Mechanical sensitivity of macroporous poly(vinyl formal) hydrogels to water content

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	Mechanical sensitivity of macroporous poly(vinyl formal) hydrogels to water content
	Y. Zeng; R. C. Wang; B. L. Zhou
	2005
发表期刊	Acta Polymerica Sinica
ISSN	1000-3304
期号	3 页码:363-367
摘要	Smart hydrogels have been applied widely as sensors and actuators in many fields, such as artificial muscles, drug control release, fluid control and so on. However, their further applications have been hindered by the slow respond rate and the critical surrounding medium. A macroporous nonionic poly ( vinyl formal) hydrogel (PVFM) sensitive to water content, was synthesized by adding pore-forming agent. It showed a satisfied swelling/deswelling rate with the change in water content due to the presence of interconnecting pores. The swelling pressure of this hydrogel in water may reach its maximum within 80 s, and the deswelling pressure of the swollen hydrogel may decrease to 5% of its initial value within 4 h in the process of air-drying. Comparing with the conventional dense hydrogel, the macroporous PVFM showed many different behaviors, the volume did not decrease with the loss of water, but a phenomenon of volume recovery occurred during the air-drying process. On the other hand, the compressive modulus of the macroporous hydrogel did not increase monotonously with the decrease of water content as that of conventional hydrogels did, but decreased about 47% at the initial stage of drying process. This abnormal behavior is mainly related to the load-bearing modes of macroporous gels is with different water contents. The rapid response of macroporous gels is attributed to the weaker interaction between polymer and water, the higher porosity and the elasticity recovery of network. Since the macroporous PVFM hydrogels show the rapid swelling/deswelling rate and the satisfied sensitivity of mechanical properties to water content, they have the large potentialities to be used as sensors and actuators in flow control I humidity control and so on.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;zeng, y (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Macroporous Hydrogels Water Content Mechanical Behavior Poly(Vinyl Formal) Gels Channels Behavior Devices Ratio
URL	查看原文
WOS记录号	WOS:000229891700010
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35196
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Zeng,R. C. Wang,B. L. Zhou. Mechanical sensitivity of macroporous poly(vinyl formal) hydrogels to water content[J]. Acta Polymerica Sinica,2005(3):363-367.
APA	Y. Zeng,R. C. Wang,&B. L. Zhou.(2005).Mechanical sensitivity of macroporous poly(vinyl formal) hydrogels to water content.Acta Polymerica Sinica(3),363-367.
MLA	Y. Zeng,et al."Mechanical sensitivity of macroporous poly(vinyl formal) hydrogels to water content".Acta Polymerica Sinica .3(2005):363-367.