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A Theoretical Study on Transitional Shear Flow Behavior of the Compressible and Isothermal thermoplastic Polymer

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Chinese Journal of Polymer Science 2019年第5期37卷 518-526页

作者： Dong-Lei Liu Feng Zhou Kun Fang College of Mechanical and Electrical Engineering Nanchang University Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province Nanchang University

By extending the virtual conformational element of the polymer chain, a dynamic end-to-end(ETE) vector was presented to describe the chain's instantaneous morphology based on the spring-bead theory. A feasible viscoelastic model was proposed to describe the rheological behavior of the isothermal thermoplastic polymer materials, based on the molecular kinetics, thermodynamics, and continuum mechanics method. The model is simplified as the generalized Newton's law. Its integral formula with similar form to the KBKZ model was also derived. Rheological experiments were carried out with the isotactic polypropylene material. The experimental results reveal that the viscoelastic model exhibits a three-stage rheological characteristic. There is a distinct high-elastic rheological region in the middle stage, reflecting the pseudoplastic fluids properties. Compared with the Ostwald-de Waele power law model, the viscoelastic model shows a better agreement with the rheological practices.

关键词： Shear flow Theoretical model thermoplastic polymer Rheological experiments

Resistance welding of glass fiber reinforced thermoplastic composite:Experimental investigation and process parameter optimization

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Chinese Journal of Aeronautics 2020年第12期33卷 3469-3478页

作者： Bing DU Liming CHEN Houchang LIU Qinghao HE Weiming QIN Weiguo LI College of Aerospace Engineering Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Heterogeneous Material Mechanics Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Nano–Micro Composite Materials and Devices School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing 401331China Centre for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia

The utilization of fiber reinforced thermoplastics(FRTP)is expected to fulfill lightweight demand in mass-produced aerospace *** the unavoidable assembly of FRTP parts,fusion bonding methods such as resistance welding are promising compared with mechanical joint and adhesive *** this paper,a procedure has been brought out to understand the relationship between processing conditions and performance of the FRTP welding *** adherends were continuous glass fiber reinforced polypropylene(GF/PP)laminates fabricated by hotpressing *** influences of time,current and pressure on the bending strength of the resistance welding joints were investigated.A processing window was drawn based on the optical observation of welded *** quantitative relationship between process parameters and mechanical property of GF/PP welding joint was established by Response Surface Method(RSM)with high *** was found that bending strength of GF/PP welding joint was improved by 31%compared with hot-pressing benchmark.

关键词： Mechanical property Processing parameters Resistance welding Response Surface Method thermoplastic

Highly Ordered thermoplastic Polyurethane/Aramid Nanofiber Conductive Foams Modulated by Kevlar Polyanion for Piezoresistive Sensing and Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第6期15卷 335-352页

作者： Kunpeng Qian Jianyu Zhou Miao Miao Hongmin Wu Sineenat Thaiboonrod Jianhui Fang Xin Feng School of Materials Sciences and Engineering Shanghai UniversityShanghai 200444People’s Republic of China Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444People’s Republic of China National Nanotechnology Center(NANOTEC) National Science and Technology Development Agency(NSTDA)Thailand Science ParkPathum Thani 12120Thailand

Highly ordered and uniformly porous structure of conductive foams is a vital issue for various functional purposes such as piezoresistive sensing and electromagnetic interference(EMI) shielding. With the aids of Kevlar polyanionic chains, thermoplastic polyurethane(TPU) foams reinforced by aramid nanofibers(ANF) with adjustable pore-size distribution were successfully obtained via a nonsolvent-induced phase separation. In this regard, the most outstanding result is the in situ formation of ANF in TPU foams after protonation of Kevlar polyanion during the NIPS process. Furthermore, in situ growth of copper nanoparticles(Cu NPs) on TPU/ANF foams was performed according to the electroless deposition by using the tiny amount of pre-blended Ti_(3)C_(2)T_(x) MXene as reducing agents. Particularly, the existence of Cu NPs layers significantly promoted the storage modulus in 2,932% increments, and the well-designed TPU/ANF/Ti_(3)C_(2)T_(x) MXene(PAM-Cu) composite foams showed distinguished compressive cycle stability. Taking virtues of the highly ordered and elastic porous architectures, the PAM-Cu foams were utilized as piezoresistive sensor exhibiting board compressive interval of 0–344.5 kPa(50% strain) with good sensitivity at 0.46 kPa^(-1). Meanwhile,the PAM-Cu foams displayed remarkable EMI shielding effectiveness at 79.09 dB in X band. This work provides an ideal strategy to fabricate highly ordered TPU foams with outstanding elastic recovery and excellent EMI shielding performance, which can be used as a promising candidate in integration of satisfactory piezoresistive sensor and EMI shielding applications for human–machine interfaces.

