Modeling the heat transfer by conduction of nanocellular polymers with bimodal cellular structures

Bernardo, Victoria; León, Judith Martín‐de; Pinto, Javier; Verdejo, Raquel; Rodríguez‐Pérez, Miguel Ángel

doi:10.1016/j.polymer.2018.11.047

Cited by 35 publications

(26 citation statements)

References 47 publications

(81 reference statements)

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“…For low-pressure FIM the resulting component weight-saving is lower however the cell structure of high-pressure foaming shows better microcellular structure [12]. Towards nano-cellular microstructure has proven to improve thermal conductivity due to the Knudsen effect [13,14], improved relevant mechanical strength along with more consistent final parts [15].…”

Section: Introductionmentioning

confidence: 99%

A Novel Hybrid Foaming Method for Low-Pressure Microcellular Foam Production of Unfilled and Talc-Filled Copolymer Polypropylenes

et al. 2019

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Unfilled and talc-filled Copolymer Polypropylene (PP) samples were produced through low-pressure foam-injection molding (FIM). The foaming stage of the process has been facilitated through a chemical blowing agent (C6H7NaO7 and CaCO3 mixture), a physical blowing agent (supercritical N2) and a novel hybrid foaming (combination of said chemical and physical foaming agents). Three weight-saving levels were produced with the varying foaming methods and compared to conventional injection molding. The unfilled PP foams produced through chemical blowing agent exhibited the strongest mechanical characteristics due to larger skin wall thicknesses, while the weakest were that of the talc-filled PP through the hybrid foaming technique. However, the hybrid foaming produced superior microcellular foams for both PPs due to calcium carbonate (CaCO3) enhancing the nucleation phase.

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Section: Introductionmentioning

confidence: 99%

A Novel Hybrid Foaming Method for Low-Pressure Microcellular Foam Production of Unfilled and Talc-Filled Copolymer Polypropylenes

et al. 2019

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“…For example, the thermal conductivity of PBS samples was decreased from 192 ± 3 to 119 ± 5 mW·(m·K) −1 by the foaming process. Bernardo et al [58] reported that the presence of microcells in polymer foams allowed decreasing thermal conductivity through the conduction of solid phase, while nanocells in polymer foams could contribute to decreasing the thermal conductivity via the conduction of gas phase. Besides, the thermal conductivity of gas phase was remarkably decreased in the nanocellular polymer foams compared with that in the microcellular polymer foams due to the reduction of cell size from 1 μm to 100 nm, thus nanocellular CPBS foams have a better thermal insulation property, compared with microcellular PBS foams [2].…”

Section: Resultsmentioning

confidence: 99%

A Facile and Green Approach Toward Preparation of Nanocellular Poly(Butylene Succinate)/Hydroxyl‐Functionalized Graphene Composite Foam Induced by Nonisothermal Crystallization

Zhou

Yin

et al. 2020

Vinyl Additive Technology

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In this article, a facile and green strategy of nonisothermal crystallization induction was proposed to produce nanocellular biodegradable polymer composite foams, which was demonstrated by a composite system of poly(butylene succinate) (PBS) modified by hydroxyl‐functionalized graphene (HG) and chain extender. Nanocellular foams of chain extended PBS (CPBS) and CPBS/HG composite were prepared successfully with supercritical CO2. Two significant phenomena about the preparation of nanobubbles in CPBS and CPBS/HG composite foams were found. One was that the nanobubbles generated at the temperature region of crystallization transition and the other was that chain extension played a critical function in the generation of nanobubbles. As the foaming temperature switched from 86 to 85°C, an interesting microbubble to nanobubble transition in CPBS and CPBS/HG foams was observed. Due to the generation of nanobubbles and the enhancement of volume expansion ratio, an excellent thermal insulation performance was achieved by CPBS/HG foams. J. VINYL ADDIT. TECHNOL., 26:461–474, 2020. © 2020 Society of Plastics Engineers

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“…Industries such as the automotive one or the building sector could improve their current designs by using these materials. However, so as to take advantage of properties, such as the thermal insulation, it is mandatory to reduce the density of the cellular material in addition to the cell size [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Gas Dissolution Foaming as an Approach for Simultaneously Reducing Cell Size and Relative Density in Nanocellular PMMA

León

Bernardo²,

Rodríguez‐Pérez

2021

Polymers

Self Cite

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A new approach to produce nanocellular polymers combining small cell sizes with low relative densities is presented herein. This production method, based on gas dissolution foaming, consists of performing a double saturation and foaming cycle. Thus, nanocellular polymethylmethacrylate (PMMA) has been produced through a first saturation at different saturation conditions (6, 10, and 20 MPa and −32 °C), at constant foaming conditions (60 °C for 1 min). Then, the nanocellular PMMAs obtained from the previous step were again saturated at different saturation conditions, 10 MPa 24 °C, 31 MPa 24 °C, 35 MPa 22 °C, and 6 MPa −15 °C and foamed at different temperatures (40, 80 and 100 °C) for 1 min. This new approach allows the cells created in the first saturation and foaming cycle to further grow in the second cycle. This fact permits producing nanocellular polymethylmethacrylate sheets combining, for the first time in the literature, cell sizes of 24 nm with relative densities of 0.3.

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Modeling the heat transfer by conduction of nanocellular polymers with bimodal cellular structures

Cited by 35 publications

References 47 publications

A Novel Hybrid Foaming Method for Low-Pressure Microcellular Foam Production of Unfilled and Talc-Filled Copolymer Polypropylenes

A Novel Hybrid Foaming Method for Low-Pressure Microcellular Foam Production of Unfilled and Talc-Filled Copolymer Polypropylenes

A Facile and Green Approach Toward Preparation of Nanocellular Poly(Butylene Succinate)/Hydroxyl‐Functionalized Graphene Composite Foam Induced by Nonisothermal Crystallization

Cyclic Gas Dissolution Foaming as an Approach for Simultaneously Reducing Cell Size and Relative Density in Nanocellular PMMA

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