Micropatterning of Porous Structures from Co/Continuous Polymer Blends

Zhang, Wei; Li, Min; Wang, Chaosheng; Zhou, Jack G.; Yao, Donggang

doi:10.1002/adv.21260

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…Xu et al [20] introduced a micropowder imprinting (µPI) process to fabricate the thin yttria-stabilized zirconia sheet with micropatterns. For polymeric powders, Zhang et al [21] combined co-continuous polymer blending with hot embossing, a widely used micropatterning technique, and demonstrated the feasibility of the fabrication of micropatterned porous devices with controllable morphology. In Maksimkin's research [22], porous and multilayer ultra-high molecular weight polyethylene (PE) scaffolds with nonporous bulk layer and porous layer that mimics cancellous bone architecture were obtained by solid-state mixing, thermopressing and washing in subcritical water.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on a novel roll-to-roll powder hot embossing for large-area fabrication of micropyramid arrays on polymers

Deng

Shu

et al. 2018

J. Micromech. Microeng.

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Roll-to-roll (R2R) hot embossing is regarded as a cost-effective replication technology to fabricate microstructures on polymer films. However, the characteristics of continuous and fast forming for the R2R hot embossing process limits material flow during the filling stage and results in significant springback during the demolding stage. To resolve this issue, this study proposed a novel R2R powder hot embossing process, which combines the merits of the continuous fabrication of R2R hot embossing and near-net-shape forming of powder sintering and also decreases the whole cycle of the fabrication from films to microstructures. First, the relation between the molten layer thickness and processing parameters was discussed and an analytical model was established to predict the feed of the polymeric powder during R2R powder hot embossing. Then, with the use of a micro-pyramid array mold, the impact of the process parameters including mold temperature, feeding speed and applied force on the geometrical dimension of the patterned microstructures was discussed. Last, based on the response surface analysis, a process window, in terms of the mold temperature of 132 °C –145 °C, feeding speed of 0.1–1.4 m min−1 and applied force of 15–50 kgf was determined for the continuous fabrication of completely-filled micropyramid arrays with the R2R powder hot embossing process. This research demonstrated the feasibility and superiority of the proposed R2R powder hot embossing process in continuously fabricating micropatterned structures on polymeric films.

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Section: Introductionmentioning

confidence: 99%

Experimental studies on a novel roll-to-roll powder hot embossing for large-area fabrication of micropyramid arrays on polymers

Deng

Shu

et al. 2018

J. Micromech. Microeng.

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Modeling and Simulation of the Process for the Generation of Gradient Porous Structures From Immiscible Polymer Blends

Shen

Yao

Zhang

et al. 2020

Journal of Manufacturing Science and Engineering

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There has been growing interest in integrating gradient porous structures into synthetic materials like polymers. One particular method for making gradient porous polymers is nonisothermal annealing of co-continuous phase structures of immiscible polymer blends under well-defined thermal boundary conditions. In this paper, we report a method to simulate this nonisothermal phase coarsening process for the generation of gradient-phase structures by the combined implementation of phase-field transport and momentum transport. Specifically, a phase-field equation is solved first to obtain a phase structure with phase size comparable with that of the blend to be annealed. This phase structure is then used as an initial geometry in a two-phase moving-interface flow simulation to gauge into the phase structure coarsening process. Several case studies were performed, and the results show that the controllable generation of gradient-phase structures can be enabled by well-designed geometry and thermal boundary conditions. Using 2D simulations, different types of gradient-phase structures experimentally observed were predicted. With increasing power in computation, the capability of 3D simulation may be unveiled for a more accurate prediction of the nonisothermal phase coarsening process and may ultimately evolve into a useful tool for the design and processing of gradient porous polymers.

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Micropatterning of Porous Structures from Co/Continuous Polymer Blends

Cited by 2 publications

References 40 publications

Experimental studies on a novel roll-to-roll powder hot embossing for large-area fabrication of micropyramid arrays on polymers

Experimental studies on a novel roll-to-roll powder hot embossing for large-area fabrication of micropyramid arrays on polymers

Modeling and Simulation of the Process for the Generation of Gradient Porous Structures From Immiscible Polymer Blends

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