Biodegradable potato starch/PVA samples containing different concentrations of rosin were prepared by melt-mixing in order to study the enhancement of the properties of native starch films. Glycerol and polyvinyl alcohol (PVA) are commonly used as plasticizers of starch. Their relatively low molecular weight (compared with starch) contributes to a good processability. Rosin is a renewable product whose incorporation in the starch/PVA matrix induces processing aid and reinforcing effects. Its relatively high molecular weight might prevent its migration to the surface of the final product. Water content, solubility in water, mechanical properties, microstructure and dynamic mechanical analysis of the samples were studied. The addition of 8% rosin to starch/PVA blends led to tensile strength values higher than 10 MPa and elongation at break values close to 2000%, values comparable to those offered by conventional polymers used in food packaging, for example LDPE. Furthermore, starch compounds have low cost and high biodegradability.

通过熔融混合制备了可生物降解的马铃薯淀粉/ PVA样品，其中包含不同浓度的松香，以研究天然淀粉膜性能的增强。甘油和聚乙烯醇（PVA）通常用作淀粉的增塑剂。它们相对较低的分子量（与淀粉相比）有助于良好的加工性能。松香是一种可再生产品，其在淀粉/ PVA基质中的引入可诱导加工助剂和增强作用。它相对较高的分子量可能会阻止其迁移到最终产品的表面。研究了样品的水含量，在水中的溶解度，力学性能，微观结构和动态力学分析。向淀粉/ PVA共混物中添加8％松香会导致拉伸强度值高于10 MPa，断裂伸长率值接近2000％，该值可与食品包装中使用的常规聚合物（例如LDPE）相媲美。此外，淀粉化合物具有低成本和高生物降解性。