Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Mihara, Sho; Takeoka, Shinji

doi:10.1002/pat.5591

Cited by 7 publications

(7 citation statements)

References 27 publications

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“…The inorganic properties of Si materials effectively improve their heat resistance and flame retardancy [ 5 ], while their high Si–O–Si bond energy and low surface energy endow them with outstanding wear and weathering resistance [ 6 ]. In addition, polysiloxanes exhibit good hydrophobicity [ 7 , 8 ], high flexibility [ 9 ], and biocompatibility [ 10 ]. However, their low mechanical strength limits their applications in various fields [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Polysiloxane-Based Polyurethanes with High Strength and Recyclability

Wang

Bai

Sun

et al. 2022

IJMS

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Polysiloxanes have attracted considerable attention in biomedical engineering, owing to their inherent properties, including good flexibility and biocompatibility. However, their low mechanical strength limits their application scope. In this study, we synthesized a polysiloxane-based polyurethane by chemical copolymerization. A series of thermoplastic polysiloxane-polyurethanes (Si-TPUs) was synthesized using hydroxyl-terminated polydimethylsiloxane containing two carbamate groups at the tail of the polymer chains 4,4′-dicyclohexylmethane diisocyanate (HMDI) and 1,4-butanediol as raw materials. The effects of the hard-segment content and soft-segment number average molecular weight on the properties of the resulting TPUs were investigated. The prepared HMDI-based Si-TPUs exhibited good microphase separation, excellent mechanical properties, and acceptable repeatable processability. The tensile strength of SiTPU-2K-39 reached 21.5 MPa, which is significantly higher than that of other flexible polysiloxane materials. Moreover, the tensile strength and breaking elongation of SiTPU-2K-39 were maintained at 80.9% and 94.6%, respectively, after three cycles of regeneration. The Si-TPUs prepared in this work may potentially be used in gas separation, medical materials, antifouling coatings, and other applications.

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Section: Introductionmentioning

confidence: 99%

Polysiloxane-Based Polyurethanes with High Strength and Recyclability

Wang

Bai

Sun

et al. 2022

IJMS

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“…It was found that PC containing 7–10 wt% of PC‐ b ‐PDMS appeared to have an optimal mechanical property combined with improved moldability during processing. As for PC‐ b ‐PDMS and PVC, PC can be compatible with PVC due to its polarity and PDMS is flexible rubber with a low glass transition temperature, which is much lower than that of the current impact modifiers 15,16 . Therefore, PC‐ b ‐PDMS is able to toughen PVC even at low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…As for PC-b-PDMS and PVC, PC can be compatible with PVC due to its polarity and PDMS is flexible rubber with a low glass transition temperature, which is much lower than that of the current impact modifiers. 15,16 Therefore, PC-b-PDMS is able to toughen PVC even at low temperature. In this work, these PVC impact modifiers mentioned above will be compared with PC-b-PDMS on toughening effect.…”

mentioning

confidence: 99%

Comparison of toughening effects of several common toughening agents and polycarbonate‐polydimethylsiloxane block copolymer on polyvinyl chloride

Wang

Zhang

Chen³

2023

Polymers for Advanced Techs

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In this work, different toughening agents such as chlorinated polyethylene (CPE), acrylonitrile–styrene‐acrylate (ASA) terpolymer, acrylic modifier (ACR, the main component is poly(methyl methacrylate‐butyl acrylate)) and polycarbonate‐polydimethylsiloxane block copolymer (PC‐b‐PDMS) were used to toughen polyvinyl chloride (PVC). Different content toughening agents (10 and 20 phr) were added into PVC and their properties were tested. The results exhibited that ACR, ASA, and PC‐b‐PDMS‐40 (40% PDMS content) had high impact strength (more than 100 kJ m−2) at room temperature. With the decrease of temperature, the toughening effect of ACR and ASA dropped significantly (7.30 and 3.69 kJ m−2 at −30°C respectively), while PC‐b‐PDMS‐40 still had certain toughening effect (19.66 kJ m−2 at −30°C). The tensile and flexural strength of blends decreased with the addition of toughening agents, while due to strong interactions between PC and PVC, elongation at break of PVC/PC‐b‐PDMS also have obvious drop. Heat distortion temperature results showed that the heat resistance of PVC was not reduced by toughening agents except CPE. The DMTA curves of blends revealed the reason why PVC/PC‐b‐PDMS‐40 had good toughness at low temperature that the glass transition temperature of PDMS is very low (−123°C), which makes it flexible at low temperature.

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“…Elastomers have numerous applications in various fields, including the automotive and medical industries, due to their unique properties, represented mainly by an excellent rubber elasticity . With the continuous advancement of nanotechnology, ultrathin elastomer films have been developed for use in a range of emerging applications, such as flexible skin contact devices and biomaterials, due to their high flexibilities and excellent adhesive properties. − In general, the viscoelastic properties of ultrathin polymer films with thicknesses less than ∼100 nm deviate from those of the bulk due to the surface and interface effects, in addition to the confinement effect. − As such, the viscoelastic properties of ultrathin elastomer films must be systematically investigated to achieve their successful application; however, such properties remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Swelling Behaviors of Ultrathin Chemically Cross-Linked Polybutadiene Films

et al. 2023

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With the advancement of nanoscience and nanotechnology, understanding the unique mechanical properties of ultrathin polymer films is becoming increasingly important. We report the mechanical properties and swelling behaviors of ultrathin chemically cross-linked polybutadiene films. Upon reducing the film thickness, the Young's modulus increased, and an unusual stress-relaxation behavior was observed. After stress relaxation, the fully relaxed modulus was significantly higher than that expected from the amount of added cross-linker and the entanglement degree. The out-of-plane swelling of the ultrathin films prepared on a substrate was comparable to that in the bulk, whereas the in-plane swelling of films floating on water was significantly suppressed. Such suppression of the in-plane deformation may be attributed to the effects of interface-induced orientations of the chains and the chain segments trapped at the interfaces acting as pseudo-cross-linking points. This study contributes to an understanding of the physical properties of ultrathin cross-linked elastomer films.

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Preparation and characterization of highly elongated polydimethylsiloxane nanosheets

Cited by 7 publications

References 27 publications

Polysiloxane-Based Polyurethanes with High Strength and Recyclability

Polysiloxane-Based Polyurethanes with High Strength and Recyclability

Comparison of toughening effects of several common toughening agents and polycarbonate‐polydimethylsiloxane block copolymer on polyvinyl chloride

Mechanical Properties and Swelling Behaviors of Ultrathin Chemically Cross-Linked Polybutadiene Films

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