CO2对酰基化合物引发2-吡咯烷酮聚合的影响  

Influence of CO2 on Acyl Compound Initiated Polymerization of 2-Pyrrolidone

作　　者：陈晨 陈涛[1,2] 赵黎明 邱永隽 CHEN Chen;CHEN Tao;ZHAO Liming;QIU Yongjun(Shanghai Key Laboratory of Advanced Polymeric Materials,School of Materials Science and Engineering;Key Laboratory of Bio-Based Material Engineering of China National Light Industry Council;State Key Laboratory of Bioreactor Engineering,R&D Center of Separation&Extraction Technology in Fermentation Industry,School of Bioengineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海市先进聚合物材料重点实验室 [2]中国轻工业生物材料工程重点实验室 [3]生物工程学院,生物反应器工程国家重点实验室,发酵工业分离提取技术研发中心,上海200237

出　　处：《功能高分子学报》2020年第3期290-296,共7页Journal of Functional Polymers

基　　金：国家重点研发计划项目(2017YFB0309302);上海市自然科学基金(17ZR1407200)。

摘　　要：探讨了酰基化合物存在下催化剂和CO2用量对2-吡咯烷酮聚合制备生物基聚氨基丁酸(PGABA)的影响。利用核磁共振氢谱(1H-NMR)、傅里叶转变红外光谱(FT-IR)、X射线衍射(XRD)、差示扫描量热仪(DSC)、热重分析仪(TG)表征了产物的化学结构、晶型以及热性能。结果表明:催化剂用量固定时,产率随CO2用量增加而降低;催化剂用量不大时,分子量随CO2的增加先提高后减小;催化剂用量较大时,CO2用量对分子量的影响不显著。不同CO2用量下增加催化剂用量,产物分子量出现极大值,而产率的变化较复杂。增加CO2用量对PGABA的晶型、熔点无影响,PGABA的热分解温度提高,热稳定性增加。The influence of catalyst and CO2 on the synthesis of bio-based poly(γ-aminobutyric acid)(PGABA)was investigated in the presence of an acyl compound initiator.The molecular structure and crystal form of the products were examined using magnetic resonance spectroscopy(1H-NMR),Fourier-transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD).Thermogravimetry(TG)and differential scanning calorimetry(DSC)were used to evaluate the thermal properties of PGABA prepared via different ways.Results indicated that the addition of CO2 had an adverse effect on the yield of PGABA.When the mole fraction of acyl catalyst was fixed at 6%or 7%,the molecular weight increased at first and then decreased with increasing the dosage of CO2,while the yield decreased successively.When the mole fraction of catalyst was increased to 9%,increasing the dosage of CO2 less affected the molecular weight of PGABA,but the yield kept decreasing.On the other hand,the absence of the initiator dramatically decreased the yield of PGABA in the CO2 containing system.At the different dosages of CO2,the molecular weight rose firstly and then went down with increasing catalyst mole fraction.Such a trend became not evidence at a high dosage of CO2.The impact of catalyst mole fraction on the yield was a little complex.The yield could reach a maximum with increasing the catalyst mole fraction when CO2 mole fraction was less than 13.2%,above which a positive effect of the catalyst on the yield was presented.The crystals of PGABA samples prepared through various methods were all of theαform and independent of the mole fraction of catalyst,initiator,and CO2.Moreover,introducing CO2 less affected the melting point of PGABA,but led to the increase of the thermal decomposition temperature and the improvement of the thermal stability of PGABA.

关 键 词：2-吡咯烷酮 聚氨基丁酸 二氧化碳 催化剂 酰基化合物 

分 类 号：O63[理学—高分子化学]