摘要
以大豆分离蛋白（SPI）为原料,过硫酸铵为引发剂,亚硫酸钠为变性剂,在尿素溶液中用接枝共聚的方法,与丙烯酸甲酯（MA）和甲基丙烯酸甲酯（MMA）混合单体反应,合成了热塑性SPI材料（T-SPI）。研究了不同反应条件对接枝反应的影响,在250mL水中,16g SPI与单体接枝的最佳反应条件为：尿素浓度2mol/L,引发剂用量35mmol/L,单体浓度1.23mol/L,反应温度70℃,反应时间4h。用傅里叶红外光谱仪、差示扫描量热仪和转矩流变仪等对材料进行了分析,说明单体成功地接枝到SPI上,出现了明显的玻璃化转变过程,玻璃化温度为66.35℃,塑化时间为113s。证明接枝产物具有较好的热塑性。
The thermoplastic copolymers（T-SPI） were prepared from soy protein isolate（SPI） grafted with methyl acrylate（MA） and methyl methacrylate（MMA） in urea aqueous solution with ammonium persulfate as initiator and sodium sulfite as denaturant. The influences of the reaction conditions on the grafting rate were investigated. The grafting rate of 16g SPI was preferable under the conditions of urea concentration 2mol/L, initiator concentration 35mmol/L, monomer concentration 1.23mol/L, reaction temperature 70℃, reaction time 4h in 250mL deionized water. The material was analyzed by means of FT-IR, DSC and torque rheometer. The results indicated： the monomer is grafted on SPI successfully, and T-SPI has a glass transition temperature of 66.35℃, the plasticizing time is 113 s. All of them proved that this material has a good thermoplasticity.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2010年第4期15-19,共5页
Chemistry and Industry of Forest Products
基金
“十一五”国家科技支撑计划资助(2007BAE42B04)
关键词
大豆分离蛋白
热塑性
接枝共聚
soy protein isolate
thermoplasticity
grafting copolymerization
