摘要
采用甲酰胺/乙二醇复配对淀粉醋酸酯进行塑化改性制备热塑性淀粉醋酸酯(FETPAS),并将其与氢化苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物接枝马来酸酐(SEBS-MAH)协同增韧聚丙烯(PP)。系统研究了复配增塑剂中甲酰胺与乙二醇的复配比例对PP共混物力学性能和耐回生性能的影响。结果表明,当复配增塑剂中甲酰胺质量分数超过50%时,PP/SEBS-MAH/FETPAS(70/18/12)共混物具有较高的缺口冲击强度,达到(68.1±3.7)kJ/m^(2)。红外测试结果表明,复配增塑剂甲酰胺和乙二醇通过氢键与淀粉醋酸酯发生相互作用,当采用FETPAS50时,PP/SEBS-MAH/FETPAS(70/18/12)共混物中形成以淀粉为核,SEBS-MAH为壳的核壳结构,有效改善了PP的抗冲击性能。耐回生性能测试表明,随着时间延长,乙二醇含量较高时PP/SEBS-MAH/FETPAS(70/18/12)共混物的缺口冲击强度和断裂伸长率降低,而拉伸强度和拉伸模量则显著提升。红外光谱和X射线衍射测试结果表明,FETPAS10的回生程度最低,1047和1022 cm^(-1)处吸光度比值的提升幅度最小,说明复配增塑剂中甲酰胺含量越高,FETPAS的耐回生性能越好。本研究为制备具有耐回生性能的淀粉增韧聚合物复合材料提供了一种新方法。
Thermoplastic starch acetate(FETPAS)was prepared by the plasticization of formamide/ethylene glycol compound,then it was used to toughen polypropylene(PP)by melt blending with the addition of maleic anhydride grafted poly[styrene-b-(ethylene-co-butylene)-b-styrene](SEBS-MAH).The effects of the mass ratios of formamide/ethylene glycol in the compound plasticizer on the mechanical properties and retrogradation resistance of PP blends were systematically studied.The results show that when the formamide mass fraction in the compound plasticizer exceeds 50%,the PP/SEBS-MAH/FETPAS(70/18/12)blend has a higher impact strength,reaching(68.1±3.7)kJ/m^(2).The FTIR analysis shows that formamide and ethylene glycol interact with starch acetate through hydrogen bonding.When using FETPAS50,the core-shell structure with FETPAS as the core and SEBS-MAH as the shell is formed in PP/SEBS-MAH/FETPAS(70/18/12)blend,the impact strength of PP blend is effectively improved.The retrogradation resistance test shows that the notch impact strength and elongation at break of the PP/SEBS-MAH/FETPAS(70/18/12)blend decreases with the increase of ethylene glycol content,while the tensile strength and tensile modulus increase significantly.Fourier transform infrared spectroscopy and X-ray diffraction results show that the FETPAS10's retrogradation resistance is the best,and the absorbance ratio at 1047 and 1022 cm^(-1) increases slowly.It indicates that the increase of formamide content in the compound plasticizer benefits the retrogradation resistance of FETPAS.This study provided a new method for preparing starch toughened polymer composites with retrogradation resistance.
作者
杨佳怡
张广翔
刘阳
姜立业
岳桓羽
赵桂艳
YANG Jiayi;ZHANG Guangxiang;LIU Yang;JIANG Liye;YUE Huanyu;ZHAO Guiyan(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China)
出处
《塑料工业》
北大核心
2025年第8期49-56,152,共9页
China Plastics Industry
基金
辽宁省教育厅科学技术研究项目(LJKMZ20220733)。
关键词
甲酰胺/乙二醇复配增塑剂
热塑性淀粉醋酸酯
耐回生性能
聚丙烯增韧
Formamide/Ethylene Glycol Composite Plasticizer
Thermoplastic Starch Acetate
Retrogradation Resistance
Toughening of Polypropylene
作者简介
通信作者:赵桂艳,女,1979年生,博士,教授,从事聚合物共混改性方面的研究。gyzhao@lnpu.edu.cn;杨佳怡,女,1999年生,硕士研究生,从事聚合物共混与改性研究。yjy18340371767@163.com。
