Thermally Controlled Shape-Memory Investigations of Nanocomposites Based on Oligo(ω-pentadecalactone) and Magnetic Nanoparticles Acting as Crosslinks. Issue 1718 (2015)

• Record Type: Journal Article
• Authors: Razzaq, M. Yasar; Behl, M.; Lendlein, A.
• Editors: Lendlein, A.; Tirelli, N.; Weiss, R.A.; Xie, T.
• Is Part Of: MRS proceedings. Issue 1718:(2014)
• Page Start: 71
• Page End: 76
• Publication Date: 2015
• Subjects: composite, -- magnetic, -- polymer; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.495
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: Covalent integration of inorganic nanoparticles into polymer matrices leads to a homogenization of their distribution and enhances the structural properties. Here, we report on a thermally-controlled reversible shape-memory effect (R-SME) of magnetic nanocomposites under stress-controlled conditions. The magnetic nanocomposites consisted of an oligo( ω -pentadecalactone) (OPDL) matrix with covalently integrated or physically added magnetic nanoparticles (MNP). The R-SME of these materials was based on crystallization-induced elongation (CIE) and melting-induced contraction (MIC) under a constant stress in thermomechanical experiments. Furthermore, the adjustability of the recovery stress in magnetic nanocomposites as a function of MNP content was investigated. A slight increase in the recovery stress from 0.9 MPa for pure OPDL network to 1.2 MPa for H-NC containing 9 wt% of covalently integrated MNP was observed.