Preparation of high modulus poly(vinyl alcohol) by drawing

Abstract

SynopsisThe preparation of PVA films and fibers with high modulus and high strength was examined. The high drawing was attained when both the drawing just before melting and the relaxation a t room temperature were repeated. The maximum draw ratio was 40 for the films prepared from the gels of high molecular weight (HMW) a-PVA ( D P = 12000)/water/dimethyl sulfoxide (DMSO) system (water/DMSO = 20/80). The degree of crystallinity of the dried gels prepared from the PVA/ethylene glycol (EG) system was high, 40-50%, and independent on the tacticity of PVA. The modulus of the fibers, prepared from the gels of HMW s-PVA ( D P = 15300)/EG system, drawn 15 times to its original length was the highest ( 120 GPa) .

High-strength, high-modulus fibres made from linear polymers: principles of fabrication, structure, properties, and use

“…In addition to para-aromatic fi bres, polyvinyl alcohol, polyethylene, and some other types of high-strength, highmodulus fi bres have also been developed and manufactured [11,12,[91][92][93][94][95]. Their fundamental properties are reported in Table 8.…”

“…High-strength, high-modulus polyvinyl alcohol (PVA) fi bres are manufactured by two methods [11, [91][92][93][94][95]. 1) Based on PVA with the usual molecular weight (approximately 100,000) and regular structure (with minimum acetate group content).…”

Ultradrawing properties of ultra-high molecular weight polyethylene/hydrochloric acid treated attapulgite fibers

“…[ [36][37][38][39][40]. Its structure scheme was firstly proposed by Bradly in 1940 [37], who described a theoretical formula of (Mg, Al, Fe) 5 Si 8 O 20 (Al)(HO) 2 (OH 2 ) 4 ·4H 2 O.…”

Effects of Stress Level and Temperature on the Time Dependent Morphological and Physical Properties of PVA Fibers

“…The reported tensile properties, however, fall much shorter of theoretically predicted values although various efforts have been made including ultrahigh drawing of gel-spun fiber [8], zone drawing [9,10], multi-step drawing [11], hot drawing [12,13], and cross linking spinning method [14]. Aside from those techniques associated with fiber spinning process, the heat treatment at an appropriate condition is another essential process to maximize the mechanical properties of fibers by reducing or eliminating residual stresses, strains and defects.…”