。结果功能微球为亚微米级核-壳结构,该微球以PSt为核,以亲水性的MMA-AA链段为壳,单分散性良好。结论在25℃时功能微球涂覆薄膜与水的接触角为3°具有最佳的超亲水性能。

Objective To prepare a kind of core-shell functional microsphere. Methods Microspheres were synthesized by soap-free emulsion polymerization method with styrene （St）, methyl methacrylate （MMA） and acrylic acid （AA） using APS as initiator. The structure of the microsphere was characterized by FT-IR, the morphology and particle size of the microspheres were evaluated by SEM and laser particle analyser. The water contact angel was measured by OCA. Factors influencing the morphology and particle size of the microspheres were well studied. And the variation of hydrophilicity of the functional micro- sphere film was studied at different temperatures. Results The as-prepared mierospheres with PSt as core and MMA-AA as shell showed uniform morphology and excellent monodispersity. Conclusions The microsphere coated film showed the highest superhydrophilicity with a water contact angle of 3°at 25 ℃.