Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/338127
Type: Artigo
Title: High stiffness polymer composite with tunable transparency
Author: Owuor, Peter Samora
Chaudhary, Varun
Woellner, Cristiano F.
Sharma, V.
Ramanujan, R. V.
Stender, Anthony S.
Soto, Matias
Ozden, Sehmus
Barrera, Enrique V.
Vajtai, Robert
Galvão, Douglas S.
Lou, Jun
Tiwary, Chandra Sekhar
Ajayan, Pulickel M.
Abstract: Biological materials are multifunctional performing more than one function in a perfect synergy. These materials are built from fairly simple and limited components at ambient conditions. Such judicious designs have proven elusive for synthetic materials. Here, we demonstrate a multifunctional phase change (pc) composite from simple building blocks, which exhibits high stiffness and optical transmittance control. We show an increase of more than one order of magnitude in stiffness when we embed paraffin wax spheres into an elastomer matrix, polydimethylsiloxane (PDMS) in a dynamic compression test. High stiffness is mainly influenced by presence of microcrystals within the wax. We further show fast temperature-controlled optical switching of the composite for an unlimited number of cycles without any noticeable mechanical degradation. Through experimental and finite element method, we show high energy absorption capability of pc-composite. Based on these properties, the pccomposite could be used as an effective coating on glasses for cars and windows. This simple approach to multi-functionality is exciting and could pave way for designs of other multifunctional materials at the macro-scale.
Subject: Polidimetilsiloxano
Rigidez (Geometria)
Silicones
Country: Reino Unido
Editor: Elsevier
Rights: fechado
Identifier DOI: 10.1016/j.mattod.2017.12.004
Address: https://www.sciencedirect.com/science/article/pii/S1369702117306867
Date Issue: 2018
Appears in Collections:IFGW - Artigos e Outros Documentos

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