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Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Updated: Sep 17, 2025

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

Published on: February 7, 2021

分子屏蔽,按需,超声波炼的聚合物网络.

Adrian A Lorenzana¹, Hsu Shwe Yee Naing¹, Jichao Song¹

¹Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

|July 2, 2025

概括

研究人员开发了对超声波敏感的聚合物,可以根据需求从液态过渡到固体. 这项创新为热或光敏感应用提供了对凝的精确控制.

关键词:

环氧化物是一种氧化物.甲基酸盐是什么甲基酸盐聚乙烯糖醇 (PEG) 是一种

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Last Updated: Sep 17, 2025

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

Published on: February 7, 2021

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

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Published on: January 8, 2014

Assembly and Characterization of Polyelectrolyte Complex Micelles

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Published on: March 2, 2020

科学领域:

聚合物化学聚合物化学
材料科学材料科学材料科学
生物材料工程生物材料工程

背景情况:

聚合物网是多功能材料,用于从水凝到粘合剂的各种应用.
传统的交叉连接方法涉及热或高能光,限制它们在敏感应用中的使用.
机械力是一种较新的方法,用于诱导先前存在的聚合物网络中的交叉链接.

研究的目的:

开发一种新的策略,通过机械变形和超声波来诱导液体到固体的交叉连接.
合成和描述具有超声响应交叉连接能力的移植共聚合物.
为了证明在超声波应用后聚合物溶液的快速凝.

主要方法:

合成具有聚乙烯甘醇 (PEG) 侧链的移植共聚合物,以屏蔽反应性环氧化物组.
聚合物溶液的配方,在不受干扰的条件下保持液态.
超声波的应用以启动快速凝 (从液体到固体的过渡).

主要成果:

对超声波敏感的聚合物与受保护的环氧化物组成功合成.
聚合物溶液作为液体保持稳定,直到暴露于超声波.
在超声波应用后20秒内开始凝.
开发的聚合物适用于对光和热敏感的应用.

结论:

已经建立了一种使用超声波控制聚合物网络形成的新方法.
超声波诱导的凝可以精确控制交叉连接的时间.
这些材料为需要特定凝触发器的应用提供了有希望的替代品.
屏蔽策略有效地保护反应组,直到超声波激活.