Confined thin film wrinkling on shape memory polymer with hybrid surface morphologies  

作　　者：Yu Wang Jianliang Xiao 

机构地区：[1]Department of Mechanical Engineering,University of Colorado Boulder,Boulder,Colorado 80309,USA [2]Department of Nanomedicine,Houston Methodist Research Institute,Houston,Texas 77030,USA

出　　处：《Acta Mechanica Sinica》2021年第7期1063-1071,I0001,共10页力学学报（英文版）

基　　金：The financial supports from NSF(CMMI-1405355)and ACS Petroleum Research Fund(53780-DNI7)are gratefully acknowledged.

摘　　要：With appropriate stimuli,such as heat,humidity,or magnetic field,shape memory polymers(SMPs)can recover to their original shapes from temporary,programmed states.Using thermal responsive SMPs as substrates,we demonstrate a simple method to realize hybrid surface morphologies through confined thin film wrinkling in localized areas.The bilayer system was fabricated by depositing a layer of aluminum thin?lm on top of a SMP substrate programmed with a tensile strain.After the system was heated by a heating wire,hybrid wrinkling patterns were formed in a confined circular area around the heat source,with an inner spoke pattern and an outer ring pattern.Wrinkling patterns showed good symmetry,and the size of the wrinkling area can be tuned by controlling the heat input.This study o?ers a simple but effective approach to fabricate hybrid morphological features in micro-scale.With appropriate stimuli,such as heat,humidity,or magnetic field,shape memory polymers(SMPs)can recover to their original shapes from temporary,programmed states.Using thermal responsive SMPs as substrates,we demonstrate a simple method to realize hybrid surface morphologies through confined thin film wrinkling in localized areas.The bilayer system was fabricated by depositing a layer of aluminum thin?lm on top of a SMP substrate programmed with a tensile strain.After the system was heated by a heating wire,hybrid wrinkling patterns were formed in a confined circular area around the heat source,with an inner spoke pattern and an outer ring pattern.Wrinkling patterns showed good symmetry,and the size of the wrinkling area can be tuned by controlling the heat input.This study offers a simple but effective approach to fabricate hybrid morphological features in micro-scale.

关 键 词：Wrinklng Hybrid surface morphologies Shape memory polymers(SMPs) 

分 类 号：O34[理学—固体力学]