The Study of Properties and Structure of Polylactide–Graphite Nanoplates Compositions

Abstract

Composites of polylactide containing graphite nanoplates as a filler in the concentration range 1–20 wt% were prepared in methylene chloride using the sonication technique. The thermal characteristics and phase transitions were studied by DSC and TGA methods. The temperatures and heats of glass transition, crystallization, and melting were determined, and the degree of crystallinity during primary and secondary heating was calculated. It is shown that the introduction of graphite nanoplates leads to an increase in the elastic modulus and a decrease in the breaking stress and elongation at break. These changes are especially pronounced at 20% GNP content in the composition, when the corresponding mechanical parameters are characteristics of brittle polymer systems. The study of the electrical properties of the composites showed that the percolation threshold in these materials is close to 7 wt%, which is significantly lower than in the case of spherical particles of comparable density. The SEM study of the filled composites showed a system of pores, which were apparently formed during the evaporation of solvent in the process of their preparation. Diverse structures of PLA/GNP composites films after hot pressure were established by the SEM method.

A review: studying the effect of graphene nanoparticles on mechanical, physical and thermal properties of polylactic acid polymer

“…162,163 In the case of nanocomposites, mechanical and thermal properties are increased by adding a small percentage of nanometer ampliers. [164][165][166][167][168] The uniform distribution of the amplier phase creates a large interface between the nanometer amplier phase and the matrix ground phase. There are two major challenges to producing a nanocomposite.…”

Влияние Способа Получения Наполненных Полимерных Нанокомпозитов Полилактид—восстановленный Оксид Графена На Их Свойства И Структуру

“…При восстановлении ОГ происходит частичное восстановление и удаление кислородосодержащих групп, в результате чего образуется ВОГ. Поэтому терморасширенный графит и ВОГ благодаря хорошей тепло-и электропроводности представляют собой перспективные наполнители при создании композитов, улучшающих не только физико-химические характеристики ПЛА, но и повышающие его теплостойкость [7][8][9].…”