Control of Dielectric and Mechanical Properties of Styrenic Block Copolymer by Graphite Incorporation

Ciuprina, Florin; Panaitescu, Denis Mihaela; Enache, Laura; Damian, Celina Maria; Grigorescu, Ramona Marina; Gabor, Augusta Raluca; Nicolae, Cristian Andi; Nistor, Cristina Lavinia; Trușcă, Roxana

doi:10.3390/ma15217577

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…There was a slight reduction in this melting temperature ( T m ) for mS/NC and mS/a x NC compared to mS, indicating a less compact structure due to the presence of NC fibrils. These fibrils likely hinder the order of the EB midblocks . In all the mS/a x NC composites, an additional domain with a T m ranging from 63 °C to 67 °C is evident.…”

Section: Resultsmentioning

confidence: 95%

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Thermoresponsive Shape Memory Behavior of an Acylated Nanofibrillar Cellulose-Reinforced Thermoplastic Elastomer Composite

Maji,

Neethirajan,

Chaitanya Sunka

et al. 2024

ACS Appl. Polym. Mater.

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Thermoresponsive shape memory polymers (SMPs) are a promising research area with significant potential in smart grippers, wearable electronics, and biomedical devices. The present study introduces a thermoresponsive SMP consisting of a maleic anhydride grafted polystyrene-block-polyethylenebutylene-block-polystyrene-triblock copolymer (MA-g-SEBS) and plant-derived nanofibrillar cellulose (NC). In contrast to most of the studies that utilize hydrophilic nanoscaled cellulose, this study employs surface acylated nanofibrillar cellulose (a x NC). The acylation process facilitates enhanced interaction between a x NCs and the polymer matrix, improving tensile strength, elongation at break, and storage modulus for dynamic applications. Furthermore, it aids in aligning the copolymer chains parallel to the cellulose fibrils. The orientated composite exhibits a high shape recovery percentage of approximately 92% when subjected to torsional strain owing to stored elastic energy. The acyl groups grafted onto the NC surface have the ability to create an additional domain within the MA-g-SEBS matrix, resulting in an excellent shape fixity (∼94%). Additionally, the cytocompatibility and cell adhesion studies indicated favorable biocompatibility of the composite. This work presents an efficient, eco-friendly approach for developing a sustainable cellulose-based multifunctional shape memory composite suitable for biomedical applications.

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Section: Resultsmentioning

confidence: 95%

“…These fibrils likely hinder the order of the EB midblocks. 56 In all the mS/a x NC composites, an additional domain with a T m ranging from 63 °C to 67 °C is evident. The formation of transient zones is mainly due to the crystallization of the acyl chains within the EB block.…”

Section: Determination Of Degree Of Substitution (Ds)mentioning

confidence: 89%

Thermoresponsive Shape Memory Behavior of an Acylated Nanofibrillar Cellulose-Reinforced Thermoplastic Elastomer Composite

Maji,

Neethirajan,

Chaitanya Sunka

et al. 2024

ACS Appl. Polym. Mater.

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show abstract

“…Meanwhile, the peak temperature ( T max 1 ) was shifted to a higher temperature by 24 °C for PP/15SBS. This large improvement in the thermal stability of the blends is due to the thermal behavior of SEBS and SBS, which lose less than 5% of their weight at up to 400 °C [ 48 , 49 ]. The addition of HF inserts a new peak ( T max 2 ) in the TG curves of the composites at around 318 °C.…”

Section: Resultsmentioning

confidence: 99%

Complex Effects of Hemp Fibers and Impact Modifiers in Multiphase Polypropylene Systems

et al. 2023

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Natural fibers-reinforced polymer composites have progressed rapidly due to their undeniable advantages. Most of the commercial polypropylene (PP)-based materials are characterized by either high impact toughness or high stiffness, while the manufacture of PP composites with both good toughness and stiffness is challenging at present. In this work, poly[styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS) and poly(styrene-b-butadiene-b-styrene) (SBS) copolymers were used in different amounts as modifiers in PP/hemp fibers (HF) composites, with the aim to use them for electrical vehicle parts. The interface in these multiphase systems was controlled by the addition of maleated polypropylene (MAPP). SEBS and SBS showed different effects on the elongation at break of the blends and the corresponding composites due to the HF that stiffened the multiphase systems. Similarly, a different action of MAPP was observed in the composites containing SEBS or SBS: higher Young’s and storage moduli were obtained for the composite containing SBS, while greater elongation at break and impact strength values were recorded for the SEBS-containing system. In addition, a remarkable dispersion in the MAPP-containing composite and two times smaller average particle size were revealed by the SEM analysis for the SEBS particles compared to the SBS ones. The higher affinity of SEBS for PP compared to that for SBS and the different morphological characteristics of the systems containing SEBS and SBS may explain the different effects of these impact modifiers on the mechanical properties of the composites. The composites developed in this work were designed as substitutes for the fully synthetic polymeric materials or metal components used in the manufacturing of automotive parts.

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Sensor‐Embedded Muscle for Closed‐Loop Controllable Actuation in Proprioceptive Biohybrid Robots

Filippi,

Balciunaite,

Georgopoulou

et al. 2024

Advanced Intelligent Systems

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Biohybrid robots are soft robots that exploit unique characteristics of biological cells and tissues for motion generation. Skeletal muscle tissue‐based bioactuators respond to externally applied stimuli, such as electrical fields. However, current bioactuation systems rely on open‐loop control strategies that lack knowledge of the actuator's state. The regulation of output force and position of biohybrid robots requires self‐sensing control systems that combine bioactuators with sensors and control paradigms. Herein, a soft, fiber‐shaped mechanical sensor based on a piezoresistive composite is proposed that efficiently integrates with engineered skeletal muscle tissue and senses its contracting states in a cell culture environment in the presence of applied electrical fields. After testing the sensor's insulation and biocompatibility, its sensitivity for typical strains (<1%) is characterized, and its ability is proven to detect motions from contractile skeletal muscle tissue constructs. Finally, it is shown that the sensor response can feed an autonomous control system, thus demonstrating the first proprioceptive biohybrid robot that senses and responds to its contraction state. In addition to inspiring implantable systems, biomedical models, and other bioelectronic devices, the proposed technology will confer biohybrids with decisional autonomy, thus driving the paradigm shift between bioactuators and intelligent biohybrid robots.

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Control of Dielectric and Mechanical Properties of Styrenic Block Copolymer by Graphite Incorporation

Cited by 5 publications

References 40 publications

Thermoresponsive Shape Memory Behavior of an Acylated Nanofibrillar Cellulose-Reinforced Thermoplastic Elastomer Composite

Thermoresponsive Shape Memory Behavior of an Acylated Nanofibrillar Cellulose-Reinforced Thermoplastic Elastomer Composite

Complex Effects of Hemp Fibers and Impact Modifiers in Multiphase Polypropylene Systems

Sensor‐Embedded Muscle for Closed‐Loop Controllable Actuation in Proprioceptive Biohybrid Robots

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