Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, CEP 13565-905, Sao Carlos, SP, Brazil.
Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, CEP 13565-905, Sao Carlos, SP, Brazil; University of Ilorin, Materials and Metallurgical Engineering Department (MME), PMB 1515, Ilorin, Nigeria.
Carbohydr Polym. 2021 Apr 15;258:117732. doi: 10.1016/j.carbpol.2021.117732. Epub 2021 Jan 30.
A novel processing technique involving Solid-State Shear Pulverization (SSSP) was used to produce thermoplastic starch (TPS) and Poly (Butylene Adipate-co-Terephthalate) (PBAT) films to improve processability and produce well-dispersed blends. Four different compositions (50-80 wt% TPS content) were processed using two different production routes. In one instance, the compositions were pre-treated by SSSP before melt extrusion (SSSPE). Secondly, starch was initially plasticized and thereafter blended with PBAT by melt extrusion (EXT) method. Flat films were produced using both routes and processability, visual and tactical aspects, mechanical and optical properties, crystallinity, and water absorption behavior were evaluated. High starch content films (70 and 80 wt%) prepared based on SSSP incorporation showed easier processability, and better visual aspect and mechanical integrity than EXT ones. However, EXT films with 50 and 60 wt% of starch presented higher elongation at break and lower water absorption due to finer dispersion of TPS and better starch plasticization.
采用固态剪切粉碎（SSSP）的新型加工技术来制备热塑性淀粉（TPS）和聚对苯二甲酸丁二醇酯-己二酸丁二醇酯（PBAT）薄膜，以提高加工性能并制备分散良好的共混物。使用两种不同的生产路线加工了四种不同的组成（50-80wt% TPS 含量）。在一种情况下，通过 SSSP 对组合物进行预处理，然后进行熔融挤出（SSSPE）。其次，通过熔融挤出（EXT）方法将淀粉最初塑化，然后与 PBAT 共混。使用两种方法制备了扁平薄膜，并评估了加工性能、外观和力学性能、光学性能、结晶度和吸水性。基于 SSSP 掺入的高淀粉含量（70 和 80wt%）薄膜表现出更容易的加工性能、更好的外观和机械完整性，而 EXT 薄膜则具有更好的淀粉塑化和更细的 TPS 分散，表现出更高的断裂伸长率和更低的吸水率。
