一種聚乳酸基的聚酯酰胺的制備及結(jié)晶性能研究
[Abstract]:Polylactic acid (PLA) is a kind of biodegradable material derived from renewable resources. It has been widely concerned because of its good biocompatibility and excellent comprehensive properties, but it has some defects such as poor thermal stability and difficult crystallization. The method of copolymerization modification can effectively improve the crystallization and thermal stability of PLA. Therefore, a kind of polyester amide was prepared by copolymerization of poly (caprolactam) and PLA. By introducing poly (caprolactam) segments with good thermal stability and hydrogen bonding into the PLA segment, the crystallization properties of PLA were improved by making full use of the effect of hydrogen bonding on the rearrangement of PLA chains during the crystallization of poly (lactic acid). For the development of PLA in packaging and other areas of application has a great potential significance. In this paper, polyester amides were prepared with different polymerization systems. The effects of the amount of catalyst, polymerization time and polymerization temperature on the viscosity average molecular weight of polyester amides were discussed. The structure of the synthesized polyester amide was characterized by IR and NMR spectra. The differential scanning calorimeter (DSC),) thermogravimetric analyzer (TG),) polarizing microscope (POM),) was used. The thermal, crystallization and rheological properties of polyester amide were studied by X-ray diffractometer (XRD) and rotary rheometer. The results show that it is easier to prepare polyester amide by using PLA prepolymer and polycaprolactam prepolymer copolymerization system. The introduction of polycaprolactam chain improves the thermal stability of PLA, accelerates the crystallization of PLA, and decreases the storage modulus. The loss modulus increases. At the same time, in order to further study the effect of the introduction of polycaprolactam on the crystallization properties of PLA, the isothermal crystallization process of polyester amide at different temperatures and the non-isothermal crystallization process at different cooling rates were measured by DSC. Different theories and methods were used to analyze the isothermal and non isothermal crystallization kinetics of the system. The results show that the isothermal crystallization kinetics of polyester amide can be well analyzed by Avrami equation, the non-isothermal crystallization process of the system by Mozhi-depth method and Jeziorny method is ideal, but the Oz awa method is not ideal. The kinetic parameter n of isothermal crystallization is between 2.5 and 3.4, which verifies the three-dimensional spherulite morphology of polyester amide, and the activation energy of crystallization reflects that high temperature is favorable to the isothermal crystallization process. The increase of PA6 content is beneficial to the crystallization of polyester amide and the increase of cooling rate.
【學(xué)位授予單位】:湖北工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O633
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