四针状氧化锌晶须对聚乳酸结晶行为的影响

Effect of Tetrapod-Like Zinc Oxide Whisker on Crystallization Behaviors of Polylactide

运用差示扫描量热仪、偏光显微镜研究了四针状氧化锌晶须（T—ZnOw）对聚乳酸（PLA）等温结晶的结晶动力学、结晶热力学、晶体结构等结晶行为的影响。结果表明：110℃是PLA的最佳结晶温度，此时PLA结晶速率最快，半结晶时间最短；在90～130℃随等温结晶温度升高，试样的结晶度增大。T-ZnOw可以加快PLA结晶速率，这种作用在90℃时最明显，随着温度的增加减弱；但是，T—ZnOw会影响PLA的结晶热力学，使结晶度降低，这种作用在130℃时最明显，随着温度的降低减弱。此外，T-ZnOw会细化PLA晶粒。

Abstract：The effect of tetrapod-like zinc oxide whisker（T ZnOw） on the crystallization behaviors of polylactide（PLA）, including crystallization kinetics, crystallization thermody- namics and crystal structures of isothermal crystallization, was studied by DSC and polari- zing microscope. T for PI.A, at which is the shortest;and he results show that 110 ℃ is the optimal crystallization temperature the crystallization the crystallinity of rate is the highest and the semi-crystallization time the samples increases with the isothermal crystalli zation temperature increasing from 90 ℃ to 130 ℃ prove the crystallization rate of PLA, and this effect clines with the increase of temperature; howeve and decreases the declines with the thermodynamics at 130 ℃ and PI.A crystalline particles crystallinity of The addition of T ZnOw can im is the most obvious at 90 ℃ and de r, T-ZnOw influences the crystallization PLA, and this effect is the most obvious decrease of temperature. Furthermore, T-ZnOw refines