Study of polypropylene - hydrous magnesium silicate composite as an electret

Abstract

Polypropykne _ Hydrous Idngnesiunl Silicate (Talc) (PP-Tak) composites wllh different PP and 1'JIc ~omposition ("1%) were prepared b} exlnlsil)ll method. The UV-visihlc uh.,orption 'pectroscopic ant! thermally stimulated dcp0larinllOn current (TSDC) mCJsuremmts were carried out on th" pure PI' and Ilvc different PP-Tnlc compositGs, From the UV-\-j"hlc absorption SlLLJics.tbe handgap 0(-PI' mId 1'1'- Talc ~()mposites were calculated from absorption "ersus photon energy gr'-'ph. rh(, absorpllOn shows presence of defectsi impurities in the materials. TI,e TS[)C ledmique wus used to stud}, the charge storage "nd charge rc1Jxal;On behaviour ill pllTC 1'1' Jnd pr-Talc comp",iICS, The TSDC thermograms show (WO di.,tind nnd wlde pe;lh m [he temperalurc region, 28',-323 alUl 400-4101" The inmrpOfJtlon of Talc In 1'1' shifts bolh th~ peaks tnwards low ternp~rature, The low kmperoture p'~ak in the composite' is due to the exi.<,tenceofT"lc m PI' together with the reSult or some moJ~ of po1;'lllermotIOn, .An anal},is of the depemicncc of total released charge. Q. on polarizing \'oltage, Yp , and 'I ale content (\\1%) show lhat the rel"'-.ation is dlpolar but tilt' polarization is re,lricwd by th~ repul,ioL1 fOl'cebelween [he c~tiC1l10 wnh the inne"sc of laic wnlel1l ("\i'%)in PI', The \'miation of peak current with p"larizing \'oltage. Yp' ,md Talceome.nl (Wl%) arc "I", presented. 'Ihe increa,e "f a~tivation energy with Talc conlent (WI%) also ~upporls the above fact"