关键词： Highly ordered conductive foams MXene Nanofiber thermoplastic Kevlar polyanion Piezoresistive sensing Electromagnetic interference shielding

Effect of microwave treatment on tensile properties of sugar palm fibre reinforced thermoplastic polyurethane composites

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Defence Technology（防务技术） 2018年第4期14卷 287-290页

作者： A.A.Mohammed D.Bachtiar M.R.M.Rejab J.P.Siregar Structural Materials and Degradation Focus Group Faculty of Mechanical EngineeringUniversity of Malaysia Pahang Materials Engineering Department University of TechnologyBaghdadIraq

The effect of microwave treatment on the tensile properties of treated sugar palm fibre with 6% NaOH reinforced thermoplastic polyurethane composites was investigated. Firstly, the sugar palm fibres were treated by 6% alkali solution. Then, microwave treatment was used to treat the alkali treated sugar palm fibres. Three types of temperatures(i.e. 70, 80 and 90℃) were applied in microwave treatment. The extruder and hot press machines were used to mixing the sugar palm fibres and polyurethane resin, and fabricate the composites. Tensile properties(i.e. tensile strength, tensile modulus and elongation at break) were studied by following the ASTM D-638 standard. The highest tensile strength was recorded 18.42 MPa with microwave temperature at 70℃ and 6% alkali pre-treatment. Therefore, the temperature 70℃ of microwave treatment may consider the best degree cent grate.

关键词： Tensile properties Sugar palm fibre thermoplastic polyurethane Alkali treatment Microwave method

Physical and damping properties of kenaf fibre filled natural rubber/thermoplastic polyurethane composites

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Defence Technology（防务技术） 2020年第1期16卷 29-34页

作者： A.M.Noor Azammi S.M.Sapuan Mohamad R.Ishak Mohamed T.H.Sultan Advanced Engineering Materials and Composite Research Centre(AEMC) Department of Mechanical and Manufacturing EngineeringUniversity Putra Malaysia43400UPM SerdangSelangorMalaysia Automotive Engineering Technology Section Universiti Kuala Lumpur Malaysian France Institute(UniKL-MFI)43650Bandar BaruBangiSelangorMalaysia Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400UPM SerdangSelangorMalaysia Department of Aerospace Engineering Universiti Putra Malaysia43400UPM SerdangSelangorMalaysia

The paper presents the investigation of the effect of alkaline treatment of sodium hydroxide(NaOH) on physical and dynamic mechanical analysis(DMA) viscoelastic properties of kenaf fibre filled natural rubber(NR)/thermoplastic polyurethane(TPU) *** treated kenaf fiber,NR and TPU were weighed and proportioned according to the required compositions and were blended using hot mixed Brabender *** polymer composites were then fabricated using the hot press to form a sample *** sample was cut and prepared and water absorption,density,thickness swelling and DMA tests were *** far as physical properties are concerned,composites with the highest NR amount of shows the best results,which indicates good fiber bonding *** polymer composites with the highest amount of TPU shows the highest damping properties at high temperature.

关键词： Kenaf fiber Alkaline treatment thermoplastic polyurethane Natural rubber Dynamic mechanical analysis

Rational design of biodegradable thermoplastic polyurethanes for tissue repair

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Bioactive Materials 2022年第9期7卷 250-271页

作者： Cancan Xu Yi Hong Department of Bioengineering University of Texas at ArlingtonArlingtonTX76019USA

As a type of elastomeric polymers,non-degradable polyurethanes(PUs)have a long history of being used in clinics,whereas biodegradable PUs have been developed in recent decades,primarily for tissue repair and *** thermoplastic(linear)PUs are soft and elastic polymeric biomaterials with high mechanical strength,which mimics the mechanical properties of soft and elastic ***,biodegradable thermoplastic polyurethanes are promising scaffolding materials for soft and elastic tissue repair and ***,PUs are synthesized by linking three types of changeable blocks:diisocyanates,diols,and chain *** the combination of these three blocks can finely tailor the physio-chemical properties and generate new functional *** PUs have excellent processing flexibilities and can be fabricated into three-dimensional(3D)constructs using conventional and/or advanced technologies,which is a great advantage compared with cross-linked thermoset ***,they can be combined with biomolecules to incorporate desired bioactivities to broaden their biomedical *** this review,we comprehensively summarized the synthesis,structures,and properties of biodegradable thermoplastic PUs,and introduced their multiple applications in tissue repair and regeneration.A whole picture of their design and applications along with discussions and perspectives of future directions would provide theoretical and technical supports to inspire new PU development and novel applications.

