Youping Wu

Beijing University of Chemical Technology

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Liqun Zhang

Beijing University of Chemical Technology

103

Jianping Deng

Beijing University of Chemical Technology

Jun Liu

Beijing University of Chemical Technology

Yiqing Wang

Nanjing University

Zijian Zheng

Hubei University

Yangyang Gao

Hebei North University

Hongchi Tian

Beijing University of Chemical Technology

Jianxiang Shen

Jiaxing University

Nanying Ning

Beijing University of Chemical Technology

Suhe Zhao

Beijing University of Chemical Technology

Cooperative Institutions

Beijing University of Chemical Technology

123

Chinese Academy of Sciences

State Key Laboratory of Organic-Inorganic Composite Materials

University of Chinese Academy of Sciences

Xi'an Jiaotong University

Peking University

South China University of Technology

Tianjin University

Materials Science & Engineering

Tsinghua University

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Double-helical polymer brushes consisting of helical polyacetylene main chain and helical poly(n-hexyl isocyanate) side chains

Synthetic Metals (2014)

Xuan Liu Haiyang Zhang Ru Cheng Jianping Deng Youping Wu

Polyacetylene

Isocyanate

Side chain

Helix (gastropod)

10.1016/j.synthmet.2014.05.023

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Citations (6)

Preparation and properties of natural rubber/rectorite nanocomposites

European Polymer Journal (2005)

Yiqing Wang Huifeng Zhang Youping Wu Jun Yang Liqun Zhang

10.1016/j.eurpolymj.2005.05.019

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Citations (117)

New Understanding of Morphology Evolution of Thermoplastic Vulcanizate (TPV) during Dynamic Vulcanization

ACS Sustainable Chemistry & Engineering (2014)

Hanguang Wu Ming Tian Liqun Zhang Hongchi Tian Youping Wu

Thermoplastic vulcanizates (TPVs) have attracted considerable attention as typical "green" polymers in recent years and have been widely used in industry because they combine the excellent resilience of conventional elastomers and the easy recyclability of thermoplastics. With a new understanding of the formation and agglomeration of the rubber nanoparticles in ethylene propylene diene monomer/polypropylene (EPDM/PP) TPV, we revealed a new mechanism for the morphology evolution of TPV during dynamic vulcanization (DV). The phase inversion in TPV is dominated by the formation and agglomeration of the rubber nanoparticles rather than the elongation and breakup of the cross-linked rubber phase as previously reported. The size of the rubber agglomerates increases with increasing DV time and then remains constant after DV. In addition, we studied the relationship between the cross-linking of the rubber phase, formation and agglomeration of the rubber nanoparticles, and phase inversion and variation of the rubber network during DV. This study provides guidance to control the microstructure of TPV in preparation of high performance TPV products for automobile and electronic applications.

Polypropylene

Thermoplastic elastomer

Agglomerate

Ethylene propylene rubber

10.1021/sc500391g

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Citations (117)

Effects of Heat and Pressure on Microstructures of Isobutylene‐Isoprene Rubber (IIR)/Clay Nanocomposites

Macromolecular Materials and Engineering (2005)

Yonglai Lu Yurong Liang Youping Wu Liqun Zhang

Abstract Summary: In this work, the effects of heat and pressure on microstructures of isobutylene‐isoprene rubber/clay nanocomposites prepared by solution intercalation (S‐IIRCNs) are investigated. Not only are the local intercalated structures monitored by wide‐angle X‐ray diffraction, but the spatial distributions of the silicate particles are also observed by transmission electron microscopy. The changing behavior of microstructures of S‐IIRCNs is strongly dependent on the temperature of the thermal treatment. The observed phenomena are completely different from those in IIRCNs prepared by melt blending (M‐IIRCNs), which were reported in a previous paper. Various experiments suggest that the presence of residual solvent molecules in S‐IIRCN plays a key role on the microstructural change of S‐IIRCNs caused by heat and pressure. The possible microstructural models for untreated and treated S‐IIRCNs are presented, which could well interpret all observed phenomena. Finally, guidelines are proposed for adjusting the curing conditions of the system to achieve the desired intercalated/exfoliated morphology, and a new method for preparing rubber/clay nanocomposites with good dispersion states by melt blending is put forward. TEM images of IIR/clay nanocomposites prepared by solution‐intercalation before (left) and after thermal treatment at 160 °C and atmospheric pressure (right). magnified image TEM images of IIR/clay nanocomposites prepared by solution‐intercalation before (left) and after thermal treatment at 160 °C and atmospheric pressure (right).

Isobutylene

Isoprene

10.1002/mame.200500319

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Citations (26)

Properties Prediction and Design of Tire Tread Composites Using Machine Learning

Macromolecular Theory and Simulations (2020)

Song Pang Jinlian Luo Youping Wu

Abstract The present study focuses on exploring the relationship between various properties of tire tread composites and filler system using machine learning. Four different types of machine learning algorithms, such as multiple linear regression (MLR), artificial neural network (ANN), support vector machine regression (SVR), and classification and regression tree, are used for predicting 0 °C tanδ, 60 °C tanδ, tensile strength, and Shore A hardness of natural rubber nanocomposites from carbon nanotubes dosage, silica dosage, and total filler equivalent. The results showed that the introduction of interaction terms and square terms into the inputs evidently improved the prediction capability of MLR, ANN and SVR, and MLR possessed the smallest prediction errors (<5%). The established MLR models are further used to design tire tread composites with high 0 °C tanδ, low 60 °C tanδ, and appropriate Shore A hardness and tensile strength. The predicted values are in good agreement with the experimental results, indicating that the established MLR models can be used for properties prediction and design of tire tread composites effectively. Moreover, k‐fold cross‐validation is proved to be a reliable technique to evaluate the predictive capability of the MLR models.

