溴化环氧化天然橡胶的制备与表征  

Preparation and Characterization of Brominated Epoxidized Natural Rubber

作　　者：陈奕[1] 薛行华[1] Yi Chen;Xinghua Xue(College of Materials and Chemical Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学材料与化工学院

出　　处：《高分子材料科学与工程》2019年第11期145-149,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21264006)

摘　　要：采用胶乳法对天然橡胶(NR)进行环氧化和溴化制备溴化环氧化天然橡胶(BENR),考察溴化工艺如溴化时间、溴化温度、体系pH和溴化剂用量对BENR溴含量和羟基含量的影响,并采用傅里叶变换红外光谱、核磁共振光谱和热重分析对BENR产物的微观结构进行表征。结果表明,环氧化天然橡胶(ENR)在溴化反应中发生了α-取代反应,另外环氧基团还发生开环反应生成了羟基;BENR在N2中分3个阶段降解,在空气中分4个阶段降解;溴化剂用量为10 mL,溴化时间为20 min,溴化温度45℃,体系pH值为2时,BENR溴含量和羟基含量分别为44.89%和1.59%,随着溴含量的增加,BENR逐渐失去弹性变为粉末状。The brominated epoxidized natural rubbers(BENR) were prepared by epoxidation and bromination of natural rubber(NR) from latex. The effects of bromination conditions such as the bromination time, bromination temperature, pH value and amount of brominating agent on bromine contents and hydroxyl contents of BENR products were investigated. The microstructures of BENR were characterized by FT-IR, 1H-NMR and thermogravimetric analysis(TG). The results confirm the α-substitution reaction and the ring-opening reaction of the epoxy groups occur during the bromination of ENR. BENR degrad in 3 stages in N2 atmosphere and 4 stages in air. The bromine content and hydroxyl content of BENR are 44.89% and 1.59%, respectively, when the amount of brominating agent is 10 mL, bromination time 20 min, bromination temperature 45 ℃ and pH value 2. With the increment of bromine contents, BENR gradually loss its elasticity and become powdery.

关 键 词：天然胶乳 溴化环氧化天然橡胶 溴含量 羟基含量 热降解 

分 类 号：TQ332.5[化学工程—橡胶工业]