de Araújo Maria José G, Barbosa Rossemberg C, Fook Marcus Vinícius L, Canedo Eduardo L, Silva Suédina M L, Medeiros Eliton S, Leite Itamara F
Graduate Program in Science and Materials Engineering, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil.
Department of Materials Engineering, Federal University of Campina Grande, Campina Grande, PB 58429-900, Brazil.
Materials (Basel). 2018 Feb 13;11(2):291. doi: 10.3390/ma11020291.
In this study, blends based on a high density polyethylene (HDPE) and chitosan (CS) were successfully prepared by melt processing, in a laboratory internal mixer. The CS biopolymer content effect (up to maximum of 40%), and, the addition of bentonite clay modified with quaternary ammonium salt (CTAB) impregnated chitosan as a compatibilizing agent, on the properties of the blends was analyzed by Fourier transform-infrared spectroscopy (FT-IR), wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analyses (TG), tensile strength, and scanning electron microscopy (SEM). The use of clay modified with CTAB impregnated chitosan, employing a method developed here, improved the compatibility of HDPE with chitosan, and therefore the thermal and some of the mechanical properties were enhanced, making HDPE/chitosan blends suitable candidates for food packaging. It was possible to obtain products of synthetic polymer, HDPE, with natural polymer, chitosan, using a method very used industrially, with acceptable and more friendly properties to the environment, when compared to conventional synthetic polymers. In addition, due to the possibility of impregnated chitosan with quaternary ammonium salt exhibit higher antibacterial activity than neat chitosan, the HDPE/chitosan/organobentonite blends may be potentially applied in food containers to favor the preservation of food for a longer time in comparison to conventional materials.
在本研究中，通过在实验室内部混合器中进行熔融加工，成功制备了基于高密度聚乙烯（HDPE）和壳聚糖（CS）的共混物。通过傅里叶变换红外光谱（FT-IR）、广角X射线衍射（WAXD）、差示扫描量热法（DSC）、热重分析（TG）、拉伸强度和扫描电子显微镜（SEM），分析了CS生物聚合物含量的影响（最高可达40%），以及添加用季铵盐（CTAB）浸渍壳聚糖改性的膨润土作为增容剂对共混物性能的影响。采用此处开发的方法，使用用CTAB浸渍壳聚糖改性的粘土，提高了HDPE与壳聚糖的相容性，因此增强了热性能和一些机械性能，使HDPE/壳聚糖共混物成为食品包装的合适候选材料。与传统合成聚合物相比，使用一种工业上常用的方法，能够获得具有天然聚合物壳聚糖的合成聚合物HDPE产品，其具有可接受且对环境更友好的性能。此外，由于用季铵盐浸渍的壳聚糖比纯壳聚糖表现出更高的抗菌活性，与传统材料相比，HDPE/壳聚糖/有机膨润土共混物可能潜在地应用于食品容器中，以利于食品的更长时间保存。
