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将聚乙二醇200(PEG200)或聚乙二醇400(PEG400)作为第四种单体分别和丁二酸(SA)、丁二醇(BDO)、乙二醇(EG)熔融共聚得到不同醚链长度的PEG200-PBES、PEG400-PBES共聚酯,再与改性的热塑性淀粉(TPS)共混,采用溶液混合方法,制备出固体复合材料,并且研究了引入不同醚链长度对复合材料各种性能的影响;结合分子动力学(MD)模拟分析了不同醚链长度(PEG-PBES)/TPS复合体系分子之间的相互作用.研究结果表明,随着醚链的增长,复合材料的相容性显著增加,(PEG400-PBES)/TPS复合体系的χ参数和Emix值更接近于0,内聚能密度及溶度参数值大于(PEG200-PBES)/TPS和PBS/TPS复合体系的相应值,说明PEG400-PBES与TPS有更好的相容性.同时,随着醚链的增长,复合材料拉伸强度由原来的1.86 MPa提高到8.84 MPa,断裂伸长率由25.54%提高到74.75%,热失重50%时的温度由281.68℃提高到310.53℃.
Polyethylene glycol 200 (PEG200) or polyethylene glycol 400 (PEG400) was melt-copolymerized with succinic acid (SA), butanediol (BDO) and ethylene glycol Ether chain length PEG200-PBES, PEG400-PBES copolyester, and then blended with modified thermoplastic starch (TPS), using a solution mixing method to prepare a solid composite material, and studied the introduction of different ether chain length of the composite material (PEG-PBES) / TPS complex molecule molecular dynamics (MD) simulation.The results show that with the growth of the ether chain, the molecular weight of the composite (PEG400-PBES) / TPS composite system, the χ and Emix values are closer to zero, and the cohesive energy density and solubility parameter values are greater than those of (PEG200-PBES) / TPS and PBS / TPS composite systems The corresponding values indicate that PEG400-PBES has better compatibility with TPS, meanwhile, with the increase of ether chain, the tensile strength of composite increases from 1.86 MPa to 8.84 MPa and the elongation at break increases from 25.54% to 74.75%, and the temperature at 50% weight loss increased from 281.68 ℃ to 310.53 ℃.