and phenol, in the proportion of : , are reacted under acidic conditions, a resin (often known as a novalac resin) is produced, where n = to . with higher proportions of methanal and with the -position vacant, branching is possible, the methanal providing additional -ch - links. on heating a resin is...
the total imports. major import products are petroleum oils, etc, (excl. crude)/ preparations thereof, nes with an import value of us $ billion . motor cars and other motor vehicles principally designed passengers with an import value of us $ million . other knitted or crocheted fabrics with an import...
the polymer chains. uses of polyesters polyesters are extremely important polymers. their most familiar applications are in clothing, food packaging and plastic water and carbonated soft drinks bottles. the most used of the polyesters has the formula: being an ester, it is made from an acid, benzene...