Microstructure of bottlebrush poly(n-alkyl methacrylate)s beyond side chain packing

Based on results of small and wide angle X-ray scattering measurements, we report a new microstructural feature in bottlebrush poly (n-alkyl methacrylate)s larger than side chain packing. Temperature dependent X-ray experiments confirmed that such large scale aggregation structure is originated from...

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Bibliographic Details
Published in:Polymer (Guilford) 2020-12, Vol.210, p.123034, Article 123034
Main Authors: Xiang, Mingyue, Lyu, Dong, Qin, Yanan, Chen, Ran, Liu, Lingzhi, Men, Yongfeng
Format: Article
Language:English
Subjects:
Aggregating structure
Bottlebrushes
Chains
Crystallization
Crystallization behavior
Density
Entanglement
Microstructure
Poly (n-alkyl methacrylate)s
Small angle X ray scattering
Temperature dependence
X-ray scattering
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Summary:Based on results of small and wide angle X-ray scattering measurements, we report a new microstructural feature in bottlebrush poly (n-alkyl methacrylate)s larger than side chain packing. Temperature dependent X-ray experiments confirmed that such large scale aggregation structure is originated from the crystallization of the side chains. Two-dimensional X-ray scattering patterns revealed that the structure is due to the formation of disordered regions locate on average two layers of well crystallized side chains apart. Crystallization of the side chains rejected backbone entanglements to the surrounding area forming regions of high entanglement density so that restricting the crystallization of side chains. As such a density contrast is created between the crystallized regions and the disordered ones which results in strong small angle X-ray scattering signals. [Display omitted] •Amorphous regions exists in poly (n-alkyl methacrylate)s with scale larger than the side chain packing.•The amorphous regions are correlated with a distance over two layers of well crystallized side chains on average.•Enriched entanglements and backbone-backbone expansion lead to the formation of amorphous regions.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2020.123034