Shiping Zhu
@cuhk.edu.cn
School of Science and Engineering
Chinese University of Hong Kong, Shenzhen
EDUCATION
B.Eng. Zhejiang University, 1982
Ph.D. McMaster University, 1991
RESEARCH INTERESTS
chemical engineering, polymer reaction engineering, catalytic polymerization of olefins, free radical polymerization of acrylics and vinyls, kinetic modeling, process digitalization, smart polymers
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Changgeng Zhang, Zhenwu Wang, He Zhu, Qi Zhang, and Shiping Zhu
Wiley
AbstractOmnipresent vibrations pose a significant challenge to flexible pressure sensors by inducing unstable output signals and curtailing their operational lifespan. Conventional soft sensing materials possess adequate elasticity but prove inadequate in countering vibrations. Moreover, the utilization of conventional highly‐damping materials for sensing is challenging due to their substantial hysteresis. To tackle this dilemma, dielectric gels with controlled in situ microphase separation have been developed, leveraging the miscibility disparity between copolymers and solvents. The resulting gels exhibit exceptional compression stress, remarkable dielectric constant, and exceptional damping capabilities. Furthermore, flexible pressure sensors based on these microphase‐separated gels show a wide detection range and low detection limit, more importantly, excellent sensing performance on vibrating surfaces. This work offers high potentials for applying flexible pressure sensors in complex practical scenarios and opens up new avenues for applications in soft electronics, biomimetic robots, and intelligent sensing.
Jialin Yang, Jierui Wang, Qi Zhang, He Zhu, and Shiping Zhu
Elsevier BV
Le Yao, Chengjiang Lin, Xiaozheng Duan, Xiaoqing Ming, Zhixuan Chen, He Zhu, Shiping Zhu, and Qi Zhang
Springer Science and Business Media LLC
AbstractUnderwater adhesives receive extensive attention due to their wide applications in marine explorations and various related industries. However, current adhesives still suffer from excessive water absorption and lack of spontaneity. Herein, we report an autonomous underwater adhesive based on poly(2-hydroxyethyl methacrylate-co-benzyl methacrylate) amphiphilic polymeric matrix swollen by hydrophobic imidazolium ionic liquid. The as-prepared adhesive is tough and flexible, showing little to none instantaneous underwater adhesion onto the PET substrate, whereas its adhesion energy on the substrate can grow more than 5 times to 458 J·m−2 after 24 hours. More importantly, this process is entirely spontaneous, without any external pressing force. Our comprehensive studies based on experimental characterizations and molecular dynamic simulations confirm that such autonomous adhesion process is driven by water-induced rearrangement of the functional groups. It is believed that such material can provide insights into the development of next-generation smart adhesives.
Tian-Tian Wang, Yin-Ning Zhou, Zheng-Hong Luo, and Shiping Zhu
American Chemical Society (ACS)
Dispersity (Đ) as a critical parameter indicates the level of uniformity of the polymer molar mass or chain length. In the past several decades, the development of explicit equations for calculating Đ experiences a continual revolution. This viewpoint tracks the historical evolution of the explicit equations from living to reversible-deactivation polymerization systems. Emphasis is laid on displaying the charm of explicit Đ equations in batch reversible-deactivation radical polymerization (RDRP), with highlights of the relevant elegant mathematical manipulations. Some representative emerging applications enabled by the existing explicit equations are shown, involving nitroxide-mediated polymerization (NMP), atom transfer radical polymerization (ATRP), and reversible addition-fragmentation chain transfer (RAFT) polymerization systems. Stemming from the several outlined challenges and outlooks, sustained concerns about the explicit Đ equations are still highly deserved. It is expected that these equations will continue to play an important role not only in traditional polymerization kinetic simulation and design of experiments but also in modern intelligent manufacturing of precision polymers and classroom education.
