纺丝级生物基聚呋喃二甲酸乙二醇酯的合成及纤维制备

Synthesis and fiber fabrication of spinning grade bio-based polyethylene furandicarboxylate

针对生物基聚呋喃二甲酸乙二醇酯(PEF)因分子量小、脆性大而导致其在纺织化纤领域的应用受限的难题,利用不同催化剂、工艺条件合成PEF;优选醋酸锌-钛酸四丁酯组合作为催化剂,合成数均分子量(Mn≈30 000 g/mol)、分子量分布(多分散指数PDI<3)均适用于纺丝的PEF。采用傅里叶变换红外光谱(FTIR)、核磁共振氢谱(1H-NMR)等表征PEF的形貌与结构;采用差示扫描量热法(DSC)和热失重分析(TGA)表征PEF的热性能,并通过两步法纺丝工艺UDY-DTY(未拉伸丝-拉伸变形丝)制备PEF纤维,研究牵伸倍数对纤维力学性能的影响。结果表明:合成的PEF玻璃化转变温度为90~92℃,熔点为210~213℃,起始热分解温度高于370℃,具有良好的热稳定性;两步法制备的PEF纤维的断裂强度最高达2.17 cN/dtex,基本可以满足纺织领域的应用要求。

To resolve Aiming at the problem of the limited application of bio-based polyethylene furandicarboxylate(PEF)with low molecular weight and high brittleness that restricts its application in the field of textile and chemical fiber due to its small molecular weight and high brittleness,PEF was synthesized using Therefore,this work applies various catalysts and polymerization condition to synthesize PEF.A zinc acetate-Ti(OBu)4 combined catalyst was chosen to fabricate the PEF that suited for spinning,whose mean molecular weight(M n)approached to 30000 g/mol and the polymer dispersity index(PDI)was less than 3.Fourier transform infrared spectrometer(FTIR)and 1H-NMR were used to characterize the morphology and structure of PEF.Differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA)were conducted to characterize the thermal properties of the polyester.The PEF fibers were prepared through the two-step method UDY-DTY(undrawn yarn-drawn twist yarn)and the effect of different drawing ratio on the mechanical strength properties of fibers was studied.The results indicate show that the polyester has the glass transition temperature of PEF is(T g)90-92℃,the melting point of PEF(T m)is 210-213℃,and the initial thermal decomposition temperature of PEF is higher than 370℃,which indicating that PEF has good thermal stability.Also,The highest breaking strength of PEF fibers is can reach up to 2.17 cN/dtex,which can basically meet the application in textile field.