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Side-chain Crystallization in Alkyl-Substituted Cellulose Esters and Hydroxypropyl Cellulose Esters

Side-chain Crystallization in Alkyl-Substituted Cellulose Esters and Hydroxypropyl Cellulose Esters

Xi Chen, Nan Zheng, Qiao Wang, Lingzhi Liu, Yongfeng Men

Carbohydr Polym. 2017 Apr 15;162:28-34.

PMID: 28224891

Abstract:

The differences in side chain crystallization behavior between cellulose esters (CEs) and hydroxypropyl cellulose esters (HPCEs) were systematically investigated by a combination of differential scanning calorimetry (DSC) and small and wide-angle X-ray scattering techniques. DSC investigation indicated that under the same side chain length, the fusion enthalpy and the number of crystallized CH2 of CEs were smaller than HPCEs. At the same time, their d-spacing and molecular arrangements were also different from each other. For the CEs, the side chains are perpendicular to the main chain, while the side chains most probably tend to tilt to main chain in the HPCEs as was evidenced by X-ray scattering results. The phenomenon can be understood as a consequence of different flexibility of attachment bridges in both kinds of side chain polymers and the steric hindrance of methyl group in the hydroxypropyl group in HPCEs. In addition, the added hydroxypropyl substituents make the side chain length increasing.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9004642	Hydroxypropyl cellulose		9004-64-2	Price

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