writer：Chunjiang Xu, Defeng Wu, Qiaolian Lv, Lili Yan
keywords：Poly(ε-caprolactone); Cellulose Nanocrystal; Composites; Compatibility; Crystallization Temperature
source：期刊
specific source：Journal of Physical Chemistry C
Issue time：2017年

Journal of Physical Chemistry C, 2017, 121, 18615-18624  

ABSTRACT:

Poly(ε-caprolactone) composites containing the acetylated cellulose nanocrystal (aCNC) with various degrees of substitution (DS) were prepared for the phase compatibility study. An interesting phenomenon around the alteration of crystallization temperature (T_c) was reported here. T_c of PCL increases evidently in the presence of pristine CNC (DS=0) due to its nucleation effect. But for the composites with aCNCs, T_c decreases monotonously with increasing DSs of aCNCs, and is even lower than that of the neat PCL at higher DSs. This is attributed to the improved compatibility between the matrix and particles, which is further evaluated by the Flory-Huggins parameters. Therefore, the alteration of T_c can be used as the probe to detect the compatibility between two phases in aliphatic polyester composites with chemically modified CNCs. From another perspective, crystallization of aliphatic polyesters can be controlled using aCNCs with different DSs.

PDF DOWNLOAD:

http://pubs.acs.org/doi/10.1021/acs.jpcc.7b05055