Triple-shape memory effects of modified semicrystalline ethylene–propylene–diene rubber/poly(ε-caprolactone) blends

Kashif, Muhammad; Chang, Young‐Wook

doi:10.1016/j.eurpolymj.2015.07.026

Cited by 40 publications

(20 citation statements)

References 37 publications

(59 reference statements)

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“…The blending strategy is a facile, cost‐effective, and straightforward method for large‐scale manufacturing. Therefore, a series of triple‐SMPs are recently developed through the conventional blending of two immiscible SM polymers exhibiting two distinct transition temperatures . However, fabrication of triple‐SMPs from completely miscible polymer pairs using the conventional blending approach is a challenging problem.…”

Section: Introductionmentioning

confidence: 99%

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Sabzi

Ranjbar‐Mohammadi

Zhang

et al. 2019

J of Applied Polymer Sci

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Recently, multiple‐shape memory polymers (SMPs) have attracted a great deal of attention in biomedical applications. Therefore, a series of triple‐SMPs were developed by simply blending of two immiscible SMPs exhibiting two distinct transition temperatures, which is required for triple‐shape memory (SM) effect. However, fabrication of triple‐SMPs from completely miscible polymer pairs using the conventional blending approach is a challenging problem. Because this type of blends consists of one homogeneous phase and thereby exhibit only one transition temperature and dual‐SM behavior. To overcome this problem, herein, a novel and versatile strategy is introduced for preparation of phase separated blends from a completely miscible polymer pair, exhibiting triple‐SM behavior. Dual‐electrospinning technique was utilized to simultaneously electrospin poly(lactic acid) (PLA) and poly(vinyl acetate) (PVAc), as a model miscible polymer pair, to obtain an interwoven polymer composite with two well‐separated thermal transitions, as revealed by dynamic mechanical analyze. Consequently, the SM experiments revealed that the electrospun PLA/PVAc composites have triple‐SM behavior. Furthermore, incorporation of graphene nanoplatelets into the composite fibers significantly improved the triple‐SM properties of samples. Additionally, excellent adherence and spreading of the osteoblasts on the fibrous scaffolds containing graphene were observed. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47471.

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Section: Introductionmentioning

confidence: 99%

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Sabzi

Ranjbar‐Mohammadi

Zhang

et al. 2019

J of Applied Polymer Sci

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“…The addition of PMMA microbeads in the TPU‐CNT nanocomposites resulted in the decrease in Δ H m and χ c . It is also important to note that Δ H m and χ c also decreased with increasing size of PMMA microbeads; this reduction of Δ H m and χ c in case of nanocomposites with respect to the neat polymers is generally observed when there are specific interactions between the polymer components in the nanocomposites . It was also noticed that T m decreased slightly with the addition of PMMA microbeads.…”

Section: Resultsmentioning

confidence: 77%

Carbon nanotube‐based thermoplastic polyurethane‐poly(methyl methacrylate) nanocomposites for pressure sensing applications

Imran

Shao

Haider

et al. 2016

Polymer Engineering & Sci

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We have synthesized unique flexible pressure‐sensitive nanocomposites by means of a solution mixing method, by adding multiwalled carbon nanotubes (MWCNTs) into a thermoplastic urethane (TPU) matrix along with poly(methyl methacrylate) (PMMA) microbeads of various sizes. The influence of the various PMMA bead sizes on the pressure sensing properties of the nanocomposites was studied over a range of pressures. The PMMA microbeads were used to achieve an early percolation threshold at low loadings of MWCNTs. We used scanning electron microscopy to study the nanocomposites' morphology, and conducted differential scanning calorimetry analyses to investigate their thermal properties. The nanocomposites' electrical and thermal conductivities were also measured under various applied pressures. The nanocomposites displayed repeatable electrical responses under various applied pressures, demonstrating their suitability for use as pressure sensing materials. The proposed material is an ideal candidate for use in the preparation of pressure‐sensitive devices. POLYM. ENG. SCI. 56:1031–1036, 2016. © 2016 Society of Plastics Engineers

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“…More recently, our group reported the T‐SME in a blend of PCL with ATA‐crosslinked semicrystalline ethylene‐propylene‐diene rubber (A‐EPDM). The two well‐separated crystalline melting transitions, combined with the supramolecular hydrogen bonding in the A‐EPDM as well as the intermolecular interactions between A‐EPDM and PCL, provide sufficient physical crosslinking to enable the T‐SME in these blends . In these blends, we observed that the elongation at break of the blend A‐EPDM/PCL containing 50 wt% PCL was drastically reduced to 224% during tensile testing experiments.…”

Section: Introductionmentioning

confidence: 85%

“…The deformed sample was then heated to T high to determine the shape recovery ratio ( R ). F and R were calculated using Eqns (S1) and (S2), respectively (Supporting Information) …”

Section: Methodsmentioning

confidence: 99%

Supramolecular semicrystalline polyolefin elastomer blends with triple‐shape memory effects

Kashif

Chang

2016

Polymer International

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Supramolecular polyolefin elastomer blends possessing triple-shape memory effects were prepared by melt blending of two semicrystalline maleated elastomers (maleated ethylene-propylene-diene rubber (mEPDM) and maleated polyethylene-octene elastomer (mPOE)) in the presence of a small amount of 3-amino-1,2,4-triazole (ATA). The amino group of ATA reacted with the maleic anhydride groups of both elastomers during melt blending to form supramolecular hydrogen-bonded networks. Dynamic mechanical analysis of the blends showed drops in the storage modulus at two different transition temperatures (T trans ) belonging to the crystalline melting temperatures of each phase as well as a plateau above these two T trans . This is an essential property for triple-shape memory behavior. Dual-shape memory properties of the blends were determined using one-step programming under three different temperature ranges. When an individual crystalline phase is used for the fixing process, the switching temperature (T sw ) relates to the melting temperature of a particular phase during the recovery process. However, if both crystalline phases are used simultaneously for the fixing process, then the T sw relates to the higher melting temperature. Cyclic two-step programming revealed that two different shapes can be fixed, one by EPDM crystallization and the other by POE crystallization, and both programmed shapes can be recovered upon heating above a specific T sw .

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Triple-shape memory effects of modified semicrystalline ethylene–propylene–diene rubber/poly(ε-caprolactone) blends

Cited by 40 publications

References 37 publications

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Designing triple‐shape memory polymers from a miscible polymer pair through dual‐electrospinning technique

Carbon nanotube‐based thermoplastic polyurethane‐poly(methyl methacrylate) nanocomposites for pressure sensing applications

Supramolecular semicrystalline polyolefin elastomer blends with triple‐shape memory effects

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