Remarkable thermoplasticity of branched cellulose copolymers: Graft-chain-dependent structural transition and thermoplasticity
- Authors
- Lee, W.; Ahn, Y.; Chung, J.W.; Kwak, S.-Y.
- Issue Date
- 1-Jun-2021
- Publisher
- Elsevier Ltd
- Keywords
- Alkyl-branched graft copolymers; Crystalline structure; Hydrogen bonding; Microcrystalline cellulose; Thermoplasticity; ε-Decalactone
- Citation
- Carbohydrate Polymers, v.261
- Journal Title
- Carbohydrate Polymers
- Volume
- 261
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/40703
- DOI
- 10.1016/j.carbpol.2021.117862
- ISSN
- 0144-8617
- Abstract
- In this study, we designed novel methods to prepare a cellulose graft copolymer series (Cell-g-PDLs) with varied graft chain lengths, via direct ring-opening polymerization (ROP) of unmodified cellulose with alkyl-branched lactones. With increasing alkyl-branched graft chain length of the Cell-g-PDLs, the crystalline phase of cellulose became increasingly weakened, while the glass transition temperature significantly decreased. The latter was attributed to the extended free volume derived from the increased chain end-group concentrations of the branched graft chains. These results suggested that the incorporation of a highly alkyl-branched graft chain into unmodified cellulose is an effective way to improve its thermo-plasticity. Notably, the Cell-g-PDL with the longest graft chain (Cell-g-PDL9) was demonstrative of highly sufficient thermo-plasticity, owing to the enhanced molecular mobility resulting from the reduced frictional forces between the cellulose molecules. © 2021
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