Preparation of Micelles and Gels <italic style="font-style: italic">via</italic> Polymerization of Pre-assembled Styrene and Polyacrylic Acid

Wu Qiong; Xu Peng-xiang; Wang Li-quan; Cai Chun-hua; Lin Jia-ping; Lu Ying-qing; Tian Xiao-hui

doi:10.11777/j.issn1000-3304.2017.16120

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Preparation of Micelles and Gels via Polymerization of Pre-assembled Styrene and Polyacrylic Acid

Research Article | 更新时间：2021-03-19

- Preparation of Micelles and Gels via Polymerization of Pre-assembled Styrene and Polyacrylic Acid
- Acta Polymerica Sinica Issue 3, Pages: 471-481(2017)
- 作者机构：
  
  华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室上海 200237
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.16120
  CLC：
- Published：2017-3，
  
  Received：6 April 2016，
  
  Revised：26 April 2016，
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Wu Qiong, Xu Peng-xiang, Wang Li-quan, Cai Chun-hua, Lin Jia-ping, Lu Ying-qing, Tian Xiao-hui. Preparation of Micelles and Gels via Polymerization of Pre-assembled Styrene and Polyacrylic Acid. [J]. Acta Polymerica Sinica (3):471-481(2017)
DOI：

Wu Qiong, Xu Peng-xiang, Wang Li-quan, Cai Chun-hua, Lin Jia-ping, Lu Ying-qing, Tian Xiao-hui. Preparation of Micelles and Gels via Polymerization of Pre-assembled Styrene and Polyacrylic Acid. [J]. Acta Polymerica Sinica (3):471-481(2017) DOI： 10.11777/j.issn1000-3304.2017.16120.

摘要

通过苯乙烯和丙烯酸单体的预组装再聚合的制备方法，在不改变共聚物浓度的前提下制备了共聚物胶束溶液和凝胶，探讨了引发剂（偶氮二异丁腈）浓度对生成的共聚物的聚集体结构以及分子结构的影响.利用核磁共振氢谱、扫描电子显微镜和透射电子显微镜等表征了共聚物的分子结构和聚集行为，此外，借助耗散粒子动力学方法模拟了该体系，辅助实验阐明了不同引发剂浓度下生成的共聚物聚集体结构及相对应的共聚物分子结构，在此基础上，利用动态机械热分析和流变学的表征技术，研究了共聚物胶束溶液和凝胶的流变特性.结果表明，在单体浓度不变的情况下，高引发剂浓度时该体系趋于形成平均嵌段长度较长的两嵌段共聚物，生成稳定的胶束溶液，而低引发剂浓度时趋于形成交替共聚物，得到物理凝胶，耗散粒子动力学模拟得到了与实验一致的结果.流变学表征发现胶束体系和凝胶体系均呈现剪切变稀行为，并确定了凝胶体系的凝胶点及恢复性.

Abstract

Micelles and hydrogels

generally prepared at different concentrations in waters

arouse great interest due to their wide application. However

it is inconvenient and difficult to prepare the micelles and hydrogels at the same concentrations. In this work

different states of a same copolymer

such as micelle solutions and hydrogels

are prepared

via

the polymerization of the pre-assembled acrylic acid and styrene with the same monomer compositions at the same concentrations. The influence of initiator (azodiisobutyronitrile) concentration on the structures of the aggregates is investigated

and the corresponding molecular structures of the copolymers are studied by nuclear magnetic resonance and dynamic thermomechanical analysis

whereas the morphology of the aggregates is characterized by scanning electron microscope and transmission electron microscope. As a supplement to the experiment

dissipative particle dynamics simulation is further performed to reveal the aggregate structures and the corresponding molecular structures of the copolymers. It is found that

under the same concentration of acrylic acid and styrene

the system with a higher initiator concentration (7.0×10

mol/L) tend to form stable spherical micelles of 50 nm diameter

in which the copolymers have longer blocks; while that with a lower initiator concentrations (such as 7.0×10

mol/L) tend to form network hydrogels

in which the copolymers have alternated and shorter blocks. Both the dynamic thermomechanical analysis and the simulation results demonstrate that the diblock copolymers and multiblock copolymers are synthesized at the higher and the lower initiator concentration. The different aggregate structures are originated from the different molecular structures. In addition

rheological characterization techniques are employed to investigate the rheological properties of the solutions and the hydrogels to clarify the relations between the properties and the molecular/aggregate structures. The rheological characterization showed the shear thinning non-Newtonian behaviour for both the micelle solutions and the hydrogels

and the gel-point of hydrogels was determined to be at the concentration of 22 wt%. It is found that the hydrogels are recoverable after destruction by large amplitude oscillatory shear. The work can serve as an example to clarify the role of the polymer microstructure in determining the material properties and to provide guides for constructing materials with the similar composition but different aggregate structure.

关键词

自组装聚合凝胶胶束耗散粒子动力学

Keywords

Self-assemblyPolymerizationGelsMicellesDissipative particle dynamics

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Department of Orthopedics, Shanghai Tenth People's Hospital, Tongji University School of Medicine

Department of Polymeric Materials, School of Materials Science and Engineering, Tongji University

Shanghai Key Laboratory of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University

Department of Polymer Science and Engineering, Zhejiang University

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Preparation of Micelles and Gels via Polymerization of Pre-assembled Styrene and Polyacrylic Acid

DOI：10.11777/j.issn1000-3304.2017.16120

摘要

Abstract

关键词

Keywords

references