Effect of High Pressure Treatment on Poly(lactic acid)/Nano⁻TiO₂ Composite Films.

Hai Chi,Cheng Zhang,Minglong Yuan,Chunli Fan,Yuyue Qin,Wenhui Li,Lin Li

doi:10.3390/molecules23102621

Abstract

The microstructure, thermal properties, mechanical properties and oxygen and water vapor barrier properties of a poly(lactic acid) (PLA)/nano-TiO2 composite film before and after high pressure treatment were studied. Structural analysis showed that the functional group structure of the high pressure treated composite film did not change. It was found that the high pressure treatment did not form new chemical bonds between the nanoparticles and the PLA. The micro-section of the composite film after high pressure treatment became very rough, and the structure was depressed. Through the analysis of thermal and mechanical properties, high pressure treatment can not only increase the strength and stiffness of the composite film, but also increase the crystallinity of the composite film. Through the analysis of barrier properties, it is found that the barrier properties of composite films after high pressure treatment were been improved by the applied high pressure treatment.

Highlights

In the past few decades, petroleum-based synthetic plastics have been widely used around the world, and a large number of industrial wastes generated by these polymers have been introduced to the ecosystem every year [1]
The results showed that the condensation and melting motion is weakened, resulting in the molecular chain alignment close to form a crystalline state of temperatures of the three kinds of films were not affected by high pressure treatment
Nano-TiO2 was embedded into poly(lactic acid) (PLA) by melt blending to form PLA-based nano-TiO2 composites, and the composite film materials were treated under high pressure

Summary

Introduction

In the past few decades, petroleum-based synthetic plastics have been widely used around the world, and a large number of industrial wastes generated by these polymers have been introduced to the ecosystem every year [1]. The problem of environmental pollution is becoming more and more serious, more and more people are paying attention to biodegradable packaging materials. Poly(lactic acid) (PLA), a starch derived from fermented plants originating from renewable resources, is rapidly becoming one of the alternatives to petroleum-based plastics [2,3]. As an environmentally friendly material, its performance is excellent and its use is extensive. It has immeasurable consumption potential and development prospects.

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Conclusion