Ultra-fast degradable PBAT/PBS foams of high performance in compression and thermal insulation made from environment-friendly supercritical foaming

Li, Yanting; Zhang, Ziyan; Wang, Weimiao; Gong, Pengjian; Yang, Qi; Park, Chul; Li, Guangxian

doi:10.1016/j.supflu.2021.105512

Cited by 45 publications

(25 citation statements)

References 42 publications

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“…For an organic adsorbent, a porous structure with connected pores is required. However, supercritical CO 2 (scCO 2 ) foaming commonly produces microcellular foams with a closed-cell structure. , Reducing the polymer matrix strength is beneficial to break cell walls for an open-cell structure, but a low matrix strength also decreases porosity due to the difficulty of stabilizing the open-cell structure. Furthermore, the fast diffusion speed of CO 2 accelerates the collapse of the open-cell structure.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Liu

et al. 2022

ACS Appl. Nano Mater.

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Green amphiphilic decontamination materials with high-performance, ultrafast, and highly efficient liquid contamination adsorption are of great significance to environmental protection. In this work, an ethylene-vinyl alcohol copolymer with both hydrophilic and hydrophobic chain fragments was selected as the matrix (amphiphilic adsorption), a topological grafting structure was designed for chain entanglement (to enhance fiber integrity), and then the aggregate structure was controlled with a soft dispersed phase (to facilitate fiber formation). Finally, environmental-friendly supercritical CO2 foaming is used to obtain the three-dimensional (3D) polymer nanofiber structures (to increase fiber-structure porosity) for liquid contamination adsorption. The strategy takes full advantage of the synergistic effect from the multi-scale structure, including the random copolymer structure (repeating unit scale in the molecular chain), topological structure (molecular chain scale), microphase separation structure (aggregate scale), and nanofiber structure (porous scale). The obtained adsorption amphiphilic material adsorbed liquid contamination with a high efficiency of 64.78 g/g and a large adsorption rate of 1.14 g/g·s–1 (kinetic constant) for carbon tetrachloride, attributing to its unique 3D polymer nanofiber structure with a large specific surface area and a large amount of porous space to adhere and to be filled by liquid contamination, respectively. This work provided a strategy for the green preparation of environment-friendly and high-performance decontamination materials.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Liu

et al. 2022

ACS Appl. Nano Mater.

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“…Cross-link and long-chain branch structures would strengthen the macromolecular interactions among molecular chains and hence limit their mobility; , the presence of graphene would strengthen the interactions between graphene surfaces with molecular chains and hence also limits their mobility. , The above effects from cross-link structures, long-chain branch structures, and graphene hence all improve the viscosities and elasticities of blend melts. Rheological measurement is the most commonly used test method to analyze the linear viscoelasticity of polymers which is very sensitive to molecular movements.…”

Section: Resultsmentioning

confidence: 99%

Graphene-Embedded Hybrid Network Structure to Render Olefin Block Copolymer Foams with High Compression Performance

Liu

Gong

et al. 2022

Ind. Eng. Chem. Res.

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Graphene has abundant interactions with polymers by adhering to macromolecular chain segments, facilitating heterogeneous crystal nucleation and adsorbing free radicals. Hence, a hierarchical network structure using graphene as the anchor could be formed in an olefin block copolymer (OBC)/low-density polyethylene (LDPE) blend together with cross-linking points and entanglement points. Then, a nanocomposite foam was fabricated by supercritical CO2 foaming. In this work, a graphene-embedded hybrid network structure was designed to effectively control OBC/LDPE foaming. The strategy is as follows: (1) Macromolecular free radicals triggered by peroxide were adsorbed on the surface of graphene to form a dentritic-on-plate structure. (2) Both OBC and LDPE molecular chain segments were adhered to graphene to form a hybrid physical network. (3) Long-branched chains of LDPE formed entanglement points with both molecular chains whose segments adhered to graphene and macromolecular free radicals adsorbed on graphene. Finally, an optimized graphene content of 0.5 wt % in the obtained nanocomposite foam would maximize its compression stability (hysteresis loss of 53%) with a high resilience of 60%.

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“…With increasing saturation pressure, the cell size gradually decreases and becomes more uniform compared with that of samples foamed at lower saturation pressure. This is because the CO 2 solubility in the TPU matrix increases with increasing saturation pressure, resulting in a larger supersaturation degree after depressurization, which indicates more bubble nucleation. , Therefore, with increasing saturation pressure, the cell density ( N f ) increases, and correspondingly, both the cell size ( D ) and cell wall thickness ( d w ) decrease. The specific microcellular structure parameters are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

Construction of a Two-Dimensional Response Network in Three-Dimensional Composites to Dramatically Enhance Sensor Sensitivity: A Simple, Feasible, and Green Regulating Strategy

Zhang

Meng

et al. 2022

Ind. Eng. Chem. Res.

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A simple, feasible, and environmentally friendly method for supercritical fluid-assisted construction of a two-dimensional (2D) response network in three-dimensional (3D) composites is proposed to improve sensor performance so as to meet the requirement of new-generation strain sensors including high sensitivity, large strain range, and other auxiliary properties, such as light weight and thermal insulation. The mechanism is that cell wall stretching in the supercritical fluid foaming process changes the conductive fiber dispersive status by eliminating agglomeration and facilitating orientation in 3D cells. For the thermoplastic polyurethane (TPU)/carbon nanofiber (CNF) foam strain sensors manufactured in this work, there is an optimal cellular structure, that is, an optimal 2D response network in 3D composites to maximize sensitivity, and the gauge factor (GF) of the foamed TPU/CNF strain sensor is increased by 89 times compared to that of the unfoamed composite, together with increased thermal insulation and lightweight performance than the unfoamed composite. The obtained TPU/CNF foam strain sensor shows good stability and repeatability in human motion detection. To enlighten the structural design, a 2D response network model in a 3D foam for a foam strain sensor is established for the first time. The model reveals that filler content and aspect ratio are the key points to regulate the response network and there is an optimal value for these two factors to maximize the sensitivity in a foam strain sensor. Therefore, the knowledge on foam strain sensors based on the experimental and theoretical results in this work provides a new structural design strategy for sensing materials and guides the optimization of the sensing structure to improve sensor sensitivity.

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Ultra-fast degradable PBAT/PBS foams of high performance in compression and thermal insulation made from environment-friendly supercritical foaming

Cited by 45 publications

References 42 publications

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Three-Dimensional Polymer Nanofiber Structures for Liquid Contamination Adsorption

Graphene-Embedded Hybrid Network Structure to Render Olefin Block Copolymer Foams with High Compression Performance

Construction of a Two-Dimensional Response Network in Three-Dimensional Composites to Dramatically Enhance Sensor Sensitivity: A Simple, Feasible, and Green Regulating Strategy

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