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359 results on '"Luo, Yingwu"'

10. Digitally Programmable Microphase Separation in Polymer Network Generates Microstructure Pattern

Author

Liu, Bohan, Chen, Zheqi, Zhao, Junjie, Gao, Xiang, and Luo, Yingwu

Abstract

Polymers with microstructure patterns are crucial to many applications, such as separation, optics, electronics, metamaterials, etc. However, introducing microstructure patterns with diverse morphologies and feature sizes ranging from nanometers to micrometers into large-area polymers remains a significant challenge. Here, we design a material system that enables digital programming microphase separation in a polymer network to generate microstructure patterns. The polymer network is engineered to allow digital programming of local modulus, which arrests the length scale of microphase separation to generate various microstructures. These local modulus-regulated microstructures exhibit either bicontinuous or sea–island morphology and have various feature sizes ranging from ∼100 nm to several micrometers. Using household devices of an ink printer and an ultraviolet light lamp, the microstructure patterns can be programmed with fine resolutions (∼100 μm) over large areas (≫100 mm). The locally varied microstructures have different capabilities to scatter light and result in a visible pattern. We further demonstrate this design with a soft anticounterfeiting device. This approach of digital programming microphase separation in polymer networks is applicable to various polymers and provides a platform for designing many other functional devices.

Published
2024
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12. Dielectric Elastomer Network with Large Side Groups Achieves Large Electroactive Deformation for Soft Robotic Grippers.

Author

Dou, Xiaorong, Chen, Zheqi, Ren, Fuhao, He, Lijun, Chen, Jianxiong, Yin, Li‐Juan, Luo, Yingwu, Dang, Zhi‐Min, and Mao, Jie

Subjects
ELECTROACTIVE substances, POLYMER networks, ALKYL group, SOFT robotics, HELPING behavior, ELASTOMERS
Abstract

Dielectric elastomer actuators (DEAs) face an acknowledged challenge: On the one hand, the majority of elastomers only achieve small electroactive deformation (<20%) in the absence of prestretch; on the other hand, rare elastomers capable of showing large electroactive deformation require relatively complicated processing and chemistry. This work addresses this challenge by fabricating an elastomer with a network of large side groups, which achieves a very large electroactive deformation (218%) without pre‐stretch. This elastomer can be rapidly and massively fabricated within a few min, by polymerizing a commercial monomer with a large alkyl side group. The large side groups in the polymer network repel each other and extend the load‐bearing strands, which results in a pronounced strain‐hardening behavior. This behavior helps the elastomer to get rid of electromechanical instability during actuation and hence to exhibit a large electro‐active deformation, a high energy density (>> human muscle), and a large output force (≈500 times self‐weight). the elastomer capable of manufacturing a soft electroactive gripper is demonstrated with large deformation, large force, and rapid response, which enables grasping fragile objects of various complex shapes in an agile away. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Self-powered soft robot in the Mariana Trench

Author

Li, Guorui, Chen, Xiangping, Zhou, Fanghao, Liang, Yiming, Xiao, Youhua, Cao, Xunuo, Zhang, Zhen, Zhang, Mingqi, Wu, Baosheng, Yin, Shunyu, Xu, Yi, Fan, Hongbo, Chen, Zheng, Song, Wei, Yang, Wenjing, Pan, Binbin, Hou, Jiaoyi, Zou, Weifeng, He, Shunping, Yang, Xuxu, Mao, Guoyong, Jia, Zheng, Zhou, Haofei, Li, Tiefeng, Qu, Shaoxing, Xu, Zhongbin, Huang, Zhilong, Luo, Yingwu, Xie, Tao, Gu, Jason, Zhu, Shiqiang, and Yang, Wei

Published
2021
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26. Morphology and Mechanical Properties of Acrylonitrile-Styrene-Acrylate Toughened Plastics With Block Copolymer Chain Structure

Author

Huang, Jie, Luo, Yingwu, and Gao, Xiang

Subjects
PVH Corp., Clothing industry -- Mechanical properties -- Analysis, Acrylonitrile -- Mechanical properties -- Analysis, Plastics industry -- Mechanical properties -- Analysis, Polymerization -- Mechanical properties -- Analysis, Block copolymers -- Mechanical properties -- Analysis, Displays (Marketing), Copolymers, Nitriles, Engineering and manufacturing industries, Science and technology
Abstract

Acrylonitrile-styrene-acrylate (ASA) toughened plastics based on block copolymers are successfully prepared via RAFT emulsion polymerization and various molecular structures are designed to have different morphologies in order to investigate the relationship between morphologies and mechanical properties. All materials prepared by blending exhibit sea-island morphology. Promoting particles dispersion and increasing spherical particle size shorten surface-to-surface interparticle distance and help to improve tensile properties of materials. Enlarging particles through crosslinked structures are found to be a more effective method to improve tensile toughness, at the cost of a slight reduction in tensile yield strength. Larger spherical particles with crosslinked structures are found to help improving the Izod notched impact strength of materials. However, the existence of a SAN core decreases the material's ability to withstand impact. Compared to blended samples, triblock copolymer materials display higher flexural strength with equal flexural modulus., INTRODUCTION Acrylonitrile-styrene-acrylate (ASA) toughened plastic is similar to acrylonitrile-butadiene-styrene (ABS) in terms of morphology. Due to the lack of double bonds from polybutadiene in the molecular chain, ASA has better [...]

Published
2019
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