Compatibilization and ultraviolet blocking of PLA/PCL blends via interfacial localization of titanium dioxide nanoparticles
Compatibilization and ultraviolet blocking of PLA/PCL blends via interfacial localization of titanium dioxide nanoparticles
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DOI：
10.1002/app.45813
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发表时间：
2018-02-10
影响因子：
3
通讯作者：
Becker, Daniela
中科院分区：
文献类型：
--
作者：
Decol, Marindia;Pachekoski, Wagner M.;Becker, Daniela
在这项工作中，二氧化钛除了形态和紫外线（UV）阻挡性能的聚乳酸（PLA）和聚（-己内酯）（PCL）的共混物的影响进行了研究。显微照片显示在PLA/PCL共混物中具有42/58（wt %/wt %）的部分共连续结构，并且TiO 2纳米颗粒的添加导致结构相转化，即，连续的PCL和具有分散部分的部分连续的PLA。由于动力学效应（熔融温度之间的大差异）和纳米颗粒几何形状（低纵横比），观察到TiO 2纳米颗粒优选地定位在两相的界面处。观察到添加纳米TiO 2粒子的相之间的粘附性和形态稳定性的改善。这种行为表明，纳米粒子可以作为增容剂，由于它们的本地化在两相之间的界面。在42 PLA/52 PCL共混物中，当TiO 2含量为1.5%时，发生紫外光吸收和透射逾渗阈值。(c)2017年Wiley Periodicals，Inc. J.应用聚合物Sci. 2018，135，45813。
In this work, the effect of TiO2 addition over morphological and ultraviolet (UV) blocking properties of poly(lactic acid) (PLA) and poly(-caprolactone) (PCL) blends was investigated. The micrographs showed a partially co-continuous structure in the PLA/PCL blend with 42/58 (wt %/wt %) and the TiO2 nanoparticles addition leads to a structural phase inversion, i.e., continuous PCL and partially continuous PLA with a dispersed portion. TiO2 nanoparticles were observed to be preferably localized at the interface of the two phases due to kinetic effects (large difference between the melting temperatures) and nanoparticle geometry (low aspect ratios). An adhesion improvement between the phases and morphological stability were observed with the addition of TiO2 nanoparticles. This behavior indicates that the nanoparticles can act as compatibilizers due to their localization at the interface between the two phases. The UV light absorption and transmission percolation threshold occurred with 1.5% TiO2 in the 42PLA/52PCL blend. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45813.