Fabricating super tough polylactic acid based composites by interfacial compatibilization of imidazolium polyurethane modified carbon nanotubes

Wang, Zhenfeng; Tu, Jiaying; Gao, Yuanwen; Xu, Pei; Ding, Yunsheng

doi:10.1016/j.ijbiomac.2023.125079

Cited by 8 publications

(2 citation statements)

References 56 publications

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“…As shown in Figure b, the storage modulus of the blends has the same trend as that of pure PC, but a decrease in the low-frequency region. Furthermore, No nonterminal behavior is observed in the G′– ω curves of all blends in the low-frequency region, which is different from the rheological behavior of most blends with high rubber content. − In this work, the low-content Sr phase did not self-cross-link or cocross-link with PC to form a network structure during the process of melt blending, promising the enhanced processability of the blend. In the whole test frequency range, the elasticity of the blends is lower than that of pure PC, which is beneficial to the processing and molding of the products.…”

Section: Resultsmentioning

confidence: 65%

Compatibilization of Polycarbonate/Silicon Rubber Blend with Styrene/Silicon Oil/Acrylonitrile Ternary Copolymer for Ultra-High Low-Temperature Toughness

Yang,

Zhang,

Zhu

et al. 2024

ACS Appl. Polym. Mater.

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The higher notch sensitivity of polycarbonate (PC) at low temperatures limits its application in some fields. In this work, a ternary copolymer P(St-SiO-An) composed of styrene (St), silicon oil (SiO), and acrylonitrile (An) was synthesized via a conventional radical copolymerization. Then, the compatibilities between PC/silicon rubber (Sr), PC/P(St-SiO-An), and P(St-SiO-An)/Sr were predicted through molecular dynamics simulation. By using P(St-SiO-An) as the effective compatibilizer, a series of PC/ Sr blends were prepared via the melt blending method. The mechanical, morphological, thermal, and rheological changes of the blends were investigated in detail. The molecular dynamics simulation showed that the compatibilities of PC/P(St-SiO-An) and P(St-SiO-An)/Sr pairs were significantly higher than those of the PC/Sr pair. P(St-SiO-An) ternary copolymer with a distinct chemical composition was synthesized successfully according to the results of Fourier transform infrared, 1H nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis methods. Under the optimal composition of PC/Sr = 95/5 with 4 phr of P(St-SiO-An), a transition from brittle to superductile fracture was observed on the notched impact cross-section of the blend at −40 °C, and the notch impact strength reached 116.2 kJ/m 2 , which was more than 7 times that of 16.5 kJ/m 2 for pure PC with a 94.1% yield strength retention ratio at room temperature. Cavitation-matrix-forced high elastic deformation was the main toughening mechanism at low temperatures. Furthermore, the introduction of Sr and compatibilizer hardly affected the thermal performance of the PC, and the thermal stability and processability were enhanced. Compared with the SABIC EXL series commercial PC, the blend in this work shows great advantages in preparation methods and comprehensive properties, which are expected to further broaden the application of PC in the field of low-temperature resistance.

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Section: Resultsmentioning

confidence: 65%

Compatibilization of Polycarbonate/Silicon Rubber Blend with Styrene/Silicon Oil/Acrylonitrile Ternary Copolymer for Ultra-High Low-Temperature Toughness

Yang,

Zhang,

Zhu

et al. 2024

ACS Appl. Polym. Mater.

