POLYMER PROPERTIES INFLUENCING CURL RETENTION 8(55 -z ,.. -,• . .•?.' ?:: •: .. •-.•.. •:. • •.• :. 5_ .. )5, ........ 2•...:•::u:...:: J::--.. '",•......• ............................ ....... ............. Figure 1. Modified Tenney environmental chamber containing a set of curl swatches
800 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure •. Lucite retention panel The percentage of curl retention was calculated from equation 1. Curl retention (%) - L -- Lt X 100 (1) L -- L0 where: L = length of hair fully extended (25.4 cm) L0 = length of hair before exposure L• --- length of curl after exposure at time (t) Standard statistical methods were used to interpret the significance of all observations. Moisture Transmission (Vapor) The moisture vapor transmission rates (MVTR) of various polymeric substances were determined at 90% relative humidity at 22øC. Films were cast from anhydrous ethanol on super calendered Kraft paper and sealed on MVTR cups containing anhydrous Drierite* to absorb * W. A. Hammond Drierire Co., Xenia, Ohio
Previous Page Next Page 
Purchased for the exclusive use of nofirst nolast (unknown)
From: SCC Media Library & Resource Center (library.scconline.org)