||In this investigation, the electroless Ag polyamide (Nylon) was produced by electroless plating. Nylon must be pretreated (swelling, Iodinate, sensitize, activation) before electroless plating, then electroless silver method was used to plate the silver in the chain or surface of Nylon film. The electromagnetic interference (EMI) shielding effectiveness (SE) of Ag-Nylon composition would achieved by the silver plating of appearance.
In electroless process, pretreatment of Iodinate and swelling were chosen as key point as affections of adhesion between matrix and silver plating. Meanwhile, the influences of electroless method between ultrasonic vibration and magnetic stirring for electromagnetic interference (EMI) shielding effectiveness (SE) were investigated. Additionally, weight analysis of deposition time, surface morphology, adhesion test, thermal properties, elements of plating of polymeric composites were detected by SEM, FE-SEM, DSC, XRD, EDS, EMI measurements, respectively.
The results revealed that different electroless method would obtain different EMI shielding effectiveness. The EMI shielding effectiveness of Ag-Nylon composite would reach about 25~30dB when using electroless method of magnetic stirring, however, the EMI shielding effectiveness of composite would reach 50~55dB when using electroless method of ultrasonic vibration. EDS shows the element analysis of plating was simple Ag that has higher electric conductivity was about 63.01 × 106 S/m.
Adhesion testing and surface morphology of SEM show that pretreatment of Iodinate Nylon would improve adhesion between silver plating and Nylon matrix. Electroless silver process without pretreatment of iodinate, swelling would not obtain better adhesion. SEM analysis shows that stacking silver particles would increase on the surface of Nylon when the deposition time was increased. Agglomeration of silver particles would densely packed with increasing deposition time and the smallest silver particles were observed about 1 to 3μm. DSC and XRD analysis show that Nylon would obtain different crystalline structure after pretreatment of swelling and iodinate. The EMI shielding effectiveness of electroless silver Nylon would increase with increasing the content of KBr, and the highest dB value (55~60dB) would obtain by adding 0.052g of KBr.