High-expansion-ratio PLLA/PDLA/HNT composite foams with good thermally insulating property and enhanced compression performance via supercritical CO2

Wang, Yao; Guo, Fengjiao; Liao, Xia; Li, Shaojie; Yan, Zhihui; Zou, Fangfang; Peng, Qianyun; Li, Guangxian

doi:10.1016/j.ijbiomac.2023.123961

Cited by 12 publications

(2 citation statements)

References 51 publications

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“…Referring to Figure S7, HCs are melted and converted to SCs, affecting their rheological behavior, which will not be discussed too much. Based on the previous works of others, , we consider that the rheological behavior of PPFs could still reflect the evolutionary trend of the internal SCs networks to a certain extent.…”

Section: Resultsmentioning

confidence: 99%

Porous Poly(l-lactide)/Poly(d-lactide) Blend Film with Enhanced Flexibility and Heat Resistance via Constructing a Regularly Oriented Pore Structure

Hou,

Jia,

Pan

et al. 2023

Macromolecules

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Developing eco-friendly polymers, such as poly-(lactic acid) (PLA), is a hopeful strategy to reduce the dependence on petroleum-based polymers and alleviate the "white pollution" crisis. Nonetheless, the manufacture of high-performance biodegradable films remains a major challenge, which are lightweight, highly porous, and combine favorable flexibility with excellent thermal stability. Herein, brand-new porous PLA films with enhanced flexibility and heat resistance are successfully prepared via a simple combination of blade coating and thermally induced phase separation without damaging the environmental protection advantage. The elongation at break of the prepared pure poly(Llactide) film can reach 45.5%. Thanks to enhanced crystallization ability of stereocomplex crystals, leaf vein-like-oriented pores are obtained, finally resulting in flexible poly(L-lactide)/poly(D-lactide) blend films (elongation at break of 10−40%) with improved mechanical properties and high porosity. For example, the 50/50 blend film has the elongation at break of 10.4%, tensile strength of 4.1 MPa, specific modulus of 328.2 MPa cm 3 g −1 , porosity of 90.1%, and pore size range of 0−10 μm. Additionally, the improved crystallinity significantly enhances the films' heat resistance, and the T 5% and T MAX of the 50/50 blend film increased by 32 and 16 °C, respectively, compared with those of the pure film. This work will open up a new path for the use of PLA in microfiltration, packaging, and modified applications.

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Section: Resultsmentioning

confidence: 99%

Porous Poly(l-lactide)/Poly(d-lactide) Blend Film with Enhanced Flexibility and Heat Resistance via Constructing a Regularly Oriented Pore Structure

Hou,

Jia,

Pan

et al. 2023

Macromolecules

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“…Compared to bulky polymeric materials, polymer foams present many advantages depending on the specific application, such as low density, lower cost associated with a lower use of polymeric material, good heat and sound insulation, higher cushioning effect in the packaging of sensitive products, and high specific strength, among others [2][3][4]. Due to these advantages, polymeric foams have increasingly more practical applications in modern day life, namely in thermal insulation [5,6], in protective packaging [7][8][9], in cushioning [7,10,11], or in the health sector, in the development of scaffolds for applications in tissue engineering [12,13]. These applications come from the properties of polymeric foams compared to the properties of bulk polymeric solid materials, namely lower thermal conductivity, lower density without losing mechanical strength, porosity, and interconnected pores, essential in this last case for biocompatibility with living tissues [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Forefront Research of Foaming Strategies on Biodegradable Polymers and Their Composites by Thermal or Melt-Based Processing Technologies: Advances and Perspectives

Gonçalves,

Reis,

Fernandes

2024

Polymers

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The last few decades have witnessed significant advances in the development of polymeric-based foam materials. These materials find several practical applications in our daily lives due to their characteristic properties such as low density, thermal insulation, and porosity, which are important in packaging, in building construction, and in biomedical applications, respectively. The first foams with practical applications used polymeric materials of petrochemical origin. However, due to growing environmental concerns, considerable efforts have been made to replace some of these materials with biodegradable polymers. Foam processing has evolved greatly in recent years due to improvements in existing techniques, such as the use of supercritical fluids in extrusion foaming and foam injection moulding, as well as the advent or adaptation of existing techniques to produce foams, as in the case of the combination between additive manufacturing and foam technology. The use of supercritical CO2 is especially advantageous in the production of porous structures for biomedical applications, as CO2 is chemically inert and non-toxic; in addition, it allows for an easy tailoring of the pore structure through processing conditions. Biodegradable polymeric materials, despite their enormous advantages over petroleum-based materials, present some difficulties regarding their potential use in foaming, such as poor melt strength, slow crystallization rate, poor processability, low service temperature, low toughness, and high brittleness, which limits their field of application. Several strategies were developed to improve the melt strength, including the change in monomer composition and the use of chemical modifiers and chain extenders to extend the chain length or create a branched molecular structure, to increase the molecular weight and the viscosity of the polymer. The use of additives or fillers is also commonly used, as fillers can improve crystallization kinetics by acting as crystal-nucleating agents. Alternatively, biodegradable polymers can be blended with other biodegradable polymers to combine certain properties and to counteract certain limitations. This work therefore aims to provide the latest advances regarding the foaming of biodegradable polymers. It covers the main foaming techniques and their advances and reviews the uses of biodegradable polymers in foaming, focusing on the chemical changes of polymers that improve their foaming ability. Finally, the challenges as well as the main opportunities presented reinforce the market potential of the biodegradable polymer foam materials.

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Lightweight, Strong and High Heat-Resistant Poly(lactide acid) Foams via Microcellular Injection Molding with Self-Assembly Nucleating Agent

Bing,

Ma,

et al. 2024

Chin J Polym Sci

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High-expansion-ratio PLLA/PDLA/HNT composite foams with good thermally insulating property and enhanced compression performance via supercritical CO2

Cited by 12 publications

References 51 publications

Porous Poly(l-lactide)/Poly(d-lactide) Blend Film with Enhanced Flexibility and Heat Resistance via Constructing a Regularly Oriented Pore Structure

Porous Poly(l-lactide)/Poly(d-lactide) Blend Film with Enhanced Flexibility and Heat Resistance via Constructing a Regularly Oriented Pore Structure

Forefront Research of Foaming Strategies on Biodegradable Polymers and Their Composites by Thermal or Melt-Based Processing Technologies: Advances and Perspectives

Lightweight, Strong and High Heat-Resistant Poly(lactide acid) Foams via Microcellular Injection Molding with Self-Assembly Nucleating Agent

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