part of cellulose in polymorph i form is entirely converted to polymorph iii and does not alter the cellulose ii polymorph which is present in cottons pretreated with 23 aqueous naoh conventionally mercerized cotton cellulose iii polymorph can also be completely converted to cellulose iv polymorph by first immersing cellulose iii in ethylenediamine and then in dimethylformamide at its boiling point the nature of the product can be verified via x ray diffractograms in which 20 gives interplaner distances data in table i show 20 diffractometer angles for polymorphs i ii iii and iv of cellulose the following examples serve to illustrate the preferred embodiments but are not intended to limit the scope of the invention native cotton fabric cellulose i was immersed in a small amount sufficient to cover fabric of liquid nh 3 evaporated in a parr bomb at ambient temperature until the pressure within the bomb registered approximately 100 psi 690 kpa samples could be left in the bomb after pressure stabilized for periods varying from short time intervals 30 min to 16 hours at 25 u00b0 c pressure could be released either into a vacuum at 25 u00b0 c sample 6 table ii or into ambient room conditions fabric could also be freed of nh 3 by drying at high temperatures 140 u00b0 c sample 7.