Journal Article10.1021/ACS.JPCC.8B02824
Nanostructure-Controlled Shape Memory Effect in Polyurethanes
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TL;DR: Different hard segment content polyurethanes (PUs) have been synthesized using linear and alicyclic diisocyanates to understand the effect on structure-property relationship and how it affects the shape memory behavior of PUs as discussed by the authors.
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Abstract: Different hard segment content (HSC) polyurethanes (PUs) have been synthesized using linear (hexamethylene diisocyanate; HMDI) and alicyclic (isophorone diisocyanate; IPDI) diisocyanates to understand the effect on structure–property relationship and how it affects the shape memory behavior of PUs. Structural details have been elucidated through NMR and other spectroscopic techniques including the quantification of HSC. The nature of interactions between the polymer chains and their extent has been revealed. Thermal and mechanical properties as a function of the chemical structure and HSC indicate faster degradation in higher HSC. Layer-by-layer self-assembly through extensive hydrogen bonding has been established through XRD, small-angle neutron scattering, AFM, and optical images by capturing nanometer scale to micron scale inhomogeneities. The greater interaction in the HMDI system as compared to IPDI PUs leads to the crystallization of the hard segment. The differential shape memory effect has been re...
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Citations
Microstructural design for enhanced mechanical property and shape memory behavior of polyurethane nanocomposites: Role of carbon nanotube, montmorillonite, and their hybrid fillers
Mahbod Abrisham,Mahyar Panahi-Sarmad,Gity Mir Mohamad Sadeghi,Mohammad Arjmand,Parham Dehghan,Arian Amirkiai +5 more
TL;DR: In this paper, a series of fast heat-actuated shape memory polymer composite with greatly enhanced stretch-ability, mechanical stiffness, dynamic-modulus, rheological qualities, recovery and fixity ratio was prepared by incorporating multi-walled carbon nanotubes (CNT), montmorillonite (MMT) and CNT:MMT hybrid into thermoplastic polyurethane (TPU).
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Injectable hydrogels of newly designed brush biopolymers as sustained drug-delivery vehicle for melanoma treatment.
TL;DR: In this article, a brush copolymer injectable hydrogel is developed for cancer treatment using its controlled drug-release potential, which is shown to have significant cytotoxic effects on cancer cells.
Cashew nut shell liquid terminated self-healable polyurethane as an effective anticorrosive coating with biodegradable attribute
Tuhin Ghosh,Niranjan Karak +1 more
TL;DR: In this paper, different compositions containing polyurethane were synthesized using few bio-derived raw materials like cashew nut shell liquid, modified polyol of dimer acid-glycerol and sunflower oil based monoglyceride along with other components like bis(hydroxyalkyl)poly(dimethylsiloxane), poly(e-caprolactone)diol, 2,4/2,6-toluene diisocyanate and isophorone diisociate.
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A facile preparation strategy of polycaprolactone (PCL)-based biodegradable polyurethane elastomer with a highly efficient shape memory effect
Qing Luo,Jing Chen,Pitchaimari Gnanasekar,Xiaozhen Ma,Dong-Dong Qin,Haining Na,Jin Zhu,Ning Yan +7 more
TL;DR: These PUs had superior biodegradability in buffer solution without enzyme catalysis and the biodegradation weight loss ratio of the PCBU reached 48% within 3 months in the buffer solution.
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Polyurethane/Nitrogen-Doped Graphene Quantum Dot (N-GQD) nanocomposites: synthesis, characterization, thermal, mechanical and shape memory properties
Sanaz Sarabiyan Nejad,Mostafa Rezaei,Massoumeh Bagheri +2 more
- 03 Mar 2020
TL;DR: A series of polyurethane-based nanocomposites with different contents of N-GQD nanoparticles were prepared via solution casting and in-situ polymerization methods.
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