Organic–inorganic nanocomposite bilayers with triple shape memory effect

Bae, C.Y.; Park, J. H.; Kim, E. Y.; Kang, Young Soo; Kim, B. K.

doi:10.1039/c1jm10722d

Cited by 83 publications

(70 citation statements)

References 25 publications

(41 reference statements)

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“…Recently, polyether based polyurethane/silica nanocomposites were prepared by using solegel process. These crosslinked hybrid nanocomposites were obtained by adding fumed silica directly [32] or dispersed in a solvent [33] into organoalkoxysilane end-capped prepolymer solutions. On the other hand, there is no report in the literature dealing with the use of silica sol "as synthesized and aged" in basic media for the preparation of polyether-based TPU/silica nanocomposites, specifically through solution blending of the copolymer and the silica sol.…”

Section: Introductionmentioning

confidence: 99%

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Malay

Oğuz

Kosak

et al. 2013

Polymer

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a b s t r a c tNanocomposites consisting of thermoplastic polyurethaneeurea (TPU) and silica nanoparticles of various size and filler loadings were prepared by solution blending and extensively characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), thermal analysis, tensile tests, and nanoindentation. TPU copolymer was based on a cycloaliphatic diisocyanate and poly(tetramethylene oxide) (PTMO-2000) soft segments and had urea hard segment content of 20% by weight. TPU/silica nanocomposites using silica particles of different size (29, 74 and 215 nm) and at different loadings (1, 5, 10, 20 and 40 wt. %) were prepared and characterized. Solution blending using isopropyl alcohol resulted in even distribution of silica nanoparticles in the polyurethaneeurea matrix. FTIR spectroscopy indicated strong interactions between silica particles and polyether segments. Incorporation of silica nanoparticles of smaller size led to higher modulus and tensile strength of the nanocomposites, and elastomeric properties were retained. Increased filler content of up to about 20 wt. % resulted in materials with higher elastic moduli and tensile strength while the glass transition temperature remained the same. The fracture toughness increased relative to neat TPU regardless of the silica particle size. Improvements in tensile properties of the nanocomposites, particularly at intermediate silica loading levels and smaller particle size, are attributed to the interactions between the surface of silica nanoparticles and ether linkages of the polyether segments of the copolymers.

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Section: Introductionmentioning

confidence: 99%

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Malay

Oğuz

Kosak

et al. 2013

Polymer

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“…Following these concepts, the triple-SME has been realized in a number of polymer systems [54,[110][111][112][113][114][115][116][117]. Although in theory, we can achieve an infinite number of intermediate shapes [109,118], the significance of the SME in each intermediate shape is reduced with the increase of the number of the intermediate shapes.…”

Section: Multiple-sme (Shape Memory Effect)mentioning

confidence: 99%

Mechanisms of the Shape Memory Effect in Polymeric Materials

et al. 2013

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Abstract:This review paper summarizes the recent research progress in the underlying mechanisms behind the shape memory effect (SME) and some newly discovered shape memory phenomena in polymeric materials. It is revealed that most polymeric materials, if not all, intrinsically have the thermo/chemo-responsive SME. It is demonstrated that a good understanding of the fundamentals behind various types of shape memory phenomena in polymeric materials is not only useful in design/synthesis of new polymeric shape memory materials (SMMs) with tailored performance, but also helpful in optimization of the existing ones, and thus remarkably widens the application field of polymeric SMMs.

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“…18,19 The llers modied by chemical hybridization can achieve multifunctional crosslinking with polymers, thereby enhancing the rubber elasticity and strain recovery. 20 Among the various chemical hybridization agents, silane coupling agents with general formula of R-(CH 2 ) n -Si-(OR 0 ) 3 are widely used to modify llers or polymers. 21 Several literature works have reported that the silane coupling agents generate bridging with the surface of llers, and greatly enhance the physical bonding between the llers and the polymer matrix.…”

Section: 10mentioning

confidence: 99%

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

Zhang

Ren

et al. 2017

RSC Adv.

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Recently, zwitterionic shape memory polyurethanes (ZSMPUs) have found many promising applications in smart biomedical field. This paper provides a novel strategy to improve shape memory properties of ZSMPUs by using a silane coupling agent, namely 3-glycidyloxypropyl-trimethoxysilane (KH560). The synergistic effects of zwitterionic segments and silane coupling agents on the structure, morphology, thermal properties, mechanical properties, and shape memory properties were carefully investigated.The results demonstrate that the incorporation of KH560 does not influence the original molecular structure and morphology of ZSMPUs, and the KH560-modified ZSMPUs form a hard-soft phase separation structure. Also, the KH560 modification promotes the entanglement of hard segments, and thus provides better mechanical properties to ZSMPUs-KH560. Moreover, the silane coupling agent can provide lubrication to influence the aggregation of soft segments while the zwitterionic segments promote the formation of crystal seeds. Therefore, a good semi-crystalline soft phase endows the ZSMPUs-KH560 with a decent shape fixity (e.g. above 94%), and the entangled hard segments greatly enhance the shape recovery of ZSMPUs (e.g. above 90%).

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Organic–inorganic nanocomposite bilayers with triple shape memory effect

Cited by 83 publications

References 25 publications

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Polyurethaneurea–silica nanocomposites: Preparation and investigation of the structure–property behavior

Mechanisms of the Shape Memory Effect in Polymeric Materials

Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

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