【正文】 ottcher, J. Sol–Gel Sci. Technol. 2 (2004) 103.15. M. H. Yu, G. T. Gu, W. D. Meng and F. L. Qing,Appl. Surf. Sci. 7 (2007) 3669.16. F. Y. Li, Y. J. Xing and X. Ding, Surf. Coat. Tech.19 (2008) 4721.17. C. X. Wang, M. Li, M. Wu and L. Chen, Surf. Rev.Lett. 6 (2008) 833.18. B. Mahltig, D. Fiedler and H. B168。2, 3, 4, 5, 6, 7: Treated with sol concentrations 50, 60,of fabrics with MPTS mol/L and concentration ofthe sol 100%.70, 80, 90, 100% respectively.the value decreased. In the sol solution, the hydrolyalso improve the tensile strength of the cotton fabric and the higher the concentration of the sol, thegreater the increase in the tensile strength. In otherwords, improving the sol concentration was bene?cialto enhance the crease recovery angle and the tensilestrength.The abrasion resistance experiment results arepresented in Table 2. The silica soltreated samples did not show serious damages after frictionsin 200 cycles in parison with the destruction ofthe sample only treated with BTCA in 127 cycles.That might be because silicon–oxygen–silicon bondof the ?lm formed on the surface was stronger thanthe bonds between or in the macromolecular chains.When the same external force was imparted to theuntreated and treated cotton fabrics, the damage ofthe soltreated cotton fabric might be less severe. Onthe other hand, the abrasion resistance was dependent on the crease recovery angle and the tensilestrength. From the results discussed above, both theenhancement in the crease recovery and the tensilestrength could be obtained by silica sol treatment.Therefore, the improvement in the abrasion resistance was acceptable. In other words, the soltreatedcotton fabrics had better abrasion resistance andthe abrasion resistance improved with increasing solconcentration. The best abrasion resistance propertywas obtained when the sol concentration was 100%.. The pH of the solIn Fig. 5, the crease recovery angle increased whenthe increase in sol pH was from 4 to 6 and from 7to . When the pH was increased from 6 to 7,sis of TEOS was catalyzed with the hydrochloride orthe ammonia. The sol with the pH of 7 was preparedwithout catalyst and the hydrolysis at the same timewas probably not su?cient. The degree of the polymer anchored onto the fabric surface might be lowerand the ?lm could be thinner. When the fabric wasbended for an external force, the capacity of restoring its original shape might be weaker because ofless intermolecular forces and the value of the creaserecovery angle was lower. While the pH of the solwas between 4 and 6, for the existence of H+, afterbeing baked at high temperature, the glycoside bondbetween the adjacent glucose monomers of the cellulosic macromolecular chains would breakup to bringabout the degradation of the cotton ?bers. This wasbound to cause the crease recovery angles and thetensile strengths of the fabrics to decrease. And themore acidic the sol, the greater the extent of degradation of the ?bers and the lower the values of thecrease recovery angle and the tensile strength. Onthe other hand, when alkaline sols were prepared, the?bers swelled and underwent reduced degradations.The forces between and in the macromolecular chainsreceive less negative impacts. In addition, the hydrolysis of TEOS resulted in the nucleophilic attack ofhydroxide ion to the silicon atom in alkaline environment. Higher pH values lead to more hydroxideions and more TEOS were hydrolyzed. The thicker?exible ?lms were formed onto the treated cottonfabrics. Therefore, the values of the crease recoveryangle were enhanced with the increase in the pH ofthe sol in alkaline medium.For the tensile strength, it can be seen in Fig. 6that the value decreased with increasing pH of the solCrease recovery angle/176。 strength loss.1. IntroductionCotton fabrics shrink and wrinkle easily due to theshift and deformation of cellulose macromoleculesafter repeated wet N , N dimethylol4,5dihydroxyethyleneurea (DMDHEU) had beenthe most widely used crosslinking agent in textile industry to provide cotton fabrics in the anticrease ?nishing owing to the ether linkages formedbetween DMDHEU and the cellulose molecules. Thetime desirable mechanical stability properties weregiven and the potential to release formaldehyde,a known human carcinogen, was also ,3Signi?cant decrement but not avoidance in therelease of formaldehyde could be obtained by etherifying DMDHEU or by continuing to treat the?nished fabric with hydrolyzed glycidyloxypropyltrimethoxysilane (GPTMS) Another ?nishing agent, 1, 2, 3, 4butanetetracarboxylic acid(BTCA) catalyzed with sodium hypophosphite(SHP) can provide an alternative possibility forthe formaldehydefree crease resistant –7However, the serious strength loss due to depolymerizations and crosslinkings of the cellulose macromolecules is one reason for its relatively small marketSol–gel technology is a chemical processing basedon hydrolysi