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“…This is because MWCNTs can interact with solid dispersed materials, 12 and soft polymers (imidazole and polyurethane). 13 It is also important to mention that the properties of MWCNTs can be modified by functionalization, 14 and encapsulation of metal particles in Refs. 15,16 Jiang et al 17 described the effect of MWCNTs; encapsulated in cobalt particles; on the absorption properties of electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

Facile microwave synthesis of multi‐walled carbon nanotubes for modification of elastomer used as heaters

Ali,

Shchegolkov,

Shchegolkov

et al. 2023

Polymer Engineering & Sci

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Multi‐walled carbon nanotubes (MWCNTs) were synthesized by a microwave method. MWCNTs had filamentous shapes (10 μm) and were intertwined in bundles (40–60 nm diameter). The rapid oxidation of MWCNTs with a loss of 90% of weight was observed from 530 to 630°C. 2% Residue was present at 630°C, which gradually decreased to 1.2% at 1000°C. In a silicone elastomer, increased thermal conductivity at a concentration of 8% MWCNTs was observed. The highest thermal conductivity of the nano‐modified elastomer was 0.48 W/m°C with 8.0 wt% MWCNTs. The highest electrical conductivity was 2.4 × 10−5 S cm−1 at 8.0 wt% MWCNTs. Both the thermal and electrical conductivities showed percolation behavior with the percolation thresholds at 6 and 5 wt%, respectively. The MWCNTs synthesized by microwave method gave a good power economy in comparison to MWCNTs obtained by chemical vapor deposition (CVD) on NiMg catalyst. Microwave‐synthesized MWCNTs showed high stability at a potential of 250 V in an electrical resistance heater application due to the presence of Fe on the surface of MWCNTs. The developed heater can effectively operate at 220 V, which enables the use of the tubes in household appliances, such as heat fans, irons, and washing machines.Highlights Synthesis of MWCNTs by microwave plasma treatment of ferrocene and graphite. Characterization of MWCNTs by different techniques. Concentration dependence of electro‐ and thermal conductivity of MWCNTs in elastomers. Electro‐physical parameters studies of elastomers modified with MWCNTs. Heat generation studies in elastomeric matrix with MWCNTs.

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Enhancing mechanical and shape memory properties of polylactide/polyamide elastomer blends via reactive blending with a chain extender

Long,

Li,

et al. 2024

J of Applied Polymer Sci

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The structure and properties of incompatible polylactide (PLA)/polyamide elastomer (PAE) blends were tailored by a chain extender specifically the styrene–glycidyl acrylate copolymer Joncryl ADR4368 (ADR). Various PLA/PAE/ADR blends with different compositions were prepared by melt blending, and their morphology, crystallization behavior, and mechanical and the shape memory properties were systematically investigated. The results showed a uniform dispersion of PAE particles in the PLA matrix for the PLA blends with a reduction in particle size upon the addition of ADR. The crystallization of PLA was retarded, which was confirmed by a decrease in the melt crystallization temperature and an increase in cold crystallization temperature in the PLA/PAE/ADR blends. Rheological analysis showed an improvement in the melt elasticity of the PLA/PAE binary blend due to the presence of ADR, possibly attributed to the formation of long‐chain‐branched copolymers at the interface. Notably, the PLA/PAE/ADR blend exhibited superior toughness, featuring an elongation at break of 288% and a notched impact strength of 37 kJ·m−2, along with a high shape memory fixation rate and recovery rate when the ADR content was 1 wt%. Furthermore, the underlying toughening mechanism was elucidated. This work may offer an industrially scalable relevant model to fabricate high‐performance PLA materials.

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Fabricating super tough polylactic acid based composites by interfacial compatibilization of imidazolium polyurethane modified carbon nanotubes

Cited by 8 publications

References 56 publications

Compatibilization of Polycarbonate/Silicon Rubber Blend with Styrene/Silicon Oil/Acrylonitrile Ternary Copolymer for Ultra-High Low-Temperature Toughness

Compatibilization of Polycarbonate/Silicon Rubber Blend with Styrene/Silicon Oil/Acrylonitrile Ternary Copolymer for Ultra-High Low-Temperature Toughness

Facile microwave synthesis of multi‐walled carbon nanotubes for modification of elastomer used as heaters

Enhancing mechanical and shape memory properties of polylactide/polyamide elastomer blends via reactive blending with a chain extender

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