Xiangyang Liu, Qi Zhang, He Zhu, and Shiping Zhu
Wiley
Yuanfeng Wang, Zilin Yu, Jinhao Xie, Lei Ding, Jiechang Liang, Wenqing He, Shiguo Chen, and Shiping Zhu
Wiley
João B. P. Soares, Alexander Penlidis, Hidetaka Tobita, and Shiping Zhu
Wiley
Andrew Nick Hrymak, Robert Pelton, and Shiping Zhu
Wiley
Yichen Wan, Wenlian Qiu, He Zhu, Qi Zhang, and Shiping Zhu
Wiley
AbstractAdhesive materials have been widely used in almost every industrial domain. The art of the design principles of high‐performance adhesives lies in the regulation of adhesion and cohesion strengths. Compared with permanent covalent bonds, dynamic bonds, including dynamic covalent and noncovalent bonds, are vulnerable under mechanical stimuli but rebuildable, making them promising candidates to manipulate the internal and interfacial energy. In this review, we mainly discuss how dynamic bonds can be applied to adhesive materials to regulate adhesion and cohesion, simultaneously. Representative samples are rationally selected to elaborate on the engineering designs for improving the adhesive performance via incorporating dynamic bonds. We also offer a perspective on future research directions on the engineered construction of advanced adhesive materials.
Anton B. Kornberg, Michael R. Thompson, and Shiping Zhu
Wiley
AbstractAn approach based on controlled crazing and post‐polymerization was used to incorporate a nanoscaled conductive co‐continuous network into commercial ENGAGE™ Polyolefin Elastomers (POEs). Three POE films of differing crystallinity and phase morphology were stretched in a reactive mixture of acrylic polymerization precursors that possessed an affinity for the olefinic materials and acted as a surface‐active agent for craze promotion. As a result, a rigid acrylic hydrogel phase was grown in the void space associated with crazing, which prevented the formed channels from collapsing after mechanical stresses were removed. The hydrogel phase offered ion conductivity properties to the POE. Simply replacing the acrylic monomer with an aniline emulsion for polymerization did not lead to the same outcome in terms of a continuous network; the materials became insulative after the removal of mechanical stresses due to fragmentation of the polyaniline channels from the unrestrained elastic relaxation of the POE. This problem was overcome by solution‐casting POE with polycaprolactone (PCL) into films and, subsequently, partially dissolving and leaching PCL from the blend while a sample was stretched in an aniline emulsion medium containing formic acid. The residual PCL left in the crazes reinforced the polyaniline to prevent fragmentation, allowing the formation of a highly electron‐conductive secondary phase.
Jierui Wang, He Zhu, and Shiping Zhu
Elsevier BV
Lei Shi, Zongyi Han, Yixuan Feng, Changgeng Zhang, Qi Zhang, He Zhu, and Shiping Zhu
Elsevier BV
Xiwei Guo, Jiaheng Liang, Zhifen Wang, Jianliang Qin, Qi Zhang, Shiping Zhu, Kun Zhang, and He Zhu
Wiley
Elastomers have many industrial, medical and commercial applications, however, their huge demand raises an important question of how to dispose of the out‐of‐service elastomers. Ideal elastomers that are concurrently tough, recyclable, and degradable are in urgent need, but their preparation remains a rigorous challenge. Herein, a polycaprolactone (PCL) based polyurethane elastomer is designed and prepared to meet this demand. Owing to the presence of dynamic coordination bond and the occurrence of strain‐induced crystallization, the obtained elastomer exhibits a high toughness of ≈372 MJ m−3 and an unprecedented fracture energy of ≈646 kJ m−2, which is much higher than natural rubber (≈50 MJ m−3 for toughness and ≈10 kJ m−2 for fracture energy). In addition, the elastomer can be recycled at least three times using solvent without losing its mechanical properties and can be degraded by lipase in ≈2 months. Finally, biological experiments demonstrate that the elastomer possesses good biocompatibility and can facilitate wound healing in mice when used as sutures. It is believed that the obtained elastomer meets the requirements for next‐generation elastomers and is expected to be used in emerging fields such as biomedicine, flexible electronics, robotics and beyond.