关键词： Biodegradable polyurethane thermoplastic Elastic Synthesis Tissue repair

Overview of Jute Fibre as thermoplastic Matrix Polymer Reinforcement

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Journal of Renewable Materials 2024年第3期12卷 457-483页

作者： Tezara Cionita Mohammad Hazim Mohamad Hamdan Januar Parlaungan Siregar Deni Fajar Fitriyana Ramli Junid Wong Ling Shing Jamiluddin Jaafar Agustinus Purna Irawan Teuku Rihayat Rifky Ismail Athanasius Priharyoto Bayuseno Emilianus Jehadus Faculty of Engineering and Quantity Surveying INTI International UniversityNilaiNegeri Sembilan71800Malaysia Technical Department Dyna Forming Engineering Technology(DFETECH)SDN.BHD.SerembanNegeri Sembilan70300Malaysia Faculty of Mechanical and Automotive Engineering Technology UniversitiMalaysia Pahang Al-Sultan Abdullah(UMPSA)PekanPahang26600Malaysia Automotive Engineering Center(AEC) UniversitiMalaysia Pahang Al-Sultan Abdullah(UMPSA)PekanPahang26600Malaysia Department of Mechanical Engineering Universitas Negeri SemarangKampus SekaranGunungpatiSemarang50229Indonesia Faculty of Manufacturing and Mechatronic Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekanPahang26600Malaysia Faculty of Health and Life Sciences INTI International UniversityNilai71800Malaysia Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn MalaysiaParit RajaBatu PahatJohor86400Malaysia Faculty of Engineering Universitas TarumanagaraJakarta Barat11440Indonesia Department of Chemical Engineering Politeknik Negeri LhokseumaweLhokseumawe24301Indonesia Department of Mechanical Engineering Faculty of EngineeringDiponegoro UniversitySemarang50275Indonesia Department of Mathematics Education Universitas Katolik Indonesia Santu Paulus RutengNusa Tenggara Timur8651Indonesia

Recent decades have seen a substantial increase in interest in research on natural fibres that is aligned with sustainable development goals(SDGs).Due to their renewable resources and biodegradability,natural fiberreinforced composites have been investigated as a sustainable alternative to synthetic materials to reduce the usage of hazardous waste and environmental *** the natural fibre,jute fibre obtained from a bast plant has an increasing trend in the application,especially as a reinforcement *** research works have been performed on jute fibre with regard to reinforced thermoset and thermoplastic ***,current demands on sustainable materials have required new developments in thermoplastic *** this paper,the author reviews jute plants as reinforcement materials for thermoplastic matrix *** review provides an overview of the sustainability of jute plants as reinforcement material for thermoplastic matrix *** overview on jute based thermoplastic composites focused on the thermal behavior and mechanical *** from physical,chemical,and mechanical properties,the study also covers the current and perspectives for future research challenges faced by the researchers on jute fibre reinforced thermoplastic composites.

关键词： Jute fibre sustainable development goals(SDGs) natural fibre thermoplastic composite sustainable manufacturing

STRUCTURE-PROPERTY RELATIONSHIP OF thermoplastic ELASTOMERS——BLOCK COPOLYMERS

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Journal of China Textile University(English Edition) 1997年第2期14卷 56-62页

作者：李光 China Textile Univ Shanghai China

Block copolymers are marked by alternation of hard blocks and soft blocks, whereby the hard blocks are believed to form crystalline domains in non-crystalline matrix formed by aggregation of the soft blocks and a fraction of the hard blocks escaping crystallization. On the basis of this two-phase model a number of studies has been made varying the nature and length of hard and soft blocks. After reviewing some papers published in this field, it may be concluded that the system in which properties of thermoplastic elastomers are exhibited can be generally divided into three catalogues, they are polyurethane, polyether-ester, polyesteramide elastomers. Structure-property relationship of these thermoplastic elastomers are given in this paper.

关键词： structure property thermoplastic elastomer block copolymer

BLUE BRITTLENESS EFFECT AND thermoplastic SHEAR INSTABILITY IN METAL MACHINING

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Chinese Science Bulletin 1990年第22期35卷 1926-1929页

作者：王敏杰胡荣生刘培德 Department of Mechanical Engineering Dalian University of Technology Dalian 116023 PRC

The thermoplastic shear instability (adiabatic shearing)is a kind of damage phenomenon of materials occurring widely in the processes of various dynamic plastic deformations. The blue brittleness effect is a strength-... 详细信息

关键词： machining blue brittleness effect thermoplastic shear instability.