High-Performance Poly(amide-urea) via a Nonisocyanate Route with Simultaneously Improved Strength and Toughness

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 27, 2025

Language: Английский

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Thermoplastic and Reprocessable Polyureas Synthesized from CO₂-Based Oligourea

ACS Applied Polymer Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Language: Английский

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Thermoplastic Polyureas with Excellent Mechanical Properties Synthesized From CO₂‐Based Oligourea

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: April 30, 2025

Polyureas (PUas) are versatile polymers with a wide range of applications in areas such as coatings, construction, automotive, and aerospace. The isocyanate index (R index) refers to the molar ratio equivalent number groups (─NCO) total amino (─NH2) or hydroxyl (─OH) synthesis PUas polyurethanes. relationship between R material properties is less explored PUa chemistry. Moreover, traditional thermosets without recyclability reprocessability, hindering broader industrial adoption. Herein, series thermoplastic excellent mechanical thermal prepared from CO2-based oligourea (OUa) 4,4'-diphenylmethane diisocyanate (MDI) different indices = 1, 1.05, 1.11). has significant impact on structure molecular weight PUas, thereby significantly affecting their stability. When synthesized (PUa-1.05) exhibits best overall performance, high tensile strength ≈75 MPa, Young's modulus ≈1100 toughness ≈104 MJ·m-3, great reprocessing capacities. In addition, possess stability, an initial decomposition temperature 312 °C.

Language: Английский

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Synthesis of CO2-Based Re-processable Slight Cross-Linked Polyurea Thermosets

Chinese Journal of Organic Chemistry, Journal Year: 2024, Volume and Issue: 44(10), P. 3178 - 3178

Published: Jan. 1, 2024

Language: Английский

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