Relaxation based modeling of tunable shape recovery kinetics observed under isothermal conditions for amorphous shape-memory polymers

Abstract Polymers, which allow the adjustment of shape-memory properties by variation of physical parameters during programming, are advantageous to their counterparts requiring synthesis of a new material. Here we explored the stress relaxation behaviour of polyurethane (PEU) based shape-memory polymers at temperatures from 0 °C to 80 °C and different strain values from 100% to 250%. The obtained relaxation curves could be well described by a modified Maxwell–Weichert model of two Maxwell units and a spring. The stress relaxation results in a combination of a slow and a fast decaying process. For modeling the isothermal recovery of recently introduced PEU composite scaffolds at 37 °C the fast relaxation could be neglected resulting in a model of a standard linear solid, which was in good agreement with the experimental data. The presented modeling approach might be helpful to define design criteria for self sufficiently moving scaffolds within a knowledge-based development process.

[1]  Yiping Liu,et al.  Finite strain 3D thermoviscoelastic constitutive model for shape memory polymers , 2006 .

[2]  Andreas Lendlein,et al.  Shape-memory polymer networks from oligo[(epsilon-hydroxycaproate)-co-glycolate]dimethacrylates and butyl acrylate with adjustable hydrolytic degradation rate. , 2007, Biomacromolecules.

[3]  Marc Behl,et al.  Actively moving polymers. , 2006, Soft matter.

[4]  Heng Zhang,et al.  A novel type of shape memory polymer blend and the shape memory mechanism , 2009 .

[5]  Seyed Hassan Jafari,et al.  Investigation and Modeling of Temperature Dependence Recovery Behavior of Shape‐Memory Crosslinked Polyethylene , 2007 .

[6]  Marc Behl,et al.  Shape-Memory Polymers and Shape-Changing Polymers , 2009 .

[7]  Xiubing Pang,et al.  Novel degradable compound shape-memory-polymer blend: Mechanical and shape-memory properties , 2010 .

[8]  G. Eggeler,et al.  Functional Fatigue of Shape Memory Polymers , 2008 .

[9]  Andreas Lendlein,et al.  Characterization Methods for Shape-Memory Polymers , 2009 .

[10]  Andreas Lendlein,et al.  Kinetics and dynamics of thermally-induced shape-memory behavior of crosslinked short-chain branched polyethylenes , 2009 .

[11]  I. J. Rao,et al.  Constitutive modeling of the mechanics associated with crystallizable shape memory polymers , 2006 .

[12]  Yiping Liu,et al.  Thermomechanics of shape memory polymers: Uniaxial experiments and constitutive modeling , 2006 .

[13]  Mao Xu,et al.  Polyurethanes having shape memory effects , 1996 .

[14]  P. Mather,et al.  Shape Memory Polymer Research , 2009 .

[15]  A. Lendlein,et al.  Mechanically active scaffolds from radio‐opaque shape‐memory polymer‐based composites , 2011 .

[16]  Hisaaki Tobushi,et al.  Thermomechanical Constitutive Modeling in Shape Memory Polymer of Polyurethane Series , 1997 .

[17]  H. Radusch,et al.  Multiple shape-memory behavior and thermal-mechanical properties of peroxide cross-linked blends of linear and short-chain branched polyethylenes , 2008 .

[18]  Shravanthi T. Reddy,et al.  Bioinspired Surfaces with Switchable Adhesion , 2007 .

[19]  Marc Behl,et al.  Shape-memory capability of binary multiblock copolymer blends with hard and switching domains provided by different components , 2009 .

[20]  Jin-Sing Lin,et al.  Study on shape‐memory behavior of polyether‐based polyurethanes. II. Influence of soft‐segment molecular weight , 1998 .

[21]  Wei Min Huang,et al.  Mechanisms of the multi-shape memory effect and temperature memory effect in shape memorypolymers , 2010 .

[22]  M. Maugey,et al.  Shape and Temperature Memory of Nanocomposites with Broadened Glass Transition , 2007, Science.

[23]  Andreas Lendlein,et al.  Degradable, Multifunctional Polymeric Biomaterials with Shape-Memory , 2005 .

[24]  Marc Behl,et al.  Triple-shape polymers , 2010 .

[25]  J. Dunlop,et al.  Two stages in three-dimensional in vitro growth of tissue generated by osteoblastlike cells , 2010, Biointerphases.

[26]  J. Cui,et al.  Adjusting shape-memory properties of amorphous polyether urethanes and radio-opaque composites thereof by variation of physical parameters during programming , 2010 .

[27]  I. M. Ward,et al.  A novel approach to predict the recovery time of shape memory polymers , 2010 .

[28]  Warren P. Mason,et al.  Introduction to polymer viscoelasticity , 1972 .

[29]  A. Lendlein,et al.  Initiation of shape-memory effect by inductive heating of magnetic nanoparticles in thermoplastic polymers. , 2006, Proceedings of the National Academy of Sciences of the United States of America.

[30]  T. Xie.  Tunable polymer multi-shape memory effect , 2010, Nature.

[31]  Andreas Lendlein,et al.  Shape-Memory Properties of Radiopaque Micro-Composites from Amorphous Polyether Urethanes Designed for Medical Application , 2009 .

[32]  A. Lendlein,et al.  Degradable shape-memory polymer networks from oligo[(l-lactide)-ran-glycolide]dimethacrylates. , 2007, Soft matter.

[33]  Kumbakonam R. Rajagopal,et al.  A thermodynamic framework for the modeling of crystallizable shape memory polymers , 2008 .

[34]  D. Ratna,et al.  Recent advances in shape memory polymers and composites: a review , 2008 .

[35]  A. Lendlein,et al.  Shape-memory polymers. , 2002, Angewandte Chemie.