均聚物分子量对处于三维球形受限空间中的二嵌段共聚物的影响。

Effects of the homopolymer molecular weight on a diblock copolymer in a 3D spherical confinement.

作者信息

Ly Dung Q, Makatsoris Charalampos

机构信息

1School of Physical Sciences and Computing, University of Central Lancashire, Preston, UK.

2School of Aerospace, Transportation and Manufacturing, Cranfield University, Cranfield, UK.

出版信息

BMC Chem. 2019 Feb 14;13(1):24. doi: 10.1186/s13065-019-0541-7. eCollection 2019 Dec.

DOI:10.1186/s13065-019-0541-7

PMID:31384773

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6661751/

Abstract

The morphologies of a diblock copolymer spherically confined within a homopolymer were investigated by using the static self-consistent field theory method. A homogeneous - diblock copolymer sphere was surrounded by a homopolymer . Upon changing the diblock volume fraction, homopolymer molecular weight and the interaction between the copolymer and its surrounding environment, different morphologies of the sphere were observed. Our calculations confirmed that when the homopolymer molecular weight was high a complete macrophase separation between the copolymer and the homopolymer was obtained. However, when the homopolymer molecular weight was low the homopolymer penetrated into the copolymer microdomains, diluting the diblock copolymer and reduced the interaction between the diblock copolymer segments and hence preventing them from segregating.

摘要

利用静态自洽场理论方法研究了球形受限在均聚物中的二嵌段共聚物的形态。一个均相的二嵌段共聚物球被均聚物包围。通过改变二嵌段体积分数、均聚物分子量以及共聚物与其周围环境之间的相互作用，观察到了球的不同形态。我们的计算证实，当均聚物分子量较高时，共聚物和均聚物之间会发生完全的宏观相分离。然而，当均聚物分子量较低时，均聚物会渗透到共聚物微区中，稀释二嵌段共聚物，并降低二嵌段共聚物链段之间的相互作用，从而阻止它们发生相分离。