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The 4th Pacific Rim Conference on Rheology

作者： Qing Chen Yu-run Fan and Qiang ZhengState Key Laboratory of Fluid Power Control and Transmission Zhejiang University 310027 Hangzhou China Department of Polymer Science and Engineering Zhejiang University 310027 Hangzhou China

＜正＞ It is well known that shearing has a great impact on the crystallization of polymers. Theoretical models of flow induced polymer crystallization indicated the excessive free energy due to shearing as the major factor that determines the crystallization rate. In this study, relaxation behavior and isothermal crystallization of two commercial high-density polyethylenes （HDPE） were investigated using a rotational rheometer with cone-plate configuration. The excessive free energy is estimated by the measured shear stress and the first normal stress difference, based on a model proposed by Marrucci, in which the molecular orientation brought about by shearing is responsible for the increase of free energy. The results show that a small change of free energy can significantly increase the crystallization rate, thus the induction time of crystallization decreases rapidly as the shear rate increases. The excessive free energy and the induction time of isothermal crystallization can be correlated by an exponential function.

关键词： High-density polyethylene isothermal crystallization shear-induced relaxation behavior.

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An Effective Approach for the Preparation of High Performance Thermal Conductive Polymer Composites Containing Liquid Metal

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Chinese Journal of Polymer Science 2024年第7期42卷 992-1001,I0010页

作者： Xin Chen Xue-Zhong Zhang Yi-Fei Yuan Chuan-Liang Chen Lian-Hu Xiong Qiang Fu Hua Deng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu610065China Department of Materials Science and Engineering Sichuan University-Pittsburgh InstituteSichuan UniversityChengdu610065China

The preparation of high-performance thermal conductive composites containing liquid metals(LM)has attracted significant ***,the stable dispersion of LM within polymer solution and effective property contribution of liquid metals remains significant challenges that need to be *** by the properties of the dendritic structure of the tree root system in grasping the soil,“shear-induced precipitation-interfacial reset-reprotonation”processing strategy is proposed to prepare nanocomposites based on aramid micron fibers(AMFs)with hierarchical dendritic *** to the combination of van der Waals force provided by hierarchical dendritic structure,electrostatic interaction between AMFs and LM,coordinative bonding of―NH to LM,together with interfacial re-setting and multi-step protonation,several features can be achieved through such strategy:conducive to the local filler network construction,improvement of interfacial interaction,improvement of the stability of filler dispersion in the solvent,and enhancement of mechanical and thermal properties of the *** resulting AMFsp H=4/LM films demonstrate a thermal conductivity of 10.98 W·m^(-1)·K^(-1)at 70%filler content,improvement of 126.8%compared to ANFs/LM film;while maintaining a strength of~85.88 MPa,improvement of 77%compared to AMFs/LM *** also possess insulation properties,enable heat dissipation for high power *** work provides an effective strategy for the preparation of high performance polymer composites containing liquid metal.

关键词： shear-induced Reprotonation AMFs LM Filler dispersion

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Better Choice:Linear Long Chains Rather than Branched Ones to Improve Mechanical Performance of Polyethylene through Generating Shish-Kebabs

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Chinese Journal of Polymer Science 2020年第7期38卷 715-729,I0006页

作者： Lu-Feng Deng Xi-Xi Zhang Dong Zhou Jian-Hua Tang Jun Lei Jun-Fang Li Zhong-Ming Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China College of Chemical Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

We utilized two structurally different long chains(linear and branched ultra-high molecular weight polyethylene)to reveal the dependence of flow-induced crystallization on long chain architecture,and prepared two bi-disperse systems of 98 wt%short chain and 2 wt%long chain.A flow field was applied to the bi-disperse polyethylene melt by a modified injection-molding machine,known as oscillation shear injection molding(OSIM).For the first time,the structural influence of long chains on flow-induced shish-kebab formation was systematically *** the intermediate layer of OSIM samples,the branched long chains were better than the linear long chains at inducing shish-kebab formation,agreeing with the reported literatures,because the branches can maintain their oriented conformations *** unexpectedly,the reverse is the case for the core layer of OSIM samples,where the shear flow was much weaker than the intermediate *** understand the unexpected phenomenon,the lifetime of shishes induced by different long chains was *** demonstrated that the linear-induced shishes possessed higher thermal stability than the branched-induced ones so that the linear-induced shishes could survive in the core layer of OSIM ***,unlike other methods for flow-induced crystallization,OSIM could create samples for measuring mechanical properties,and thus offer the chance to reveal the relationship between structure and *** mechanical results demonstrated that both long chains remarkably enhanced the mechanical properties because of the significant promoting effect of long chains and intense flow fields on shish-kebab ***,the linear long chains induced more stable and flawless shishes with higher tensile strength and modulus(80.4 and 1613.5 Mpa,respectively)than the branched ones(74.4 and 1489.3 Mpa).Our research not only helps elucidate the mechanism of shish-kebab formation but also provides a better choice to reinforce

