基于 PEO-b-PPO-b-PEO 嵌段共聚物自组装的透明纳米结构醋酸纤维素薄膜。

Transparent nanostructured cellulose acetate films based on the self assembly of PEO-b-PPO-b-PEO block copolymer.

机构信息

'Materials + Technologies' Group (GMT), Department of Chemical and Environmental Engineering, Faculty of Engineering, Gipuzkoa, University of the Basque Country (UPV/EHU), Plaza Europa 1, 20018 Donostia-San Sebastian, Spain; Faculty of Engineering Vitoria-Gasteiz, University of the Basque Country (UPV/EHU), C/Nieves Cano, 12 01006 Vitoria-Gasteiz, Spain.

出版信息

Carbohydr Polym. 2017 Jun 1;165:437-443. doi: 10.1016/j.carbpol.2017.02.070. Epub 2017 Feb 21.

DOI:10.1016/j.carbpol.2017.02.070

PMID:28363570

Abstract

In this study fabrication and characterization of transparent nanostructured composite films based on cellulose triacetate (CTA) and poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (EPE) triblock copolymer were presented. The effect of the addition of EPE triblock copolymer on the thermal stability, morphology, and mechanical properties of cellulose triacetate films was investigated. The triblock EPE was chosen since PEO blocks interact favorably with CTA, whereas, PPO blocks remain immiscible which provokes a microphase separation. This allows to obtain EPE/CTA composite films with ordered microphase-separated structures where PPO spherical microdomains are well-dispersed in PEO/CTA matrix by simple solvent-evaporation process. During this process, PEO block chains selectively interact with CTA by strong interpolymer hydrogen-bonding while PPO block microseparated. The addition even 40wt% of EPE leads to nanostructured EPE/CTA composite. The cytotoxicity assay of CTA and EPE/CTA composite films confirm non-toxic character of designed transparent nanostructured composites based on sustainable matrices.

摘要

本研究制备并表征了基于三醋酸纤维素（CTA）和聚（环氧乙烷）-b-聚（环氧丙烷）-b-聚（环氧乙烷）（EPE）三嵌段共聚物的透明纳米结构复合膜。研究了添加 EPE 三嵌段共聚物对三醋酸纤维素膜热稳定性、形态和力学性能的影响。选择三嵌段 EPE 是因为 PEO 嵌段与 CTA 有利相互作用，而 PPO 嵌段则保持不混溶，从而引发微相分离。这使得可以通过简单的溶剂蒸发过程获得具有有序微相分离结构的 EPE/CTA 复合膜，其中 PPO 球形微区在 PEO/CTA 基质中良好分散。在这个过程中，PEO 嵌段链通过强的聚合物间氢键选择性地与 CTA 相互作用，而 PPO 嵌段则发生微相分离。即使添加 40wt%的 EPE 也可以得到纳米结构的 EPE/CTA 复合材料。CTA 和 EPE/CTA 复合膜的细胞毒性试验证实了基于可持续基质的设计透明纳米复合材料的无毒特性。