Hornat CC, Yang Y, Urban MW. Quantitative Predictions of Shape-Memory Effects in Polymers.
ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017;
29:1603334. [PMID:
27966797 DOI:
10.1002/adma.201603334]
[Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 08/29/2016] [Indexed: 05/23/2023]
Abstract
Unique shape-memory transitions manifested by directional extension and subsequent retraction in polymers are attributed to stored conformational entropy. This behavior is quantified in terms of stored (ΔS S ) entropic energy density, the maximum strain (εmax ), and stress (σSF at εmax ). This concept allows quantitative assessments of the shape-memory effect (SME) and can be utilized in any material that exhibits a glass-transition temperature (T g ) and a rubbery plateau.
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