Preparation and EMI shielding properties of solid-solid phase change resin composites based on glass fiber fabrics
Electromagnetic interference(EMI)shielding composites with flexible thermal response are one of the ideal candi-date materials for electromagnetic protection,building engineering,and electronic compatibility.In order to prepare this type of EMI shielding composites,firstly,isocyanatopropyltriethoxysilane(IPTS)was reacted with poly(ethylene glycol)(PEG)to obtain a flexi-ble solid-solid phase change resin(SPCR)matrix with highly reactive silanol groups that can produce self crosslinking.Subsequent-ly,AgNWs/GFF/SPCR composites were prepared by SPCR encapsulation of glass fiber fabrics(GFF)decorated by silver nanow-ires(AgNWs).The structure and thermal stability of SPCR were tested,and the influence of number of AgNWs/GFF layers on the electromagnetic shielding performance of the composites was studied.Finally,the thermal response performance of the composite was tested.The results show that the SPCR has an excellent shape stabilization capability to prevent leakage while retaining the orig-inal PEG phase change properties.The EMI shielding effectiveness(SE)of the composites consisting of four layers of AgNWs/GFF is about 73 dB at 2.8 mm thickness.The EMI absorption effectiveness(SEA)shows an increasing trend with the increase of EMI SE,while the EMI reflection effectiveness(SER)fluctuates in the band range of 6 dB to 18 dB.Meanwhile,the reflection coefficient(R)is much larger than the absorption coefficient(A),and the AgNWs/GFF/SPCR composites exhibit an obvious reflection-dominated shielding mechanism.Furthermore,the AgNWs/GFF/SPCR composites exhibit significant temperature hysteresis phenomenon in both warming and cooling processes.Therefore,the AgNWs/GFF/SPCR composites have a broad prospect in electromagnetic radia-tion protection and equipment thermal management.
NETL
NSTL
万方数据
