摘要
在丙烯酸丁酯(BA)/苯乙烯(ST)体系中引入硅氧烷3-甲基丙烯酰氧基丙基三异丙氧基硅烷(C1757),通过乳液聚合法合成了可交联型共聚硅-丙乳液(PBSC),并采用傅里叶红外光谱仪(FT-IR)对其结构进行表征。利用共混法制备了天然乳胶(NR)/PBSC复合膜,并通过扫描电子显微镜(SEM)、热重分析仪(TG)及差示扫描量热仪(DSC)等仪器对其性能进行测试。结果表明:随着PBSC的加入,改性NR膜表面及内部孔洞数量减少。当w(C1757)=12%和PBSC添加量(质量分数)为12%时,NR/PBSC拉伸强度由14.4 MPa提高到23.3 MPa,热降解特征温度T0、Tp、Tf分别提升了12.9、3.7、11.5℃。同时改性乳胶膜耐溶剂性能及耐水性能均得到改善,蛋白质溢出量明显降低(低于110μg/g)。
Natural rubber（NR）,a renewable resource,is significantly used in gloves,condoms and so on.However,NR film products have some weaknesses,such as poor solvent resistance,low tensile strength and allergic effect,which limite their applications.A high-performance thin film was prepared by blending NR with functionalized silicone-acrylate emulsion.Such emulsion possesses the better ability of film formation and weather fastness of polyacrylate,as well as the excellent heat resistance and water tolerance of polysiloxane.Additionally,O-carboxymethyl chitosan（OSC）was used as an emulsifier,which improves the biocompatibility and degradability.Cross-linkable poly（butyl acrylate-co-styrene-co-3-methacryloxypropyltris-trimethylsiloxy-silane）（PBSC）was synthesized by emulsion polymerization,and the component was confirmed by Fourier transform infrared（FT-IR）spectrograph.NR/PBSC composites were prepared by polymer blending,and their properties were studied by scanning electron microscopy（SEM）,mechanic analysis,thermos-gravimetry（TG）and differential scanning calorimetry（DSC）tests.The results revealed that the holes on film surface and inside the film reduced significantly,suggesting the enhancement of compatibility between NR phase and polymer phase. The effect of 3-methacryloxypropyltris-trimethyl siloxy-silane（C1757） mass fraction and loading of copolymer on mechanical properties of NR was investigated.As the film was formed,PBSC chains were entangled with NR and significant physical crosslinking points were developed.As a result,the maximum tensile strength was achieved at the C1757 mass fraction of 12% and copolymer additive amount of 12%.Besides,crosslinked PBSC particles produced large amounts of Si—O—Si bonds with higher bonding energy,leading to the superior thermal decomposition resistance.The characteristic temperatures,T0,Tpand Tf were increased by 12.9 ℃,3.7 ℃ and 11.5 ℃,respectively,when the mass fraction of PBSC（w（C1757）was12%）reached 12%.Meanwhile,the solvent resistance and surface hydrophobicity of NR/PBSC films were also improved and protein spillage dropped（less than 110μg/g）.
作者
史馨兰
张坤涛
田晓慧
孙金煜
元以中
SHI Xin-lan;ZHANG Kun-tao;TIAN Xiao-hui;SUN Jin-yu;YUAN Yi-zhong(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第3期348-355,共8页
Journal of East China University of Science and Technology
关键词
天然乳胶
硅-丙乳液
共混改性
交联
natural rubber
silicone acrylate emulsion
blending
crosslinking