Shore durometer

Filler (materials)

Tear resistance

10.1002/mats.201900063

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Citations (3)

Prediction of the stress relaxation property of diene rubber composites by artificial neural network approaches

RSC Advances (2015)

Xiujuan Wang Youping Wu Qiangguo Li Tung W. Chan Liqun Zhang

An artificial neural network was established to predict the stress relaxation property of diene rubber composites during ozone aging.

Diene

Stress relaxation

10.1039/c5ra10485h

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Citations (13)

Organic interfacial tailoring of styrene butadiene rubber–clay nanocomposites prepared by latex compounding method

Journal of Applied Polymer Science (2006)

Qingxiu Jia Youping Wu Yiqing Wang Ming Lü Jian Yang

Abstract The styrene butadiene rubber (SBR)–clay nanocompounds were prepared by the latex compounding method, and then hexadecyl trimethyl ammonium bromide (C16) and 3‐aminopropyl triethoxy silane (KH550) were added into these nanocompounds on a two‐roll mill to prepare nanocomposites with strong interfacial interaction. The structure and properties of SBR–clay nanocomposites were carefully studied by X‐ray diffraction (XRD) studies, transmission electron microscopy (TEM), Rubber Process Analyzer (RPA), and mechanical testing. Compared with unmodified nanocomposites, the dispersion structure of modified SBR–clay nanocomposites is better with part rubber‐intercalated or part modifier‐intercalated structure. The tensile strength and the modulus at 300% elongation of modified SBR–clay nanocomposites are higher than three times of those of unmodified nanocomposites, respectively. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1826–1833, 2007

Compounding

Styrene-butadiene

Tear resistance

Ammonium bromide

10.1002/app.25299

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Citations (45)

Interfacial crystallization and its mechanism in in-situ dynamically vulcanized iPP/POE blends

Polymer (2014)

Ming Tian Ting Li Liqun Zhang Hongchi Tian Youping Wu

Tacticity

Thermoplastic elastomer

Polypropylene

10.1016/j.polymer.2014.05.019

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Citations (18)

Preparation, structure, and properties of a novel rectorite/styrene–butadiene copolymer nanocomposite

Journal of Applied Polymer Science (2005)

Yiqing Wang Huifeng Zhang Youping Wu Jun Yang Liqun Zhang

Abstract Rectorite/styrene–butadiene copolymer (SBR) nanocomposite was prepared by cocoagulating SBR latex and rectorite/water suspension. Transmission electron microscopy showed that the layers of rectorite were well dispersed in the SBR matrix and the aspect ratio (width/thickness) of it was higher than that of montmorillonite (MMT). X‐ray diffraction indicated that the nanocomposite produced by this method was of neither intercalated type nor exfoliated type. The gas barrier properties and mechanical properties of the novel nanocomposites were excellent. The nanocomposites are expected to be candidates for tire tube or inner materials. Rectorite appears to be a promising filler for the nanocomposite. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 324–328, 2005

Styrene-butadiene

Suspension

10.1002/app.21409

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Citations (59)

Molecular dynamics simulations of the structural, mechanical and visco-elastic properties of polymer nanocomposites filled with grafted nanoparticles

Physical Chemistry Chemical Physics (2015)

Jianxiang Shen Jun Liu Haidong Li Yangyang Gao Xiaolin Li

Through coarse-grained molecular dynamics simulations, we have studied the effects of grafting density (Σ) and grafted chain length (Lg) on the structural, mechanical and visco-elastic properties of end-grafted nanoparticles (NPs) filled polymer nanocomposites (PNCs). It is found that increasing the grafting density and grafted chain length both enhance the brush/matrix interface thickness and improve the dispersion of NPs, but there seems to exist an optimum grafting density, above which the end-grafted NPs tend to aggregate. The uniaxial stress–strain behavior of PNCs is also examined, showing that the tensile stress is more enhanced by increasing Lg compared to increasing Σ. The tensile modulus as a function of the strain is fitted following our previous work (Soft Matter, 2014, 10, 5099), exhibiting a gradually reduced non-linearity with the increase of Σ and Lg. Meanwhile, by imposing a sinusoidal external shear strain, for the first time we probe the effects of Σ and Lg on the visco-elastic properties such as the storage modulus G′, loss modulus G′′ and loss factor tan δ of end-grafted NPs filled PNCs. It is shown that the non-linear relation of G′ and G′′ as a function of shear strain amplitude decreases with the increase of Σ and Lg, which is consistent with experimental observations. We infer that the increased mechanical and reduced non-linear visco-elastic properties are correlated with the enhanced brush/matrix interface and therefore better dispersion of NPs and stronger physical cross-linking. This work may provide some rational means to tune the mechanical and visco-elastic properties of end-grafted NPs filled polymer nanocomposites.

Polymer nanocomposite

Dynamics

10.1039/c4cp05520a

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Citations (72)