Correlation Between Foam Performance and Molecular Structure of Fully Biodegradable PPC-P Enhanced by Chain Extension

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: 13(1), P. 115292 - 115292

Published: Jan. 5, 2025

Language: Английский

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In-situ cross-linking strategy for achieving excellent impact resistance and thermal insulation of closed-cell poly(lactic acid) (PLA)/poly(4-hydroxybutyrate) (P4HB) foams

International Journal of Biological Macromolecules, Journal Year: 2025, Volume and Issue: unknown, P. 140669 - 140669

Published: Feb. 1, 2025

Language: Английский

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Innovative Enhancement of Mechanical and Thermal Properties of Polylactic Acid Foam by Adjusting Crystallization

Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 18, 2025

Polylactic acid (PLA) foam, known for its biodegradability and biocompatibility, faces limitations due to poor melt viscosity low crystallinity. To address these issues, this research utilizes ethylene‐glycidyl methacrylate copolymer as a chain extender (CE) enhance PLA incorporates the nucleating agent diphenylhydrazide sebacic (ST‐NAB3) adjust crystallization characteristics. The CEPLA/ST‐NAB3 material is developed foamed using supercritical CO 2 an intermittent method. Observations by polarizing microscope differential scanning calorimeter show increases in both rate crystallinity of sample. When ST‐NAB3 content 0.4 wt%, transformation from spherulite string crystal morphology occurs. Rheological tests higher strength compared with pure PLA, thereby improving foaming behavior. temperature 108 °C, foam wt% has smallest cell size highest density, which are 55.38 μm 3.95 × 10 6 cells cm −3 , respectively. Following annealing treatment, compressive containing 5.35 MPa, while Vicat softening rises 87.4 °C. This study offers effective approach performance foams, expanding their potential applications various industries.

Language: Английский

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Integrating Hollow Metal‐Organic Frameworks with Supercritical CO₂: A Path to High‐Performance Polystyrene Microcellular Foams

Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 4, 2025

Polymer foams, particularly those prepared using supercritical carbon dioxide (Sc‐CO 2 ), are extensively utilized in diverse applications like thermal insulation and packaging due to their lightweight efficient properties. However, the effectiveness of Sc‐CO foaming is often limited by low cell density large size, mainly resulting from insufficient nucleation control inadequate gas management. In this study, hollow metal‐organic frameworks (MOFs) (HZIF‐8) were introduced as effective nucleating agents ‐assisted polystyrene (PS) foaming. Owing unique structure high internal surface area, HZIF‐8 significantly enhances adsorption storage capacity, thereby improving efficiency during process. The results show that incorporating into PS increases (up 1.4 × 10 9 cells cm −3 ) decreases average size (to 8.6 μm) under optimal conditions (13.8 MPa, 100 °C). Compared conventional ZIF‐8 nanoparticles, facilitates more CO uptake, leading a finer microcellular morphology, stable foam expansion, enhanced mechanical These demonstrate potential MOFs creating high‐performance with promising energy‐efficient insulation, packaging, functional materials.

Language: Английский

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Preparation of biomass fiber/polylactic acid foam using an oven-type free foaming method for energy savings and performance enhancement

Industrial Crops and Products, Journal Year: 2024, Volume and Issue: 222, P. 119714 - 119714

Published: Sept. 24, 2024

Language: Английский

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