Ultradrawing Properties Of Ultra-high Molecular Weight Polyethylene/Modified Attapulgite Fibers

Systemic investigation of the influence of the original and modified nanosilica contents on the ultradrawing properties of ultrahigh molecular weight polyethylene(UHMWPE)/purified ATP(F100Ay)and UHMWPE/acid treated ATP as-prepared fibers are reported.After treating ATP nanofibers in a 4 M sulfuric/phosphoric(1:1)mixed acid solution for 60 minutes,the maximal specific surface areas of the acid treated ATP nanofibers reaches around 258 m/g.After incorporation of purified or acid treated ATP in UHMWPE,the Tm(or 1c)and Xc values of F100Ay,F100(AS2M-30)y,F100(AP5M-60)y,and F100(AS1P1-4M-60)y as-prepared fiber series specimens reduce and increase significantly,respectively,as their purified and/or acid treated ATP contents increase.In which,Tm(or 1c)and Xc values of the F100(AS2M-30)y,F100(APSM-60)y,and F100(ASIPi-4M-60)y as-prepared fiber specimens are significantly lower and higher than those of the corresponding F100Ay as-prepared fiber specimens with the same ATP contents but without treating with sulfuric/phosphoric(1:1)mixed acid solutions,respectively.Moreover,it is worth noting that F100(As2M-30)y,F100(AP5M-60)y,and F100(ASIPI-4M-60)y as-prepared fiber series specimens exhibits the lowest Tm(or 1c)but the highest Xc values with the fixed acid treated ATP contents and the hydrochloric acid concentration increaseing to 4M optimal value.The Dra values of F2Ay as-prepared fiber series specimens increase significantly with the initial increase in purified ATP contents and then reach a maximal value at 137 as their purified ATP contents approach an optimum value at 0.05 phr.After treatment of sulfuric/phosphoric(1:1)mixed acid acid on purified ATP nanofibers,the Dra values of each F2AXM-y as-prepared fiber series specimens are significantly higher than those of the corresponding F100Ay as-prepared fiber specimens with the same purified ATP contents but without acid treatment.Similar to those found for F100Ay as-prepared fiber specimens,the Dra values of each F100(AS1P1-4M-60)y as-prepared fiber series specimens reach a maximal value as their acid treated ATP contents approach a lower optimum value at 0.025 phr.Moreover,it is worth noting that the maximum Dra values of the F100(AS1P1-4M-60)0.05 as-prepared fiber specimens reached another maximum value at 137 as their purified ATP nanofibers were treated by 4M sulfuric/phosphoric(1:1)mixed acid.The fo values of drawn F100Ay and F100(AS1P1-4M-60)y fiber specimens with the same draw ratios reach a maximum value as their purified and acid treated ATP contents approach the optimum values at 0.025 phr,respectively.In which,fo values of drawn F 100(AS1P1-4M-60)y fiber specimens are higher than those of the corresponding F100Ay fiber specimens with the same draw ratios and ATP contents but without treating with sulfuric/phosphoric(1:1)mixed acid solutions.It is worth to note that the fo values of drawn F100(AS1P14M-60)y fiber specimens are higher than those of the corresponding F100(AS1P1-4M-60)y fiber specimens as the sulfuric/phosphoric(1:1)mixed acid treating time approach the optimum value at 60 minutes.Tensile property analysis further suggested that excellent orientation and tensile properties of the drawn F100Ay,F100(AS2M-30)y,F100(AP5M-60)y,and F100(AS1P1-4M-60)y fibers can be obtained by ultradrawing the fibers prepared at their optimum purified ATP and/or acid treated ATP contents.To understand the interesting orientation,ultradrawing and tensile properties of F100Ay,F100(AS2M-30)y,F100(AP5M-60)y,and F100(AS1P1-4M-60)y fiber specimens,elemental and morphological analysis,specific surface areas,FTIR,thermal properties of the as-prepared fibers,orientation factor,achievable draw ratios and tensile properties of the purified and acid treated ATP were performed in this study.