Effect of Laser Surface Modification on the Crystallinity of Poly(L-Lactic Acid)
Effect of Laser Surface Modification on the Crystallinity of Poly(L-Lactic Acid)
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DOI：
10.1115/1.3039519
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发表时间：
2009-10-01
影响因子：
4
通讯作者：
Yao, Y. Lawrence
中科院分区：
文献类型：
--
作者：
Bhatla, Anubha;Yao, Y. Lawrence
半结晶聚合物如脂肪族均聚物聚（L-乳酸）（PLLA）的结晶度影响其降解和物理性能。在本文中，使用的三次谐波的Nd：YAG激光器的激光照射的结晶度，长程有序，和短程构象在PLLA膜的表面的影响进行了研究。并对影响转化的因素进行了研究。激光处理的效果的详细表征是使用显微镜，X射线衍射和红外光谱完成的。数值模拟了冷却过程中的冷却速率以及温度的时空分布。结合PLLA的熔融和结晶动力学的模拟结果被用来了解对样品结晶度的影响。研究了激光能量密度和退火条件对薄膜结晶度的影响。由于降解曲线取决于结晶度，激光加工可以潜在地用于实现具有前景的应用，如受控药物递送的改性空间控制的聚合物表面。[DOI：10.1115/1.3039519]
Crystallinity of semicrystalline polymers such as aliphatic homopolymer poly(L-lactic acid) (PLLA) affects their degradation and physical properties. In this paper, the effects of laser irradiation using the third harmonic of a Nd:YAG laser on the crystallinity, long-range order, and short-range conformations at the surface of PLLA films are investigated. The factors affecting the transformation are also studied. Detailed characterization of the effect of laser treatment is accomplished using microscopy, X-ray diffraction, and infrared spectroscopy. The cooling rates in the process and the spatial and temporal temperature profiles are numerically examined. The simulation results in conjunction with melting and crystallization kinetics of PLLA are used to understand the effect on sample crystallinity. The effects of laser fluence and annealing conditions on the crystallinity of the processed films are examined. Since degradation profiles depend on crystallinity, laser processing can potentially be used to achieve a modified spatially controlled polymer surface with promising applications such as controlled drug delivery. [DOI: 10.1115/1.3039519]