Xiaoqing Ming, Yifeng Sheng, Le Yao, Xiangrui Li, Yangyu Huang, He Zhu, Qi Zhang, and Shiping Zhu
Elsevier BV
Yang Xiang, Xiwei Guo, He Zhu, Qi Zhang, and Shiping Zhu
Elsevier BV
Guoqing Chen, Xiwei Guo, Chang Yang, He Zhu, Qi Zhang, and Shiping Zhu
Elsevier BV
Le Yao, Xiaoqing Ming, Chengjiang Lin, Xiaozheng Duan, He Zhu, Shiping Zhu, and Qi Zhang
Wiley
AbstractDeveloping smart iontronic materials is highly desired for eradicating the widely occurring potential short‐circuit hazard and subsequent safety problems caused by high ambient humidity. In this work, a humidity‐responsive ionogel (HRIG) based on a poly(benzyl methacrylate) matrix swollen by hydrophobic ionic liquid and hygroscopic lithium salt is reported. The HRIG exhibits an anomalous decrease in ionic conductivity upon hydration by increased humidity, totally differing from traditional ionic conductors, which are usually more conductive due to the plasticizing effect of water molecules. This unique ionogel shows a dramatic decrease in ionic conductivity (as much as 102) when exposed to humidity. The conductive pathway within the HRIG would be shut down spontaneously above a critical relative humidity due to water‐induced phase separation. Moreover, this transition can be perfectly reversed when the ambient humidity drops. A humidity‐responsive smart supercapacitor that can be switched on and off by capturing humidity changes is designed for demonstration. It is believed that such unusual HRIG material will provide new insights into the development and applications of smart iontronics.
Jierui Wang, Jialin Yang, He Zhu, Bo-Geng Li, and Shiping Zhu
Elsevier BV
Wenlian Qiu, Yi Huang, He Zhu, Qi Zhang, and Shiping Zhu
Royal Society of Chemistry (RSC)
Ternary random copolymers consisting of chemical features of nonphenolic aromatic groups, cations, and polar side chains enabled excellent underwater adhesion.
Kaka Zhang, Shuaishuai Huang, Qi Zhang, He Zhu, and Shiping Zhu
Wiley
AbstractPolyhedral oligomeric silsesquioxane (POSS)‐based coatings have attracted significant attention from academia and industry over the past decades. The three‐dimensional nano‐sized cage with alternating SiO bonds forms the inorganic core of POSS molecules, while organic functional groups are covalently attached to the Si vertices. With this unique structure, they can be integrated with polymers via different approaches, including physical blending, covalent grafting, and chemical cross‐linking. And the inorganic/organic hybrid nature of POSS offers the coating materials with desirable mechanical, anti‐wetting, anti‐corrosive, icephobic, and fire‐retardant properties. This review focuses on the state‐of‐the‐art developments of POSS‐based functional coatings, while their challenges and future research directions are also discussed.
Xiaoqing Ming, Yang Xiang, Le Yao, Wenqing He, He Zhu, Qi Zhang, and Shiping Zhu
American Chemical Society (ACS)
Ionic switches with a positive temperature coefficient (PTC) effect are highly desirable in the fabrication of smart electrolytes for the safety protection of electrochemical energy devices. However, most of them encounter liquid leaking or volume shrinking problems, limiting their long-term and stable operations. Herein, a PTC-type ionic switch is introduced based on a poly(acrylic acid) (PAA) hydrogel soaked by calcium acetate (CaAc), with a resistance change of six times in maximum between the homogeneous and phase separated state. The PTC effect is owing to the strong phase separation upon heating where the ion transport is restricted. Such a hydrogel-based PTC-type ionic switch is in the solid state and isochoric during phase separation without leaking or shrinking issues. The influence of different CaAc soaking concentrations is investigated. A simplified model consisting of interconnected ion channels is proposed based on microstructure analysis. A smart supercapacitor is successfully demonstrated by this PTC ionic switch with a safety protection ability. The research here would provide a new pathway for the design and development of PTC-type ionic switches in the safety protection of electrochemical energy storage devices.
Zhi-Yong Luo, Dong Wang, Lingqi Huang, Xiangyang Liu, Qi Zhang, He Zhu, and Shiping Zhu
Elsevier BV
Jing Ru, Erlita Mastan, Liyang Zhou, Chunming Shao, Jie Zhao, Shuhua Wang, and Shiping Zhu
American Chemical Society (ACS)
Jierui Wang, Jianliang Qin, He Zhu, Bo‐Geng Li, and Shiping Zhu
Wiley
Yichen Wan, Shuaishuai Huang, Yuxuan Sun, He Zhu, Qingbin Zheng, Qi Zhang, and Shiping Zhu
Elsevier BV