1,2-丁二醇共聚对聚对苯二甲酸乙二醇酯结晶行为及力学性能的影响
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摘要
为了探索生物基乙二醇中的1,2-丁二醇(1,2-BDO)作为共聚单体对生物基聚对苯二甲酸乙二醇酯(PET)的结晶行为和力学性能的影响。本文合成了生物基PET均聚物和不同1,2-BDO共聚单元摩尔分数的系列生物基PET共聚物(共聚单体摩尔分数分别为2. 0%、2. 7%和5. 6%),并采用傅里叶变换红外光谱仪(FTIR)、差示扫描量热仪(DSC)和力学测试等技术手段研究了其结晶行为和力学性能。结果表明,随着1,2-BDO共聚单元摩尔分数的增加,PET共聚物的熔融温度、结晶速率及结晶度均明显降低,表明1,2-BDO共聚单体的引入破坏了PET分子链的规整性,阻碍了PET链段的结晶。PET材料的拉伸强度随着1,2-BDO共聚单元摩尔分数的增加而降低,而弯曲强度和弯曲模量略有升高。
In this work,poly( ethylene terephthalate)( PET) homopolymer and copolymers were synthesized from biomass-derived ethylene glycol containing 0,2. 0%,2. 7%,and 5. 6% mole fraction of 1,2-butanediol( 1,2-BDO) in order to explore the effects of the comonomer on the crystallization behavior and the mechanical properties of the PET. The polymers were investigated by Fourier transform infrared spectroscopy( FTIR),differential scanning calorimetry( DSC),and mechanical testing. It is found that the melting temperature,crystallization rate and crystallinity of the PET decrease as mole fraction of 1,2-BDO comonomer increases,indicating that the incorporation of the 1,2-BDO units can disrupt the ordered structure of the PET chains and therefore hinder the crystallization. In addition,the tensile strength of PET materials decreases while the flexural modulus and strength increase slightly at higher 1,2-BDO mole fraction.
In this work,poly( ethylene terephthalate)( PET) homopolymer and copolymers were synthesized from biomass-derived ethylene glycol containing 0,2. 0%,2. 7%,and 5. 6% mole fraction of 1,2-butanediol( 1,2-BDO) in order to explore the effects of the comonomer on the crystallization behavior and the mechanical properties of the PET. The polymers were investigated by Fourier transform infrared spectroscopy( FTIR),differential scanning calorimetry( DSC),and mechanical testing. It is found that the melting temperature,crystallization rate and crystallinity of the PET decrease as mole fraction of 1,2-BDO comonomer increases,indicating that the incorporation of the 1,2-BDO units can disrupt the ordered structure of the PET chains and therefore hinder the crystallization. In addition,the tensile strength of PET materials decreases while the flexural modulus and strength increase slightly at higher 1,2-BDO mole fraction.
引文
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[2]Gallezot P.Conversion of Biomass to Selected Chemical Products[J].Chem Soc Rev,2012,41(4):1538-1558.
[3]Climent M J,Corma A,Iborra S.Conversion of Biomass Platform Molecules into Fuel Additives and Liquid Hydrocarbon Fuels[J].Green Chem,2014,16(2):516-547.
[4]Corma A,Iborra S,Velty A.Chemical Routes for the Transformation of Biomass into Chemicals[J].Chem Rev,2007,107(6):2411-2502.
[5]Rose M,Palkovits R.Isosorbide as a Renewable Platform Chemical for Versatile Applications-Quo Vadis?[J].Chem Sus Chem,2011,5(1):167-176.
[6]Fenouillot F,Rousseau A,Colomines G,et al.Polymers from Renewable 1,4:3,6-Dianhydrohexitols(Isosorbide,Isomannide and Isoidide):A Review[J].Prog Polym Sci,2010,35(5):578-622.
[7]Maki-Arvela P,Simakova I L,Salmi T,et al.Production of Lactic Acid/Lactates from Biomass and Their Catalytic Transformations to Commodities[J].Chem Rev,2014,114(3):1909-1971.
[8]HAN Guocheng.Development and Application of Environment-Friendly Polyester Material[J].Plast Sci Technol,2018,46:121-126(in Chinese).韩国程.环保型聚酯材料的发展及应用[J].塑料科技,2018,46:121-126.
[9]Tsai T Y,Naveen B,Shiu W C,et al.An Advanced Preparation and Characterization of the PET/MgAl-LDHNanocomposites[J].RSC Adv,2014,4(49):25683-25691.
[10]Wang D R,Luo F L,Shen Z Y,et al.A Study on the Crystallization Behavior and Mechanical Properties of Poly(ethylene terephthalate)Induced by Chemical Degradation Nucleation[J].RSC Adv,2017,7(59):37139-37147.
[11]Xiao B,Zhen M Y,Pang J F,et al.Synthesis and Characterization of Poly(ethylene terephthalate)from Biomass-Based Ethylene Glycol:Effects of Miscellaneous Diols[J].Ind Eng Chem Res,2015,54:5862-5869.
[12]Fann D M,Huang S K,Lee J Y.DSC Studies on the Crystallization Characteristics of Poly(Ethylene Terephthalate)for Blow Molding Applications[J].Polym Eng Sci,1998,38(2):265-273.
[13]Deshmukh G S,Pathak S U,Peshwe D R,et al.Effect of Uncoated Calcium Carbonate and Stearic Acid Coated Calcium Carbonate on Mechanical,Thermal And Structural Properties of Poly(Butylene Terephthalate)(PBT)/Calcium Carbonate Composites[J].Bull Mater Sci,2010,33(3):277-284.