以4种不同取代度的CMC和SA为原料,采用溶液共混法制备 SA/CMC 复合膜,并通过红外、XRD、SEM及其它化学方法,研究CMC的取代度对其溶解性能、SA 与 CMC 的相容性、以及 SA/CMC 复合膜的红外光谱、结晶结构、透光率、力学性能、阻氧性和水溶性等的影响.结果表明,SA与 CMC之间具有范德华力和氢键等相互作用,4种取代度的CMC与SA均具有良好的相容性.随着CMC取代度的增加,溶液中的未溶解片段逐渐减少,复合膜的截面趋向于光滑、平整,且结晶度和透光率逐渐增加.随着CMC的取代度从0．4提高到0．9,复合膜的断裂强度从6．25 MPa提高到37．27 MPa,水溶时间从162 s 缩短至70 s,而且复合膜的阻氧性能提高,油脂的过氧化值从4．2 g/100 g下降至1．9 g/100 g.
Composite films of sodium alginate (SA)and four types of carbocymethyl cellulose (CMC)with dif-ferent degree of substitution (DS)were prepared by solution blending,and the effect of the DS on structure and properties of SA/CMC composite films was discussed.Van der waals forces and hydrogen bonding force among various functional groups of the component polymers of SA/CMC composite films was confirmed by their infra-red spectra,therefore,these two components of SA/CMC composite films were satisfactory compatibility.As the increase of DS,the mount of undissolved fragments in CMC solution gradually decrease,cross section of SA/CMC composite films tends to smooth and flat,and their crystallinity and transmittance slowly increase. The tensile strength of SA/CMC composite film increases to 37.27 MPa from 6.25 MPa,their dissolving time in distilled water declines to 70 s from 162 s,and peroxide value of oxidated oil reduces to 1.9 g/100 g from 4.2 g/100 g,while the DS of CMC increases to 0.9 from 0.4.
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