Due to their excellent dielectric properties and the rapid response to microwave irradiation,silicon carbide nanowhiskers(SiCNWs)were employed as microwave susceptor in this study to absorb microwave and locally melt the surrounding polypropylene(PP)substrates for the joining of PP substrates.Complete welded joint is formed after the melted PP was cooled and resolidified.Other than microwave susceptor,SiCNWs also acted as the nanofillers in strengthening the welded joint through the formation of SiCNWs reinforced PP nanocomposite at the interface of PP substrates.Besides,the effect of microwave power on the microwave welding of PP substrates using SiCNWs as susceptor was studied and reported.It was found that the tensile strength and modulus of elasticity of the welded joint improved as microwave power increased.However,it deteriorates the flexibility of the welded joint as high stiffness SiCNWs were incorporated deeper into the PP matrix which restricted the PP chain mobility.Aside from microwave power,clamping pressure is also critical in determining the mechanical properties of a welded joint.When compared to unclamped welded joint,the tensile strength,modulus of elasticity and flexibility of welded joint subjected to clamping pressure improved drastically.Moreover,the tensile strength of welded joint increased when the clamping pressure was increased from P1 to P3,but decreased when the clamping pressure was further increased to P4 due to the occurrence of flashing at welded joint.The formation mechanism of SiCNWs reinforced PP welded joint was also proposed in this study.Compared to conventional welding,this welding process is easy,straightforward and is able to produce welded joint with outstanding mechanical properties via precise controlling of the processing parameters.Thus,microwave welding is thought to offer an option for the joining of thermoplastics and other applications.

Phey Yee Foong;Chun Hong Voon;Bee Ying Lim;Pei Leng Teh;Mohd Afendi Bin Rojan;Nor Azizah Parmin;Subash C.B.Gopinath;Mohd Khairuddin Md Arshad;Foo Wah Low;Savisha Mahalingam;Abreeza Manap;Ruslinda A.Rahim;Uda Hashim

Institute of Nano Electronic Engineering,Universiti Malaysia Perlis,Seriab,Kangar,Perlis 01000,Malaysia;Faculty of Chemical Engineering Technology,Universiti Malaysia Perlis,Jejawi,Perlis Arau 02600,Malaysia;Faculty of Mechanical Engineering Technology,Universiti Malaysia Perlis,Pauh,Perlis Arau 02600,Malaysia;b Faculty of Chemical Engineering Technology,Universiti Malaysia Perlis,Jejawi,Perlis Arau 02600,Malaysia;Department of Electrical & Electronic Engineering,Lee Kong Chian Faculty of Engineering & Science,Universiti Tunku Abdul Rahman,Bandar Sungai Long,Kajang,Selangor 43000,Malaysia;Institute of Sustainable Energy,Universiti Tenaga Nasional,Jalan IKRAM-UNITEN,Kajang,Selangor 43000,Malaysia

高分子科学（英文版）

[1]Phey Yee Foong;Chun Hong Voon;Bee Ying Lim;Pei Leng Teh;Mohd Afendi Bin Rojan;Nor Azizah Parmin;Subash C.B.Gopinath;Mohd Khairuddin Md Arshad;Foo Wah Low;Savisha Mahalingam;Abreeza Manap;Ruslinda A.Rahim;Uda Hashim-.Effect of Microwave Power and Clamping Pressure on the Microwave Welding of Polypropylene Using Silicon Carbide Nanowhiskers as Microwave Susceptor)[J].高分子科学（英文版）,2022(11):1466-1481

Nanowhiskers,Susceptor,nanowhiskers,susceptor,resolidified,unclamped,flashing,thermoplastics

Effect,Microwave,Power,Clamping,Pressure,Welding,Polypropylene,Using,Silicon,Carbide,Due,their,excellent,dielectric,properties,rapid,response,microwave,irradiation,silicon,carbide,SiCNWs,were,employed,this,study,absorb,locally,surrounding,polypropylene,PP,substrates,joining,Complete,welded,joint,formed,after,melted,was,cooled,Other,than,also,acted,nanofillers,strengthening,through,formation,reinforced,nanocomposite,interface,Besides,effect,power,welding,using,studied,reported,It,found,that,tensile,modulus,elasticity,improved,increased,However,deteriorates,flexibility,high,stiffness,incorporated,deeper,into,matrix,which,restricted,chain,mobility,Aside,from,clamping,pressure,critical,determining,mechanical,When,compared,subjected,drastically,Moreover,when,P1,P3,but,decreased,further,P4,due,occurrence,mechanism,proposed,Compared,conventional,easy,straightforward,able,produce,outstanding,via,precise,controlling,processing,parameters,Thus,thought,offer,option,other,applications

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