Miedzianowska Justyna, Masłowski Marcin, Strzelec Krzysztof
Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland.
Materials (Basel). 2020 Apr 1;13(7):1608. doi: 10.3390/ma13071608.
The work covers the characteristics of the functional properties of composites bordering thermoplastics and elastomers. The research is a continuation of considerations on blends in the form of a mixture of natural rubber (NR) with an ethylene-vinyl acetate copolymer (EVA) and the addition of a lignocellulose biofiller (wheat straw). After describing the processing and rheology as well as examining the thermal properties and morphology of composites (Part 1), the second part focuses on the characteristics of their performance. The effect of both different ratios of mixed polymers and the amount of filler on tensile strength and elongation at break, resistance to thermo-oxidative aging, hardness, tear resistance, barrier and damping properties, as well as flammability were investigated. The increased EVA content has shown a positive effect on tensile strength, elongation at break, resistance to thermo-oxidative aging, hardness, relative damping, tear strength, barrier and burning delay. On the other hand, a larger amount of natural rubber provides high flexibility and promotes the creation of a reinforcing structure by the filler used. Moreover, a significant impact of the addition of cereal straw on the barrier, damping, strength and flammability properties of composites was also noted. The great advantage of the prepared compositions in relation to commercial plastics is their environmental friendliness, primarily by replacing some petroleum derivatives of plastics with natural rubber and straw fibers.
这项工作涵盖了介于热塑性塑料和弹性体之间的复合材料功能特性的特点。该研究是对天然橡胶（NR）与乙烯-醋酸乙烯酯共聚物（EVA）的混合物形式的共混物以及添加木质纤维素生物填料（麦秸）的相关研究的延续。在描述了复合材料的加工、流变学以及热性能和形态（第1部分）之后，第二部分重点关注其性能特点。研究了混合聚合物的不同比例以及填料用量对拉伸强度、断裂伸长率、抗热氧化老化性能、硬度、抗撕裂性、阻隔性和阻尼性能以及可燃性的影响。EVA含量的增加对拉伸强度、断裂伸长率、抗热氧化老化性能、硬度、相对阻尼、撕裂强度、阻隔性和燃烧延迟都有积极影响。另一方面，大量的天然橡胶提供了高柔韧性，并促进了所用填料形成增强结构。此外，还注意到添加谷物秸秆对复合材料的阻隔性、阻尼性、强度和可燃性性能有显著影响。与商业塑料相比，所制备的组合物的一大优势在于其环境友好性，主要是通过用天然橡胶和秸秆纤维替代一些塑料的石油衍生物。
