Curing Kinetics and Structure-Property Relationship of Moisture-Cured One-Component Polyurethane Adhesives

Moon, Hojun; Park, Jeong Eun; Cho, Woongbi; Jeon, Jaecheol; Wie, Jeong Jae

doi:10.1016/j.eurpolymj.2023.112579

Cited by 4 publications

(1 citation statement)

References 39 publications

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“…At present, the development of electronic appliances has a great demand for thermal management materials, primarily consisting of thermosetting polymer composites such as silicone, epoxy resin, and polyurethane. 45,46 The common feature of these matrices is that they cannot be recycled after use and must be discarded, which wastes not only a lot of polymer resources, but also a large quantity of thermally conductive inorganic fillers such as aluminum oxide, boron nitride, aluminum nitride, etc. The thermally conductive polymer composites with covalent–noncovalent interpenetrating networks prepared in this work can achieve closed-loop chemical recycling.…”

Section: Resultsmentioning

confidence: 99%

Recyclable and elastic highly thermally conductive epoxy-based composites with covalent–noncovalent interpenetrating networks

Luo,

Cui,

Zou

et al. 2024

Mater. Horiz.

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Section: Resultsmentioning

confidence: 99%

Recyclable and elastic highly thermally conductive epoxy-based composites with covalent–noncovalent interpenetrating networks

Luo,

Cui,

Zou

et al. 2024

Mater. Horiz.

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Preparation of High-Performance One-Component Polysulfide Adhesives by Regulating Microphase Separation with Diisocyanate-Terminated Prepolymers and 1,4-Butanedithiol

Han,

Zhao,

Chang

et al. 2024

ACS Appl. Polym. Mater.

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The bad compatibility of liquid polysulfide (component A) and solid fillers (component B) induced an unsatisfactory curing or enhancement effect, which will lead to oil leakage, which limits their further application in aircraft fuel tank sealing. Onecomponent curing by inserting a polyurethane structure into the polysulfide system is a viable approach to overcome the above shortcomings. In this work, a series of one-component polysulfide adhesives (OCPSs) were successfully prepared by using 1,4butanedithiol (BSO) to replace 1,4-butanediol (BDO) as a chain extender, and their chemical structures, mechanical properties, thermal stability, microphase separation, and solvent resistance were systematically investigated. As expected, moderate microphase separation and more sulfur contents in the system provided OCPSs with better mechanical properties and water resistance. Moreover, OCPS-40 exhibited the best tensile strength, shear strength, and hardness of 22.43 ± 0.70 MPa, 2.47 ± 0.35 MPa, and 88 ± 3 Shore A, with 23.12-, 2.69-, and 1.32-fold improvement over the two-component polysulfide adhesives (TCPS-1225), respectively. Notably, the tensile strength of OCPS-40 could still reach 16.99 ± 0.80 and 14.87 ± 0.30 MPa after immersion in oil and water for 21 days, respectively. We believe that our paradigm can provide a feasible approach for designing high-performance one-component polysulfide adhesives.

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Synthesis and Properties of Functional Polycarbonate Polyurethane Networks Based on Star-shaped Polycarbonate Polyols

Liu,

Miao,

Leng

et al. 2024

Preprint

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While much research has been developed on polycarbonate polyurethanes (PCUs) based on trimethylene carbonate, there is a dearth of effort in functional PCU networks. In this study, we attempted to introduce a class benzene ring functional cyclic carbonate monomer to prepare PCUs with self-healing, reprocessable, and excellent mechanical properties. Firstly, we prepared functional hydroxyl-terminated 3-arm star-shaped polycarbonate polyols by ring-opening polymerization, in which the molar ratios of trimethylene carbonate (TMC) and cyclic carbonate (PTO) were varied. Then, the PCU networks were prepared from polycarbonate polyols and hexamethylene diisocyanate, with stannous octoate (Sn(Oct)2) as the catalyst. All PCUs were then subjected to DSC, DMA, and uniaxial tensile testing. The results exhibited that the values of Tg and tensile strength increased with increasing the content of PTO. When the molar content of PTO reaches 25%, the tensile strength of the material is 19.6 MPa, which is a significant increase of 227% compared to the PTMC without adding PTO monomer. Under the influence of catalyst, the urethane bonds exchange within PCUs enables effective self-healing properties and reprocessability. This study offers a feasibility assessment for the design of a functional PCU material with excellent properties.

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Curing Kinetics and Structure-Property Relationship of Moisture-Cured One-Component Polyurethane Adhesives

Cited by 4 publications

References 39 publications

Recyclable and elastic highly thermally conductive epoxy-based composites with covalent–noncovalent interpenetrating networks

Recyclable and elastic highly thermally conductive epoxy-based composites with covalent–noncovalent interpenetrating networks

Preparation of High-Performance One-Component Polysulfide Adhesives by Regulating Microphase Separation with Diisocyanate-Terminated Prepolymers and 1,4-Butanedithiol

Synthesis and Properties of Functional Polycarbonate Polyurethane Networks Based on Star-shaped Polycarbonate Polyols

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