Solid-State Surface Patterning on Polymer Using the Microcellular Foaming Process

This study proposes a novel process that integrates the molding and patterning of solid-state polymers with the force generated from the volume expansion of the microcellular-foaming process (MCP) and the softening of solid-state polymers due to gas adsorption. The batch-foaming process, which is one of the MCPs, is a useful process that can cause thermal, acoustic, and electrical characteristic changes in polymer materials. However, its development is limited due to low productivity. A pattern was imprinted on the surface using a polymer gas mixture with a 3D-printed polymer mold. The process was controlled with changing weight gain by controlling saturation time. A scanning electron microscope (SEM) and confocal laser scanning microscopy were used to obtain the results. The maximum depth could be formed in the same manner as the mold geometry (sample depth: 208.7 μm; mold depth: 200 μm). Furthermore, the same pattern could be imprinted as a layer thickness of 3D printing (sample pattern gap and mold layer gap: 0.4 mm), and surface roughness was increased according to increase in the foaming ratio. This process can be used as a novel method to expand the limited applications of the batch-foaming process considering that MCPs can impart various high-value-added characteristics to polymers.

[1]  Zhaozhi Wang,et al.  Lightweight, low-shrinkage and high elastic poly(butylene adipate-co-terephthalate) foams achieved by microcellular foaming using N2 & CO2 as co-blowing agents , 2022, Journal of CO2 Utilization.

[2]  Patrick C. Lee,et al.  Extruded polypropylene foams with radially gradient porous structures and selective filtration property via supercritical CO2 foaming , 2022, Journal of CO2 Utilization.

[3]  R. Hasanzadeh,et al.  Cost-effective and reproducible technologies for fabrication of tissue engineered scaffolds: The state-of-the-art and future perspectives , 2022, Polymer.

[4]  Youngjae Ryu,et al.  Modeling and Experiment for the Diffusion Coefficient of Subcritical Carbon Dioxide in Poly(methyl methacrylate) to Predict Gas Sorption and Desorption , 2022, Polymers.

[5]  Chul B. Park,et al.  Scalable Fabrication of Microcellular Open‐Cell Polymer Foams , 2021, Advanced Engineering Materials.

[6]  Chul B. Park,et al.  The critical requirement for high-pressure foam injection molding with supercritical fluid , 2021, Polymer.

[7]  E. Solórzano,et al.  Analysis of the retrograde behavior in PMMA-CO2 systems by measuring the (effective) glass transition temperature using refractive index variations , 2021 .

[8]  C. Park,et al.  A Comparison of CO2 and N2 Foaming Behaviors of PP in a Visualization System , 2020, International Polymer Processing.

[9]  R. Hasanzadeh,et al.  Increasing cell density/decreasing cell size to produce microcellular and nanocellular thermoplastic foams: A review , 2020 .

[10]  B. C. Kweon,et al.  Energy Harvesting of Ionic Polymer-Metal Composites Based on Microcellular Foamed Nafion in Aqueous Environment , 2020, Actuators.

[11]  L. Lona,et al.  Porous nanocellulose gels and foams: Breakthrough status in the development of scaffolds for tissue engineering , 2020, Materials Today.

[12]  A. Gandhi,et al.  Recent advancements in manufacturing technologies of microcellular polymers: a review , 2020, Journal of Polymer Research.

[13]  Guangxian Li,et al.  Fabrication of lightweight and flexible silicon rubber foams with ultra-efficient electromagnetic interference shielding and adjustable low reflectivity , 2020 .

[14]  Youngjae Ryu,et al.  Reflectance According to Cell Size, Foaming Ratio and Refractive Index of Microcellular Foamed Amorphous Polymer , 2019, International journal of molecular sciences.

[15]  Chul B. Park,et al.  Solubility and diffusivity of CO2 and N2 in TPU and their effects on cell nucleation in batch foaming , 2019 .

[16]  Youngjae Ryu,et al.  Effect of foaming processes on the reduction of warpage in glass fiber reinforced plastic composites , 2019, Journal of Mechanical Science and Technology.

[17]  Chul B. Park,et al.  Accurate theoretical modeling of cell growth by comparing with visualized data in high-pressure foam injection molding , 2019, European Polymer Journal.

[18]  L. Hua,et al.  Mechanism of Bubble Formation in a Combined In-Mold Decoration and Microcellular Foaming Injection Molding Process , 2019, Fibers and Polymers.

[19]  Youngjae Ryu,et al.  Effects of Gas Adsorption on the Mechanical Properties of Amorphous Polymer , 2019, Polymers.

[20]  F. Wang,et al.  Three dimensional macroporous hydroxyapatite/chitosan foam-supported polymer micelles for enhanced oral delivery of poorly soluble drugs. , 2018, Colloids and surfaces. B, Biointerfaces.

[21]  Chul B. Park,et al.  Ultralow-Threshold and Lightweight Biodegradable Porous PLA/MWCNT with Segregated Conductive Networks for High-Performance Thermal Insulation and Electromagnetic Interference Shielding Applications. , 2018, ACS applied materials & interfaces.

[22]  E. Maio,et al.  Foaming of polymers with supercritical fluids and perspectives on the current knowledge gaps and challenges , 2017 .

[23]  M. Rodríguez-Pérez,et al.  Key Production Parameters to Obtain Transparent Nanocellular PMMA , 2017 .

[24]  Chul B. Park,et al.  Ultra-tough and super thermal-insulation nanocellular PMMA/TPU , 2017 .

[25]  Chul B. Park,et al.  Study of the foaming mechanisms associated with gas counter pressure and mold opening using the pressure profiles , 2017 .

[26]  R. Dehoff,et al.  Solidification and solid-state transformation sciences in metals additive manufacturing * , 2017 .

[27]  F. Ronkay,et al.  The effect of mold temperature on chemical foaming of injection molded recycled polyethylene-terephthalate , 2017 .

[28]  N. Suh.  Challenges in Designing and Implementing Large Systems (Overcoming Cost Overruns and Missed Project Schedules) , 2016 .

[29]  M. H. N. Famili,et al.  A Review on the Application of Nucleation Theories in Thermoplastic Foams , 2016 .

[30]  Chul B. Park,et al.  Development of high void fraction polylactide composite foams using injection molding: Crystallization and foaming behaviors , 2015 .

[31]  Chul B. Park,et al.  Poly (lactic acid) foaming , 2014 .

[32]  Wei Li,et al.  Fabrication of a three-dimensional tissue model microarray using laser foaming of a gas-impregnated biodegradable polymer , 2014, Biofabrication.

[33]  C. Panayiotou,et al.  Simultaneous determination of sorption, heat of sorption, diffusion coefficient and glass transition depression in polymer–CO2 systems , 2011 .

[34]  Kuan-Han Liu,et al.  The effect of carbonyl group on sorption of CO2 in glassy polymers , 2003 .

[35]  Jonathan S. Colton,et al.  The nucleation of microcellular thermoplastic foam with additives: Part I: Theoretical considerations , 1987 .