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Heat Resistant Research of Biodegradable Polylactic Acid Materials

Author: GuoYanBin
Tutor: ZouJun
School: Jiangsu University of Science and Technology
Course: Materials Physics and Chemistry
Keywords: Poly-L- lactic acid Poly-D- lactic acid Nucleating agent Crystallization
CLC: TQ320.7
Type: Master's thesis
Year: 2011
Downloads: 41
Quote: 0
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Abstract


With the growing concern for environmental protection , biodegradable material to attract a growing number of studies eyes . Polylactic acid material due to its excellent biocompatibility and biodegradability wide range of applications . However , due to the slow crystallization of polylactic acid , low crystallinity and poor heat resistance , which restricts the range of industrial applications of the polylactic material . This paper to add a nucleating agent in the polylactic acid material , and to take the heat treatment method to improve the heat resistance of polylactic acid material and crystal properties . By isothermal crystallization tester, polarized light microscopy , X - ray diffraction, the thermal deformation temperature measuring instrument and differential scanning calorimeter, electronic tensile tester and the electron microscope, the samples were analyzed and characterized , eventually obtained the following conclusions : 1. poly-D- lactic acid (PDLA) as a nucleating agent , when the crystallization temperature was 120 ° C , poly-L- lactic acid (PLLA) having the fastest rate of crystallization . PDLA and PLLA may be formed the composite structure of the stereocomplex . By annealing treatment , when the PDLA The content of up to 5% (mass fraction) when the degree of crystallinity of PLLA improved, the improvement of heat resistance , improved mechanical properties . 2 the PDLA, talc (Talc) and TMC three nucleating agent after the annealing treatment nucleating effect Comparative results show that the crystallinity and heat resistance , the PDAL as a nucleating agent of PLLA best to Talc is a nucleating agent of PLLA followed TMC as a nucleating agent of PLLA worst, but the tensile strength in descending order of the Talc / PLLA system , TMC / PLLA system , PDLA / PLLA system . 3 in the nucleating agent is compounded into the system , the the PDLA / Talc composite nucleating agent system of the heat resistance and crystallinity are greater than PDLA / TMC BICOMPONENT the nucleating agent system . PDLA / Talc composite nucleating agent system , and PDLA into the nucleating agent of the heat distortion temperature and compared to the degree of crystallinity , the heat distortion temperature and the degree of crystallinity is decreased . PDLA / TMC composite nucleating agent system as compared with the degree of crystallinity of the PDLA nucleating agent , the heat distortion temperature and the degree of crystallinity decreased . PDLA / TMC composite into the degree of crystallinity of the nucleating agent system is smaller than the degree of crystallinity of the PDLA system , while the ratio TMC / PLLA system large , and two composite thermal deformation temperature of the nucleating system is located in between 80 ° C to 90 ℃ .

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