Degradation of poly(L-lactide) under CO2 laser treatment above the ablation threshold
Degradation of poly(L-lactide) under CO2 laser treatment above the ablation threshold
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DOI：
10.1016/j.polymdegradstab.2014.07.004
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发表时间：
2014-11-01
影响因子：
5.9
通讯作者：
Abramski, Krzysztof M.
中科院分区：
文献类型：
--
作者：
Antonczak, Arkadiusz J.;Stepak, Bogusz D.;Abramski, Krzysztof M.
在本文中，我们提出了一个分析的材料性能的变化，在热影响区热影响区由CO2激光在能量密度远高于烧蚀阈值诱导。分解过程的复杂性意味着需要同时使用许多相互补充的选择性分析技术，以全面了解变化。采用差示扫描量热法（DSC）、凝胶渗透色谱法（GPC/SEC）、X射线光电子能谱法（XPS）、衰减全反射-傅里叶变换红外光谱法（ATR-FTIR）和接触角（接触角）测量对引入的变化进行表征。结果表明，CO2激光处理聚（L-乳酸）主要引起表面变化。然而，没有观察到表面的氧化。我们记录了双峰分布，多分散性指数显着增加，分子量有所降低。红外光谱反过来揭示了乙烯基基团（RCH= CH 2）的特征吸收带的存在。这些谱带的出现表明聚合物的分解是通过顺式消除反应发生的。(C)2014爱思唯尔有限公司版权所有。
In this paper, we present an analysis of changes in material properties in the heat affected zone HAZ induced by the CO2 laser at the fluence well above the ablation threshold. The complexity of the processes of decomposition implies the need for simultaneous use of many selective analytical techniques which complement each other to give a full image of the changes. Introduced changes were characterized using Differential Scanning Calorimetry (DSC), Gel Permeation Chromatography (GPC/SEC), X-ray Photoelectron Spectroscopy (XPS), Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR) and Wettability (Contact Angle) measurement. It turns out that CO2 laser processing of poly(L-lactide) mainly induces surface changes. However, oxidation of the surface was not observed. We recorded a bimodal distribution, a significant increase in polydispersity index and some reduction in the molecular weight. Infrared spectroscopy in turn revealed the existence of absorption bands, characteristic for the vinyl groups (RCH=CH2). The appearance of these bands indicates that the decomposition of the polymer occurred, among others, by means of the cis-elimination reaction. (C) 2014 Elsevier Ltd. All rights reserved.