Department of Materials Science and Engineering, China University of Petroleum, 102249 Beijing, PR China.
Department of Materials Science and Engineering, China University of Petroleum, 102249 Beijing, PR China.
Carbohydr Polym. 2018 Jun 1;189:99-106. doi: 10.1016/j.carbpol.2018.02.025. Epub 2018 Feb 10.
Cellulose nanocrystals (CNCs) are nature-resourced nanoparticles and have been widely used to improve performance of biodegradable polyesters. Two types of CNCs respectively prepared by sulphuric acid hydrolysis (aCNCs) and ammonium persulfate oxidation (oCNCs) processes were incorporated into poly(butylene adipate) (PBA) matrix to regulate its crystallization behavior and enzymatic degradation performance. Thermal and X-ray diffraction analysis revealed that both aCNCs and oCNCs could promote the crystallization ability and lamellar thickening of α-form PBA, while oCNCs showed stronger promotion than aCNCs. Optical morphology study indicated that both two types of CNCs enhanced the nucleation ability of PBA. Furthermore, the mechanism of crystallization promotion of CNCs on PBA was further discussed and attributed to the "memory effect" in the melt state of PBA/CNCs composites, which was originated from the hydrogen-bonding interaction between CNCs and PBA chains. The enzymatic degradation testing proved that CNCs could slower down degradation rate of PBA and PBA/oCNCs composites possessed lower degradation rate than PBA/aCNCs composites.
纤维素纳米晶体（CNCs）是一种天然来源的纳米颗粒，已被广泛用于改善可生物降解聚酯的性能。通过硫酸水解（aCNCs）和过硫酸铵氧化（oCNCs）两种方法制备的两种类型的 CNCs 分别被掺入聚丁二酸丁二醇酯（PBA）基体中，以调节其结晶行为和酶降解性能。热分析和 X 射线衍射分析表明，aCNCs 和 oCNCs 均能促进 α 晶型 PBA 的结晶能力和片层增厚，而 oCNCs 的促进作用强于 aCNCs。光学形貌研究表明，两种类型的 CNCs 均增强了 PBA 的成核能力。此外，进一步探讨了 CNCs 对 PBA 结晶促进作用的机理，归因于 PBA/CNCs 复合材料在熔融状态下的“记忆效应”，这源于 CNCs 与 PBA 链之间的氢键相互作用。酶降解测试证明，CNCs 可以降低 PBA 的降解速率，而 PBA/oCNCs 复合材料的降解速率低于 PBA/aCNCs 复合材料。
