The Aging of Polymers under Electromagnetic Radiation

Polymers, Год журнала: 2024, Номер 16(5), С. 689 - 689

Опубликована: Март 3, 2024

Polymeric materials degrade as they react with environmental conditions such temperature, light, and humidity. Electromagnetic radiation from the Sun’s ultraviolet rays weakens mechanical properties of polymers, causing them to degrade. This study examined phenomenon polymer aging due exposure radiation. The three specific objectives, including key theories explaining (UV) radiation’s impact on decomposition, underlying testing procedures for determining polymeric materials, appraising current technical methods enhancing UV resistance polymers. utilized a literature review methodology understand effect electromagnetic Thus, concluded that using additives absorbers polymers composites can elongate lifespan by shielding effects findings suggest thermal contribute degradation breaking down their physical chemical bonds. Thermal oxidative environments accelerate presence temperatures foster quicker plastics.

Язык: Английский

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Hyperinelasticity, Part II: A stretch-based formulation

Journal of the Mechanics and Physics of Solids, Год журнала: 2024, Номер 192, С. 105825 - 105825

Опубликована: Авг. 13, 2024

A generalisation of the hyperinelasticity modelling framework devised in Part I this sequel is formulated here, by presenting a (principal) stretches-based hyperinelastic deformation energy function WF. This based on premise that stretches λj may assume any arbitrary real-valued exponents, rather than being restricted to prescriptive powers 2 and −2, as principal invariants-based models. The motivation behind extension reduce overall number model parameters thereby increase versatility application framework, well provide more universal model. ensuing then applied wide range extant experimental datasets encompassing foams, glassy semi-crystalline polymers, hydrogels liquid crystal elastomers, over both elastic inelastic ranges including yield, softening plateau, hardening behaviours, under tensile compressive deformations. Upon demonstrating favourable simulation foregoing behaviours model, its extended account for other nuanced aspects inelasticity such effects rate deformation, crystallinity volume angle printing 3D printed lattice structures. augmentation done via devising generalised which allows incorporation generic tensorial (including rank zero scalar) field inelasticity-inducing factors into core resulting evolve with an appropriate measure factor interest; e.g., rate, ratio etc. proposed will be shown capture these proficiently. Given simplicity approach, essentially hyperelasticity, implementation, capturing presented large polymers elastomers.

Язык: Английский

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Reaction strategies of bisphenol A derivatives to regulate the microstructure of polyarylates: synthesis of bisphenol S/bisphenol A random polyarylates and block polyarylates

New Journal of Chemistry, Год журнала: 2024, Номер 48(36), С. 16107 - 16118

Опубликована: Янв. 1, 2024

A series of linear block polymers and random were synthesized by interfacial polycondensation using two bisphenols with similar structures, bisphenol S (BPS) (BPA), terephthaloyl chloride isophthaloyl chloride.

Язык: Английский

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Three-Part Superposition Quasi-Static Stress Model for PTFE Across a Broad Low-Temperature Range Based on ZWT and Higher-Order Stress Corrections

Materials Today Communications, Год журнала: 2024, Номер unknown, С. 110596 - 110596

Опубликована: Окт. 1, 2024

Язык: Английский

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