In the present study, biocomposite films from cellulose nanocrystals (CNCs) were obtained by the solution casting method. CNCs were isolated from pineapple crown using chemical treatments followed by sulfuric acid hydrolysis and added into poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) matrix. The effect of freeze-dried CNC content (1, 3, and 5 wt%) on the structural, crystallization, thermal degradation lifetime prediction, and thermogravimetric simulation was investigated. An irreversible agglomeration observed after freeze-dried provided changes in the morphology and size of CNCs. Addition up to 3 wt% of CNCs increased the thermal stability, crystallization rate, and crystallinity index of PHBV, as showed by thermal and crystallinity analysis, respectively. The kinetic degradation study by thermogravimetric analysis (TGA) was done using the F-test method by statistically comparing degradation mechanisms in the solid-state. The most probable degradation mechanism was the autocatalytic reaction model for all samples (represented by C_n and B_na-types) with a suitable adjustment of the simulated curves. Lifetime prediction showed to be successfully applied based on the kinetic analysis, and PHBV reinforced with 3 wt% of CNCs presents the highest results for the isothermal temperature of 180 °C.

在本研究中，通过溶液流延法获得了纤维素纳米晶体（CNC）的生物复合膜。通过化学处理从菠萝冠中分离CNC分子，然后进行硫酸水解，然后将其添加到聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（PHBV）基质中。研究了冷冻干燥的CNC含量（1、3和5 wt％）对结构，结晶，热降解寿命预测和热重模拟的影响。冷冻干燥后观察到的不可逆的聚集提供了CNCs的形态和尺寸的变化。如热分析和结晶度分析所示，最多添加3 wt％的CNCs可以提高PHBV的热稳定性，结晶速率和结晶度指数。通过热重分析（TGA）进行动力学降解研究是使用F检验方法，通过统计比较固态降解机理进行的。最可能的降解机理是所有样品的自动催化反应模型（用C表示）。_n和B _na型），并适当调整模拟曲线。在动力学分析的基础上，寿命预测已成功应用，并且以180％C的等温温度用3 wt％的CNC增强的PHBV表现出最高的结果。