Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(<italic style="font-style: italic">ε</italic>-caprolactone)/Silica Nanocomposites

Xiang Liu; Wen-Zhi Cui; Wei Yu

doi:10.1007/s10118-022-2814-1

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Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites

RESEARCH ARTICLE | Updated：2022-10-25

- Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites
- Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites
- 高分子科学（英文版） 2022年40卷第11期页码：1451-1465
- Affiliations：
  
  Advanced Rheology Institute, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China
- Author bio：
  
  wyu@sjtu.edu.cn
- Funds：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 51625303 and 21790344).;Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-022-2814-1.
- DOI：10.1007/s10118-022-2814-1
  中图分类号：
- 收稿：2022-02-22，
  
  修回：2022-5-20，
  
  录用：2022-5-25，
  
  网络首发：2022-09-02，
  
  纸质出版：2022-11-01
- Accepted：
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Liu, X.; Cui, W. Z.; Yu, W. Interfacial chain entanglements induced melt memory effect in poly(ε-caprolactone)/silica nanocomposites. Chinese J. Polym. Sci. 2022, 40, 1451–1465

Xiang Liu, Wen-Zhi Cui, Wei Yu. Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1451-1465. DOI: 10.1007/s10118-022-2814-1.
Liu, X.; Cui, W. Z.; Yu, W. Interfacial chain entanglements induced melt memory effect in poly(ε-caprolactone)/silica nanocomposites. Chinese J. Polym. Sci. 2022, 40, 1451–1465 DOI： 10.1007/s10118-022-2814-1.

Xiang Liu, Wen-Zhi Cui, Wei Yu. Interfacial Chain Entanglements Induced Melt Memory Effect in Poly(ε-caprolactone)/Silica Nanocomposites[J]. Chinese Journal of Polymer Science, 2022, 40(11): 1451-1465. DOI: 10.1007/s10118-022-2814-1. DOI：

摘要

By blending SiO2 nanoparticles

the interfacial effect of its surface was used to retard the chain dynamics of PCL

leading to the enhanced melt memory effects of PCL. The relationship between particle dispersion

interfacial effect and crystallization rate and the melt memory effect of PCL was revealed.

Abstract

It is known that the enhanced melt memory effect is strongly correlated with the retarded chain dynamics. However

previous studies using differential scanning calorimetry (DSC) showed a weakened or even vanished melt memory in polymer nanocomposites

although adding nanoparticles in polymers often reduces chain mobility. In this work

we added two kinds of silica nanoparticles

O15 and W22 nanoparticles (with low and high surface silanol density

respectively)

to poly(

-caprolactone) (PCL)

where the degree of chain entanglements near nanoparticles increases

and chain dynamics is gradually retarded with increasing silica content. The strongly aggregated W22 nanoparticles show significant heterogeneous nucleation

while well-dispersed O15 nanoparticles exhibit very weak heterogeneous nucleation. In contrast to the restrained self-nucleation effects during the rapid non-isothermal crystallization of two nanocomposites

we found evident melt memory effects during the slow isothermal crystallization in PCL/O15 nanocomposites as indicated by DSC and polarized light microscopy (PLM) measurements. The melt memory becomes stronger with more O15 nanoparticles

but depends non-monotonically on the loadings of W22 nanoparticles. The lifetime of the melt memory effects matches the chain re-entanglement time of the SN melts of nanocomposites

which is consistent with our previous work on PCL miscible blends. The complicated influence of silica on nucleation and crystal growth is induced by the spatial inhomogeneity of chain entanglements in the silica-filled PCL system. The decrease in the entanglement density of the interfacial chains in the SN melts of nanocomposites is conducive to nucleate under slow isothermal crystallization

but the chain mobility is still greatly restrained by the nanoparticles

causing the slow growth rate of spherulites and the difficulty to form nuclei under fast non-isothermal crystallization.

关键词

Keywords

references

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DOI：10.1007/s10118-022-2814-1

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