Quiroz-Castillo Jesús Manuel, Rodríguez-Félix Dora Evelia, Grijalva-Monteverde Heriberto, Lizárraga-Laborín Lauren Lucero, Castillo-Ortega María Mónica, Del Castillo-Castro Teresa, Rodríguez-Félix Francisco, Herrera-Franco Pedro Jesús
Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, C.P. 83000 Hermosillo, Sonora, Mexico.
Departamento de Ingeniería Ambiental Industrial, Universidad Estatal de Sonora, C.P. 83100 Hermosillo, Sonora, México.
Materials (Basel). 2014 Dec 30;8(1):137-148. doi: 10.3390/ma8010137.
The use of mixtures of synthetic and natural polymers is a potential option to reduce the pollution by plastic waste. In this work, the method for the chemical modification of chitosan with poly(lactic acid) was developed; then, the preparation of films of blends of polyethylene and chitosan-poly(lactic acid) produced by an extrusion method using polyethylene-graft maleic anhydride as a compatibilizer. It was possible to obtain films with a maximum content of 20 wt% and 30 wt%, chitosan, with and without compatibilizer, respectively. Scanning electron microscope (SEM) analysis showed a homogeneous surface on all films. The addition of the compatibilizer had a significant effect on the mechanical properties of the films, such as an increase in Young's modulus and a decrease in the elongation at break; additionally, the compatibilizer promotes thermal degradation in a single step and gives the film a slight increase in thermal resistance. These results are attributed to an improved interaction in the interface of polyethylene and chitosan-poly(lactic acid), promoted by the compatibilizer.
使用合成聚合物与天然聚合物的混合物是减少塑料垃圾污染的一种潜在选择。在这项工作中，开发了用聚乳酸对壳聚糖进行化学改性的方法；然后，以聚乙烯接枝马来酸酐作为增容剂，通过挤出法制备了聚乙烯与壳聚糖 - 聚乳酸共混物的薄膜。分别在有和没有增容剂的情况下，能够获得壳聚糖含量最高为20 wt%和30 wt%的薄膜。扫描电子显微镜（SEM）分析表明所有薄膜表面均一。增容剂的添加对薄膜的力学性能有显著影响，例如杨氏模量增加和断裂伸长率降低；此外，增容剂促进热降解一步完成，并使薄膜的耐热性略有提高。这些结果归因于增容剂促进了聚乙烯与壳聚糖 - 聚乳酸界面处的相互作用改善。