关键词： Polyethylene Crystallization shear-induced Long chain Short chain

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The antithrombotic activity of mini-type tomatoes is dependent on the particular variety and the stage of harvest. Lycopene content does not contribute to antithrombotic activity

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Health 2013年第4期5卷 681-686页

作者： Junichiro Yamamoto Hiroyo Ohno Kanae Hyodo Masahiko Onishi John C. Giddings Cal-Farm Kobe Japan Cardiff University Cardiff UK Laboratory of Physiology Faculty of Nutrition Kobe Gakuin University Kobe Japan

The prevention of arterial thrombotic disease has a high priority in developed countries. We have focused our studies on the antithrombotic activity of those fruits and vegetables with the potential to prevent the disease, and the present study was undertaken as part of a series of investigations to examine beneficial fruits and vegetables. For this purpose, suitable laboratory tests as well as diets have been devised. In the current investigation, we have classified various tomato varieties with antithrombotic properties, and we now have extended our overall data to include more than ten antithrombotic varieties of fruits and vegetables. A method designed to measure shear-induced platelet activity (the Global Thrombosis Test, GTT) was used to assess haemostasis in vitro and a He-Ne laser-induced thrombosis technique was utilized to examine arterial thrombogenesis in vivo. Concentrations of the antioxidant, lycopene, were also measured. Three mini-type tomato varieties, coded “Cin”, “Pik” and “Caec”, and one mediumtype variety, coded “K”, were harvested at different stages of maturity. All mini-type varieties demonstrated antithrombotic activity at an early (green) stage. The antithrombotic activity decreased with the maturation of “Cin” and “Caec” but remained constant at all stages of maturity with “Pik”. The medium variety, “K”, did not possess antithrombotic activity. Lycopene was not detected at any stage in any of the tomato varieties, suggesting that this antioxidant did not contribute to antithrombotic activity. The present results indicated that the antithrombotic activity of tomatoes is dependent on the particular variety and stage of maturity, and that this activity is not due to lycopene.

关键词： Tomato Lycopene Global Thrombosis Test (GTT) shear-induced Platelet Aggregation

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Antithrombotic Effects of Different Strains of Lactic Acid Bacteria

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Health 2014年第18期6卷 2433-2443页

作者： Hiromasa Ooe Masaru Kato Kanae Hyodo Keiko Nakashima Hiroshi Ashigai Kyoko Kato Toshinori Sasaki Yuko Fukushima John C. Giddings Junichiro Yamamoto Research Laboratories for Health Science and Food Technologies Kirin Company Limited Yokohama Japan Research Laboratories for Brewing Technologies Kirin Company Limited Yokohama Japan Laboratory of Physiology Faculty of Nutrition Kobe Gakuin University Kobe Japan Central Laboratories for Key Technologies Kirin Company Limited Yokohama Japan Formerly Department of Haematology School of Medicine Cardiff University UK

Objective: The aim of the present study was to assess the antithrombotic properties of different strains of orally available antithrombotic lactic acid bacteria (LAB). Research Methods & Procedures: Antithrombotic activity, antiplatelet reactivity and/or thrombolytic activity, were measured in seven strains of LAB and LAB cell-free-extracts (LAB filtrates) using the shear-induced platelet reactivity/thrombolytic activity, The Global Thrombosis Test (GTT), with non-anticoagulated rat blood in vitro. Subsequently, the most potent antithrombotic strains identified in vitro were assessed in vivo after oral administration in mouse carotid arteries using a helium-neon laser-induced thrombosis model. Result: Five strains out of seven LAB (Lactobacillus paracasei KW 3100, Lactobacillus fermentum NBRC 3961, Lactobacillus pentosus JCM 8333, Leuconostoc oeni Elios 1, Pediococcus pentosaceus NK-2) promoted significant endogenous thrombolysis in vitro. In addition, one strain (Lactobacillus fermentum NBRC 3961) significantly inhibited shear-induced platelet re-activity. Three antithrombotic strains, Lactobacillus fermentum NBRC 3961, Leuconostoc oeni Elios 1, and Lactobacillus pentosus JCM 8333, were further assessed in vivo. The results demonstrated that filtrates, and the cells per se of these LAB, modulated antiplatelet activity and/or thrombolytic activity, and that the antithrombotic mechanisms were mainly influenced by protein content (60% - 70% of dry matter). Conclusion: The findings suggested that some strains of lactic acid bacteria could usefully provide the basis for the production of oral antithrombotic probiotics.

关键词： Antithrombotic Lactic Acid Bacteria shear-induced Thrombosis Global Thrombosis Test (GTT) Laser-induced Thrombosis Endogenous Thrombolysis

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