Laserfiche WebLink
J <br /> l <br /> f CHEMICAL ATTACK OF CEOTEXTILES <br /> (POLYPROPYLENP <br />' Exerpted from Ailing. at al (1900): <br /> TESTED MATERIALS <br /> ^The rnadarlais used In this work were; <br /> polypropylene Pt: plain weave, 570 9/ms . . . <br /> polypropylene P2: plain weave, 240 9lm2 • . . . <br /> poly"ar- pciyamide weft, plain weave,4W 902 . <br /> polyastar strap: polyester fibers sheathed with PckP nG. <br /> polyethylene grid: : . _ <br /> E <br /> TE=ST SOLUTIONS <br /> '__. In consider Ing the chomlcai eflact of soli an any buried material thefirat Mcet knPOrtsM cattddvratlon'is Its <br /> addky or alkalinity. Surveys undertaken In the UK reveal natural Boll Frith PH vollu"*adandfrtp from 3 to <br /> above 10. . . . As polymers appeart to be affected by inorgWW aokrtlans arty W th aoaramo PH vaduos,a Nghly <br /> add (sufptturlc) solution and a highly allcallne(aaddum Dodd*) so&tticn wwre chasm with PH vskmes of S and 12 <br /> respectively. As wail as inorganic add solution it was car< Ww*d apprapfW*to kWknle an*rgWde add <br /> raprasentative of that tound In a poet'5011. . .P-hydra gbenzalc add wits dumm sino3e k Is the add with the <br /> highest concentrgelan of humic and fulvic adds and is readily* SRW;lo. . . Each solutions and <br /> demineralised water were prepared with and without a$MON PdrcwftKle(()- by er d ferrous hate. <br /> This was done so that iron and csdcium tans which sirs known M curtain d Owmatances to oauso degradation Ct <br /> f <br /> polydef Ines and poiyastars would be Included In the assressmwd. <br /> k <br /> CONCLUSIONS <br /> 'All materials exhibited gond chtarttical realstana*[after 12 months fin]In Wads whale*range of PH far <br /> exceeded those normally present in the sell. . .The polyprapylens m arat'iats showed a sight wdgftt increase in <br /> alkaline solutions at pH 10 and PH 12.3, aaccxa{twdW In one cast oW d fear (at pH 12.3)by*raductlon in <br /> tensile strength. Potpropylana P2 Showed a slgnNic=rtlduetbn In tonsil*s drVh alter immersion In HwWq <br /> (pH 3.0)_ polyester w tslbited a welght loss In twc WkWIna sdudon4 WthmWh tttaMurentant was ooripBoated by <br /> crystal growth, A significant reduction In tenses*strartpth was observed after Irnmetaian at PH 12.85 A smd <br /> weight Increase was noted In the organic add. The PofythYWw geoprid was urvW*cttvd bel immerslort M the <br /> twelve llqulds." <br /> Some Polymer resin suppliers provtdo charnlced mastano*data an their SPOClfla 1120"Ors When exPOSW to <br /> various chemicals. This data is usdul In male general Preliminary Of*rrdlcad cc nPolibAity sysduattibns and <br /> demonstrastes the generally Inatrt nature of these polymers. r <br /> FIEFERENGES: (i 9807 Hoechst AG' (19� 3plral Irtasasrad$ys{terlis <br /> CHEMICAL DEGRADATIC N <br /> CONSIDERATIONS PAQE.OF— <br /> I <br /> s Z0 3!DVd ; ZZT7,E69904 LS".ZT 666TIE0/50 <br />