Study of thermal properties of biodegradable composite materials based on recycled polypropylene

Abstract

Recently, the development of modern technology for producing biodegradable polymers is one of the most topical issues. Filling the polymer with natural components increases the interfacial contact boundary, through which moisture and aggressive chemicals can penetrate into the material, which accelerates the decomposition of the composite in natural conditions. This study is devoted to the study of the thermophysical properties of biodegradable composite materials based on recycled polypropylene with various natural fillers of plant origin. In this work, we measured the thermal conductivity and resistivity depending on temperature, filler concentration and residence time in the recovered soil in which the samples were biodegraded, shows the relationship between the change in thermal conductivity and resistivity of the studied samples and proposed preliminary conclusions about the mechanisms of thermal conductivity of the materials considered. Adding natural fillers of plant origin to composites based on recycled polypropylene gradually increases the thermal conductivity coefficient with increasing filler content. In this case, the resistivity decreases, and, with an increase in the content of the filler, this decrease becomes more significant. This means that with an increase in conductivity, the coefficient of thermal conductivity also increases, which is typical for materials in which charge transfer occurs at the expense of electrons. As a result of destruction under the influence of the environment, the thermal conductivity of the samples decreases, and the change is most significant for samples with a high content of filler.

Accelerated climatic aging of polymer composite materials based on polypropylene and aluminum oxide

“…The measuring procedure of the thermal conductivity coefficient of composite materials based on PP is given in [4].…”

“…For thermoplastics with a low degree of crystallinity at 0 -200°C, thermal conductivity ranges from 0.125 to 0.2 W / (m • K). Higher thermal conductivity is achieved only in the presence of certain fillers [4]. From this point of view, a promising mineral dispersed filler PCM based on PP is aluminum oxide, which has a number of advantages: it has high chemical and thermal stability, has excellent thermal and electrical characteristics, good mechanical resistance, a wide raw material base and the ability to impart low combustibility to materials [10 -12].…”

Thermal properties of polymer compounds based on recycled polypropylene and polyethylene

“…Разработка новых материалов из синтетических полимеров и расширение ассортимента пластмассовых изделий на их основе приводит к увеличению экологической нагрузки на окружающую среду ввиду длительного времени разложения таких веществ после выхода из эксплуатации и попадания в бытовой мусор [1][2][3]. Значительная доля пластикового мусора приходится на пластмассовые изделия из полипропилена, представляющего собой термопластичный полимер, годный для повторной переработки технологически простыми методами литья под давлением и экструзии [4 -10].…”

Simulation of Rheological Behavior of Secondary Polymer Feedstock in the Presence of Inorganic Fillers under Conditions Corresponding to Processing of Polymers by Extrusion and Die Casting

“…It is known that polymer composite materials (PCM) attract the highest attention with regard to further modification and possible wide scale application [1]. The PCM are based on polymer binders modified by various additives [2][3][4] including inorganic matters. Inorganic fillers are used mainly for decrease in shrinkage, residual strains and propensity for cracking as well as improvement of strength properties [5].…”