Department of Wood Engineering and Technology, Gorgan University of Agricultural Sciences & Natural Resources, Gorgan, Iran.
Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), P.O. Box 33535111, Tehran, Iran.
Carbohydr Polym. 2018 Oct 1;197:305-311. doi: 10.1016/j.carbpol.2018.06.017. Epub 2018 Jun 6.
The present work reports the effect of cellulose nanofibers (CNFs) on the thermal, dynamic mechanical analysis (DMA), density and water uptake of thermoplastic starch (TPS) foamed composites. The obtained thermal and DMA results illustrate that thermal stability, storage modulus (E'), loss modulus (E″) and damping factor (tan δ) increase for all TPS/CNF samples compared to the pure TPS foamed composite. The results showed that the incorporation of CNFs caused an increase in the glass transition temperature (T) of the TPS foamed composites. Additionally, thermal results revealed that 1.5 wt% CNF offers superior resistance or stability towards heat compared to its counterparts. Addition of the CNF filler into the TPS matrix decreased the apparent density and water absorption. Interestingly, SEM images illustrate that when a small content of rigid nano particles (1.0 or 1.5 wt%) was added in the foamed composites, the cell size decreased while the cell density increased.
本工作研究了纤维素纳米纤维（CNFs）对热塑性淀粉（TPS）发泡复合材料的热性能、动态力学分析（DMA）、密度和吸水率的影响。所得热学和 DMA 结果表明，与纯 TPS 发泡复合材料相比，所有 TPS/CNF 样品的热稳定性、储能模量（E'）、损耗模量（E"）和损耗因子（tan δ）均有所提高。结果表明，CNFs 的加入导致 TPS 发泡复合材料的玻璃化转变温度（T）升高。此外，热学结果表明，与其他 CNF 相比，1.5wt% CNF 对热具有更好的抗性或稳定性。将 CNF 填料加入 TPS 基体中会降低表观密度和吸水率。有趣的是，SEM 图像表明，当在发泡复合材料中加入少量刚性纳米颗粒（1.0 或 1.5wt%）时，泡孔尺寸减小，而泡孔密度增加。
