紫外老化对聚乳酸结晶及力学性能的影响
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国家自然科学基金资助项目(51703121);中国博士后科学基金特别资助项目(2018T111050)


Effect of Ultraviolet Aging on Crystallization and Mechanical Properties of Polylactic Acid
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    摘要:

    采用紫外老化试验仪对聚乳酸(PLA)进行加速老化处理,探究短周期紫外老化后,PLA试样表面与内部不同的老化行为,以及不同老化时间对PLA的结晶及力学性能的影响。结果表明,随老化时间的延长,PLA表面的C=O衍射强度变小,PLA内部C=O的衍射强度先减小后增大,同时,PLA表面区域的断面形貌比内部更加粗糙,且出现一定的交联现象。经老化处理24 h,48 h,72 h后,PLA表面的结晶度(Xc)依次增大至19.4%,32.7%,35.2%,PLA内部的Xc依次增大至15.0%,27.5%,32.6%;相同老化时间下,PLA表面的Xc总是大于PLA内部的,且随着老化时间的延长,这种趋势逐渐减小。相比于老化前,老化72 h的PLA拉伸强度、冲击强度、弹性模量分别提高了11.49%,38.38%,43.2%。

    Abstract:

    The accelerated aging treatment of polylactic acid (PLA) was carried out by ultraviolet aging tester. The effects of short-cycle UV aging on different surface aging mechanisms of PLA and internal aging, as well as the crystallization time and mechanical properties of PLA were investigated. The results show that with the increases of aging time, the C=O diffraction intensity of the PLA surface becomes smaller continuously, while the C=O diffraction intensity of the PLA inside decreases first, and then increases. Moreover, the surface morphology of PLA surface area where shows a few partial cross-linking is rougher than that of the inside. After aging treatment for 24 h, 48 h and 72 h, the crystallinity (Xc) of PLA surface increases to 19.4%, 32.73% and 35.22%, and Xc of PLA inside increases to 14.98%, 27.52% and 32.63%, respectively. Notly, Xc of the PLA surface is always larger than that of the inside, and this tendency gradually decreases with the increase of aging time. Compared to PLA without aging, the tensile stress, impact strength and elastic modulus of PLA aged for 72 h are increase by 11.49%, 38.38% and 43.2%, respectively.

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曹 乐,贾仕奎,张奇锋,王 忠,陈立贵,付 蕾.紫外老化对聚乳酸结晶及力学性能的影响[J].高分子材料科学与工程,2020,36(7):60-66.

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  • 在线发布日期: 2020-09-08
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