Evaluation of interfacial region of microphase-separated SEBS using modulated differential scanning calorimetry and dynamic mechanical thermal analysis

Karode, Nireeksha; Poudel, Anup; Fitzhenry, Laurence; Matthews, Siobhán; Walsh, Philip R.; Coffey, Austin

doi:10.1016/j.polymertesting.2017.07.006

Cited by 25 publications

(20 citation statements)

References 35 publications

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“…In order to assess a correlation between polymer crystallization and molecular moment phenomena in pristine PVDF-TrFE (as-received), solvent-cast PVDF-TrFE films annealed at 120°C and solvent-cast PVDF-TrFE/BNNT 1 wt.% nanocomposites annealed at 120°C, modulated differential scanning calorimetry (MDSC) was performed to resolve overlapping kinetic events into reversing and non-reversing DSC curves. This technique has been recently used to characterize complex block polymers, but has not been fully utilized to characterize the molecular movement and crystallization behavior of PVDF-TrFE (Knopp et al, 2016; Karode et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

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Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

et al. 2019

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Analysis of the cellular response to piezoelectric materials has been driven by the discovery that many tissue components exhibit piezoelectric behavior ex vivo . In particular, polyvinylidene fluoride and the trifluoroethylene co-polymer (PVDF-TrFE) have been identified as promising piezo and ferroelectric materials with applications in energy harvesting and biosensor devices. Critically, the modulation of the structural and crystalline properties of PVDF-TrFE through annealing processes and the addition of particulate or fibrous fillers has been shown to modulate significantly the materials electromechanical properties. In this study, a PVDF-TrFE/boron-nitride nanotube composite was evaluated by modulated differential scanning calorimetry to assess the effects of boron nitride nanotube addition and thermal annealing on the composite structure and crystal behavior. An increased beta crystal formation [f(β) = 0.71] was observed following PVDF-TrFE annealing at the first crystallization temperature of 120°C. In addition, the inclusion of boron nitride nanotubes significantly increased the crystal formation behavior [f(β) = 0.76] and the mechanical properties of the material. Finally, it was observed that BNNT incorporation enhance the adherence and proliferation of human tenocyte cells in vitro .

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Section: Resultsmentioning

confidence: 99%

“…Samples were kept under isothermal conditions for 3 min followed by heating at 3°C/min. A similar method was previously implemented for microphase and molecular movement studies using a different copolymer (Karode et al, 2017; Poudel et al, 2017).…”

Section: Methodsmentioning

confidence: 99%

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

et al. 2019

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“…It was found however that direct use of CB with ABS resulted in a very brittle material, particularly at higher concentrations of CB [11], [12]. SEBS is a polymer composed of a tri-block structure, with two end hard blocks and an elastomeric rubbery mid-block [9]. The composite of ABS and SEBS was found to offer good toughness, material strength but also flexibility and malleability including upon addition of CB.…”

Section: Methodsmentioning

confidence: 99%

“…This study introduces solid TMMs based on a composite of acrylonitrile butadiene (ABS) and poly(styrene-b-ethylenebutylene-b-styrene) (SEBS). The composite produced is both 3D printable and offers an augmentation in elasticity and toughness compared to a pure ABS base polymer [7]- [9]. The addition of a highly electrically conductive form of Carbon Black (CB) [10] as a filler in the composite enables the dielectric properties of the TMMs to lay within the range of properties of biological tissues, as measured in the 0.5 -8.5 GHz microwave band.…”

Section: Introductionmentioning

confidence: 99%

3D Printable Solid Tissue-Mimicking Material for Microwave Phantoms

McDermott

Porter

OrHalloran

et al. 2018

2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med)

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Phantoms provide valuable platforms for testing of medical devices including microwave diagnostic systems. This work describes a 3D printable solid tissue-mimicking material (TMM) for the production of such phantoms. The TMM is fabricated from ABS, SEBS and Carbon Black. The polymers ABS and SEBS produce a material that is 3D printable, robust and mechanically stable. Adjustment of the percentage of Carbon Black in a mixture alters the dielectric properties of the mixture. A variety of such mixtures were fabricated into 3D printable spools and the dielectric properties were measured across the 0.5-8.5 GHz band. The dielectric properties of a wide biological range are covered with the ability to emulate tissues within the range. The material hence can be used to print anatomically realistic and dielectrically accurate phantoms that can be multilayered and as complex as desired depending on the study.

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“…Styrenic block copolymer polystyrene‐b‐(ethylene‐co‐butylene)‐b‐styrene (SEBS), a traditional triblock styrenic copolymers, is a widely used thermoplastic elastomer . Thanks to its chemical composition and microphase‐separated structure, SEBS shows excellent processability and can be employed widely as coatings, adhesives, and impact modifiers for engineering plastics . However, SEBS possesses relatively high flammability, and the filling oil utilized to improve its processability induces serious dripping during combustion.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of organophosphate functionalized montmorillonite on properties and water resistance of intumescent flame‐retarded SEBS

Qian

et al. 2018

Fire and Materials

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Summary Polystyrene‐b‐(ethylene‐co‐butylene)‐b‐styrene (SEBS) is a widely used thermoplastic elastomer. However, it suffers from poor flame retardancy. Proper combination of organic‐modified montmorillonite and intumescent flame retardant (IFR) works but is not stable due to easy absorption of moisture. In this study, a novel and stable halogen‐free flame‐retardant system is demonstrated by encapsulating a hydrophobic organophosphate, ie, bisphenol A bis (diphenyl phosphate) (BDP) into a stable micelle and then “attaching” the BDP micelles to the montmorillonite (called: side‐intercalation). The resulted BDP modified montmorillonite (BMMT) has a large inter‐platelet spacing and demonstrated synergistic effect with IFR on flame retardancy, tensile property, and water resistance for the composite with SEBS. In addition to more homogeneous dispersion of IFR and BMMT, a longer‐lasting interfacial interaction between IFR and SEBS matrix with addition of small amount of BMMT also plays the role. The results suggest that BMMT can serve as an effective additive for formulating novel halogen‐free flame retardants for the SEBS to meet increasingly stricter environmental requirements.

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Evaluation of interfacial region of microphase-separated SEBS using modulated differential scanning calorimetry and dynamic mechanical thermal analysis

Cited by 25 publications

References 35 publications

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

Boron Nitride Nanotube Addition Enhances the Crystallinity and Cytocompatibility of PVDF-TrFE

3D Printable Solid Tissue-Mimicking Material for Microwave Phantoms

Synergistic effect of organophosphate functionalized montmorillonite on properties and water resistance of intumescent flame‐retarded SEBS

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