Bond-Reversibility Effects on Self-Crowding of Unimacromolecular Nano-Objects.

IF 5.2 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2025-09-11 DOI:10.1021/acsmacrolett.5c00512

Ainara Ruiz-Bardillo,Isabel Asenjo-Sanz,Ester Verde-Sesto,Lionel Porcar,Joachim Kohlbrecher,José A Pomposo,Angel J Moreno,Arantxa Arbe,Juan Colmenero

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Abstract

The scaling behavior of linear chains with reversible bonds and, in particular, its dependence on the concentration are fundamental problems of polymer physics that are not fully understood. By means of small-angle neutron scattering we investigate the conformations of reversibly bonding polymers from high dilution (where they form unimacromolecular nano-objects, usually known as single-chain nanoparticles) to crowded solutions and bulk state far above the overlap concentration (where they are expected to form a dynamic polymer network). Unlike the cases of simple linear chains with no bonds and of chains with strictly intramolecular irreversible bonds, no shrinkage is found, and the size and scaling exponent of the reversibly bonding polymers are essentially unperturbed by crowding. This is a relevant result that confirms the negligibility of many-body effects beyond the overlap concentration in crowded systems of reversibly bonding polymers and the validity of ultrasoft effective interactions for predicting their structural and phase behavior.

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单大分子纳米物体自拥挤的键可逆性效应。

具有可逆键的线性链的缩放行为，特别是其对浓度的依赖，是聚合物物理学的基本问题，尚未完全理解。通过小角度中子散射，我们研究了可逆键合聚合物的构象，从高稀释（形成单分子纳米物体，通常称为单链纳米粒子）到拥挤溶液和远高于重叠浓度的大块状态（在那里它们有望形成动态聚合物网络）。与没有键的简单线性链和具有严格分子内不可逆键的链的情况不同，没有发现收缩，可逆键聚合物的大小和缩放指数基本上不受拥挤的影响。这是一个相关的结果，证实了在可逆键合聚合物拥挤系统中超过重叠浓度的多体效应可以忽略不计，以及超软有效相互作用在预测其结构和相行为方面的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.