Study on Non-Isothermal Crystallization Kinetics of PBAT/talc Powder Composites
The non-isothermal crystallization behavior and kinetics of PBAT,PBAT/talc powder composites was studied by differential scanning calorimentry combined with the Avrami equation.The modified Avrami theories of Jeziorny and Mo's method were used to analyze the data.The activation energy of non-isothermal crystallization of PBAT and PBAT/talc powder composites were calculated by Kissinger's method.The results showed that proper talc powder had the effect of heterogeneous nucleation in crystallization,increased the crystallization temperature and crystallization rate of PBAT,and decreased the grain size.When the mass fraction of talc powder were 20%,the crystallization rate and absolute value of non-isothermal crystallization activation energy reached the highest value.However,when the talc content is too high,the melt viscosity of the composites increases significantly,the movement of the PBAT molecular chain is blocked,and the speed of regular and orderly arrangement decreases,resulting in a decrease in the crystallization rate and the absolute value of non-isothermal crystallization activation energy.
Poly(adipic acid)/butylene terephthalateTalc powderDifferential scanning calorimetryNon-isothermal crystallization kineticsCrystallization activation energy
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