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Step-Growth Polymerization: Overview

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...

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Updated: Jul 11, 2025

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

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Published on: October 10, 2013

具有可变湿度的颗粒聚合物联合用于使用简单的混合方法构建bijels.

Liya Zhang¹, Yanmei Tian¹, Aixin Song¹

¹Key Laboratory of Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, China.

Langmuir : the ACS journal of surfaces and colloids

|November 7, 2023

概括

研究人员开发了一种更简单的方法,使用纤维素纳米晶和聚合物复合物制造双连续乳液凝 (bijels). 这种创新简化了制造,并为大规模的工业应用提供了潜力.

科学领域:

材料科学材料科学材料科学
合体和表面化学
纳米技术纳米技术

背景情况:

双连续乳液凝 (bijels) 是具有相互连接的流体域的先进材料,可用于各种应用的高效质量运输.
传统的通过旋分解生产的比耶尔需要严格的温度控制,并限制材料选择.
为更广泛的工业采用,开发更简单,更通用的bijel制造方法至关重要.

研究的目的:

开发一种直接混合的方法来构建比耶尔,绕过传统的旋分解的局限性.
通过将它们与性聚合物结合,设计可控制的纤维素纳米晶体 (CNC) 接口湿度.
用这些工程粒子来证明Pickering乳液类型的可调的形成,包括 bijels.

主要方法:

在水性纤维素纳米晶体 (CNC) 与疏水性氨基末聚甲基 (PDMS-NH2) 的现场组合形成CNC@mPDMS-NH2复合体.
在水-多烯接口上对CNC@mPDMS-NH2复合物的吸附,以调整接口性能.
采用直接混合方法来制造贝尔,然后使用3D扫描和曲率计算进行表征.

主要成果:

通过使用简化直接混合方法成功制造了bijel,避免了精确的温度控制.
通过调整 CNC@mPDMS-NH2 复合体的接口特性,证明了调整皮克林乳液类型 (油入水,比耶尔,油入水) 的能力.

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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

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Published on: February 27, 2016

Microbubble Fabrication of Concave-porosity PDMS Beads

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

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Last Updated: Jul 11, 2025

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

Published on: October 10, 2013

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

Microbubble Fabrication of Concave-porosity PDMS Beads

Microbubble Fabrication of Concave-porosity PDMS Beads

Published on: December 15, 2015

通过先进的成像和计算技术验证了获得的bijels的双连续结构.

结论:

直接混合方法提供了一种简化和可扩展的方法来制造bijel.
工程化CNC聚合物复合物为控制乳液结构提供可调节的接口特性.
这项工作扩大了用于稳定bijels的颗粒的范围,并为大规模制造提供了一个有前途的途径.