利用聚乙烯醇结晶辅助制备多重交联的高强度聚丙烯酰胺水凝胶

时富宽; 钟鸣; 张丽琴; 刘晓颖; 谢续明

doi:10.11777/j.issn1000-3304.2017.16162

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利用聚乙烯醇结晶辅助制备多重交联的高强度聚丙烯酰胺水凝胶

研究论文 | 更新时间：2021-03-19

- 利用聚乙烯醇结晶辅助制备多重交联的高强度聚丙烯酰胺水凝胶
- Preparation of Hierachically Crosslinked Poly (acrylamide) Hydrogels by Assistance of Crystallization of Poly (vinyl alcohol)
- 高分子学报 2017年第3期页码：491-497
- 作者机构：
  
  清华大学化工系先进材料教育部重点实验室北京 100084
- 作者简介：
  
  E-mail: xxm-dce@tsinghua.edu.cnXu-ming Xie, E-mail: xxm-dce@tsinghua.edu.cn
- 基金信息：
  
  国家自然科学基金(21474058);清华大学自主科研计划项目(2014Z22069);北京化工大学有机-无机复合材料国家重点实验室(OIC-201601006);东华大学纤维材料改性国家重点实验室开放基金(LK1404)
- DOI：10.11777/j.issn1000-3304.2017.16162
  中图分类号：
- 纸质出版日期：2017-3，
  
  收稿日期：2016-5-4，
  
  修回日期：2016-6-13，
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时富宽, 钟鸣, 张丽琴, 刘晓颖, 谢续明. 利用聚乙烯醇结晶辅助制备多重交联的高强度聚丙烯酰胺水凝胶[J]. 高分子学报, 2017,(3):491-497.

Shi Fu-kuan, Zhong Ming, Zhang Li-qin, Liu Xiao-ying, Xie Xu-ming. Preparation of Hierachically Crosslinked Poly (acrylamide) Hydrogels by Assistance of Crystallization of Poly (vinyl alcohol)[J]. Acta Polymerica Sinica, 2017,(3):491-497.
时富宽, 钟鸣, 张丽琴, 刘晓颖, 谢续明. 利用聚乙烯醇结晶辅助制备多重交联的高强度聚丙烯酰胺水凝胶[J]. 高分子学报, 2017,(3):491-497. DOI： 10.11777/j.issn1000-3304.2017.16162.

Shi Fu-kuan, Zhong Ming, Zhang Li-qin, Liu Xiao-ying, Xie Xu-ming. Preparation of Hierachically Crosslinked Poly (acrylamide) Hydrogels by Assistance of Crystallization of Poly (vinyl alcohol)[J]. Acta Polymerica Sinica, 2017,(3):491-497. DOI： 10.11777/j.issn1000-3304.2017.16162.

摘要

在表面带有C=C双键的乙烯基杂化二氧化硅纳米颗粒（vinyl hybrid silica nanoparticle，VSNP）上接枝丙烯酰胺（AM），所得到的纳米刷状凝胶因子通过聚丙烯酰胺（PAM）间的氢键形成物理交联点，则多官能化的VSNP可作为拟共价交联点构筑双重交联的单一网络纳米复合物理水凝胶（nanocomposite physical hydrogel，NCP gel），表现出较高的强度和超拉伸性.为了进一步提高凝胶的强度和韧性，将少量PVA和PAM/VSNP纳米刷混合制成凝胶，通过冷冻-融化处理，使与PAM分子链相互缠绕并形成氢键作用的PVA结晶，形成新的交联点进一步交联PAM NCP gel，得到多交联的PAM NCP gel体系.通过拉曼光谱和示差扫描量热分析，证明凝胶中的PVA通过氢键既可以与PAM相互作用，又形成微晶为新交联点，大大增强了NCP gel的力学性能，与PAM NCP gel相比，凝胶的拉伸强度和断裂能分别从313 kPa和1.41×10

J/m

提高到了557 kPa和4.65×10

J/m

Abstract

The grafting polymerization of acrylamide (AM) on the surface of vinyl hybrid silica nanoparticles (VSNPs) leads to the formation of nanobrush gelators. The gelators can link with each other by the hydrogen bond among the grafted polyacrylamide (PAM) chains as physical crosslinking points

and thus the multifunctional VSNPs as analogous covalent crosslinking points to construct dually crosslinked single network nanocomposite under the form of physical hydrogels (NCP gels)

which exhibit high strength and super stretchability. Under stretching

the hydrogen bonds in the PAM NCP gel could dissipate energy and homogenize the network by their break and recombination process; VSNPs could retain the original configuration of the gel and work as transferring centers to homogenize the stress distribution in the gel network. As a result

the synergy of the dual crosslinking points ensures the PAM NCP gel to exhibit high strength and super stretchability. Polyvinylalcohol (PVA) is hydrophilic and compatible with PAM. PVA could physically interact with PAM by forming hydrogen bonds and also crystallize after freezing-thawing (FT) process. To further improve the strength and toughness of the NCP gels

the mixtures of PVA and the PAM/VSNP gelators are prepared and then treated by FT process. Thus PVA interacted with the grafted PAM chains could form micro-crystals

playing the role of new junction points to crosslink further the gel network. Thereby hierachically crosslinked PAM NCP gels are obtained. According to the characterization of Raman spectra and DSC

it is verified that PVA could form micro-crystal and interact with PAM by hydrogen bond

leading to toughen NCP gel network. Compared to the PAM NCP gel

the PVA/PAM NCP gels exhibit greatly improved mechanical properties due to the enhanced synergy of the hierachical crosslinking points. The tensile strength and fracture energy of the gels are enhanced from 313 kPa to 557 kPa and from 1.41×10

J/m

to 4.65×10

J/m

respectively.

关键词

聚乙烯醇微晶多重交联高强度聚丙烯酰胺水凝胶

Keywords

PolyvinylalcoholMicro-crystalHierarchical crosslinkingHigh strengthPoly(acrylamide) hydrogel

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