Preparation and characterization of thermo-responsive shape memory ester-based polymer blends

Tekay, Emre; Şen, Sinan; Korkmaz, Mahmut; Nugay, Nihan

doi:10.1007/s10853-023-08549-6

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…The information about creep resistance of the material is provided with creep strain and recovery versus time curves. 32–34 Short-term isothermal creep behaviors of PS, PS20SIBS blend, and its nanocomposites as well as PS-5CNT as representative binary composite were investigated. The creep test results are presented in Table 5.…”

Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, electrical properties of poystyrene/poly (styrene-b-isobutylene-b-styrene/carbon nanotube nanocomposites

Şen,

Cengiz,

Tekay

2024

Journal of Elastomers & Plastics

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In this study, high impact polystyrene (HIPS) materials was prepared by using a styrenic elastomer (10, 20, 30 wt%) and carbon nanotube (CNT) (3, 5, 7, 10 phr) by melt blending technique as alternative to commercial HIPS including polybutadiene rubber. The poly (styrene- b-isobutylene- b-styrene) (SIBS) was used as thermoplastic elastomer with polystyrene (PS) to improve its poor impact resistance and CNT was added to PS/SIBS blend matrix to maintain its strength and stiffness. The modulus, tensile strength and toughness values of the blends decreased while those of impact resistance increased in comparison to neat PS. The impact strength of PS20SIBS blend containing 20 wt% SIBS was found to be approximately 530% higher than pure PS. The nanocomposites of the PS20SIBS exhibited a decrease in the size of SIBS particles with increasing CNT compared to PS20SIBS. This was ascribed to the increased viscosity of PS matrix via CNT filler, preventing the coalescence of the elastomer domains. Compared to the PS20SIS, its nanocomposites showed higher strength, modulus and toughness, but lower impact strength. The toughness of the nanocomposite containing 5 phr CNT (PS20SIBS-5CNT), increased by 117% while its creep deformation decreased by approximately 40%, in comparison with PS20SIBS blend. Although PS20SIBS-5CNT exhibited lower impact strength than the PS20SIBS blend due to the dispersion of smaller SIBS particles in the PS matrix, it still increased the impact strength of pure PS by 188%. The PS20SIBS-5CNT nanocomposite, which improved impact strength and creep resistance with optimal toughness and tensile modulus can be used as a novel HIPS material that tunes the hardness-toughness/impact balance effectively. Moreover, the same nanocomposite was found to reach the conductivity threshold by exhibiting 106 times lower electrical resistance in comparison with that containing 3 phr CNT, leading to a conductive filer network with 5 phr loading of the nanotubes into the system.

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Section: Resultsmentioning

confidence: 99%

Thermal, mechanical, electrical properties of poystyrene/poly (styrene-b-isobutylene-b-styrene/carbon nanotube nanocomposites

Şen,

Cengiz,

Tekay

2024

Journal of Elastomers & Plastics

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“…The shape memory and self-healing effects of any polymeric blend can be influenced by their phase morphological structure, which refers to the arrangement and distribution of the different polymeric phases within the blend. For a typical polymeric blend phase morphology can affect the shape memory effect as well as self-healing via phase distribution, interfacial interactions, phase transition temperature, phase compatibility, and phase continuity. ,− The TEM images of the 50/50TPU-ENR blends show a kind of cocontinuous morphology (Figure a) which could originate the inherent shape memory effect. Second, on considering in terms of phase compatibility, the interaction between the TPU-ENR phases can also affect the shape memory effect.…”

Section: Resultsmentioning

confidence: 99%

Shape Memory Behavior and Self-Healing Effects of Dynamically Vulcanized TPU/ENR Thermoplastic Elastomeric Blends

Banerjee

2023

ACS Appl. Polym. Mater.

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In this work, an innovative TPE material architecture with excellent shape memory and self-healing properties has been fabricated by introducing an in situ polymerized zinc dimethacrylate (PZDMA) onto the macromolecular chains of thermoplastic polyurethane (TPU) and epoxidized natural rubber (ENR) via dynamic vulcanization. Damage to the developed material surface could be healed by physical contact between the cut surfaces through a contraction force (i.e., shape memory effect), reassociation of ionic networks, and molecular diffusion of ENR chains at the interface. Interestingly, PZDMA not only promotes the shape memoryassisted self-healing functionality by enhancing ionic interactions with the blend components but also improves mechanical properties by the formation of ionic clusters which act as a reinforcement. The formation of such ionic reversible networks and clusters was evident from temperature dependent Fourier transform infrared spectroscopy, X-ray diffraction, Small angle X-ray scattering, X-ray photon spectroscopy, and transmission electron microscopy studies. The resulting material exhibited excellent shape-fixation ratio (R f ∼ 95%), shape-recovery ratio (R r ∼ 98%), healing efficiency (∼80% based on tensile strength of pristine sample and healed sample) and oil swelling resistance (5−6% in ASTM oil #3) at a suitable transition temperature of 80 °C. This work provides a promising route for the fabrication of next generation TPE materials, which may also be developed into innovative programmable elastomeric materials.

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Development of binary and ternary polyester shape memory blends for additive manufacturing

Carrillo,

Gonzalez,

Parga

et al. 2024

J Mater Sci

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Preparation and characterization of thermo-responsive shape memory ester-based polymer blends

Cited by 8 publications

References 35 publications

Thermal, mechanical, electrical properties of poystyrene/poly (styrene-b-isobutylene-b-styrene/carbon nanotube nanocomposites

Thermal, mechanical, electrical properties of poystyrene/poly (styrene-b-isobutylene-b-styrene/carbon nanotube nanocomposites

Shape Memory Behavior and Self-Healing Effects of Dynamically Vulcanized TPU/ENR Thermoplastic Elastomeric Blends

Development of binary and ternary polyester shape memory blends for additive manufacturing

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