紫外光诱导接枝甲基丙烯酸甲酯对预硫化天然胶乳胶膜的表面改性  

Surface Modification of Prevulcanized Natural Rubber Latex Film by UV-induced Photo-grafting of Methyl Methacrylate

作　　者：卢光[1] 余和平[1] 曾宗强[1] 吕明哲[1] 王启方[1] 

机构地区：[1]中国热带农业科学院农产品加工研究所,广东湛江524001

出　　处：《特种橡胶制品》2008年第1期7-10,共4页Special Purpose Rubber Products

基　　金：中国热带农业科学院科技基金项目(项目编号:RKY0434)

摘　　要：在紫外光辐照下,通过光敏剂二苯甲酮的引发作用,使甲基丙烯酸甲酯(MMA)单体接枝共聚到预硫化天然胶乳胶膜表面,并采用傅立叶变换红外光谱-衰减全反射技术(FTIR-ATR),扫描电子显微镜(SEM)及表面接触角测试仪对表面接枝改性后的预硫化胶膜样品进行了表征。FTIR-ATR谱图清楚地表明,MMA单体已被接到硫化橡胶的分子链上;SEM显微照片显示,接枝改性后的样品表面因龟裂导致粗糙化而使其形态发生改变;表面水接触角的测试值随紫外光辐照时间的延长而降低,辐照15min的样品,其接触角测试值为62°,比未处理样品的96°降低了34°。这表明在实验条件下,MMA单体可以较为容易地接枝到天然橡胶分子链上,有效地改善了预硫化天然胶乳胶膜表面的亲水性能。In this study, methyl methacrylate monomer was grafted onto the surfaces of prevulcanized natural rubber latex（NRL） film by UV irradiation under the initiation of benzophenone. The modified samples were characterized by the fourier transform infrared spectroscopy-attenuated total reflectance（FTIR-ATR）, scanning electronic microscopy（SEM）and surface water contact angle testing. The presence of PMMA in the molecular chains of vulcanized natural rubber was clearly demonstrated by the FTIR-ATR spectra; SEM micrographics revealed that the surfaces of modified samples were roughened by cracking resulted from grafting copolymerization; the water contact angle values measured decreased with the prolonging of UV irradiation time, in which, the sample treated by 15 min of UV irradiation showed a reduction of 34° （from the initial 96° to 62°） , indicated that under the condition of this study, MMA monomer could be comparative easily grafted onto the molecular chains of vulcanized natural rubber to efficiently improve the hydropilicity of the prevulcanized NRL films.

关 键 词：预硫化天然胶乳 胶膜 甲基丙烯酸甲酯 紫外光辐照 

分 类 号：TQ330[化学工程—橡胶工业]