碳材料对海藻酸钠纺丝液降解性的影响

Influence of carbon materials on degradation of sodium alginate spinning solution

研究了炭黑(CB)、活性炭(AC)、氧化石墨烯(GO)和多壁碳纳米管(MWCNTs)等碳材料的加入对海藻酸钠(SA)溶液降解性能的影响,利用GPC和旋转黏度计测定了SA/碳材料复合溶液降解率的变化,并在此基础上研究了SA/碳材料复合溶液的降解动力学。结果表明,各种碳材料的加入对SA的防降解效果依次为GO>CB>AC>MWCNTs,其降解速率常数依次为k SA>k SA/MWCNTs>k SA/AC>k SA/CB>k SA/GO。通过FT-IR、XRD和SEM对SA/碳材料复合溶液防降解效果进行表征,结果表明,碳材料与SA之间并未形成共价键,只有氢键作用。经紫外照射的SA/碳材料复合膜,纯SA膜晶区强度稍有下降,SA/GO晶区的强度明显增强。纯SA膜经紫外照射后出现了裂纹,加入各种碳材料的SA薄膜未发现有裂纹出现。结果表明,利用碳材料对SA进行防降解改性是一种工艺简单,操作快捷的方法。

The study of the influence of carbon black （CB）, activated carbon （AC）, graphene oxide（GO） and multi-walled carbon nanotubes （MWCNTs） on the degradability of sodium alginate solution was carried out, the change of the degradation rate of SA/carbon material mixed solutions was measured by employing GPC and rotation viscometer, and the degradation kinetics of SA/carbon material mixed solutions was discussed. It was found that among these carbon materials, the effect of anti- degradation was GO 〉 CB 〉 AC 〉 MWCNTs. The degradation rate constants was ksA 〉 kSA/MWCNTs〉 ksn/nc 〉 ksA/cB 〉 ksA/Go. Anti-degradation effect of SA/carbon material solutions were characterized by FTIR, XRD and SEM. The results indicated that no new covalent bond formed, but H-bond existed between SA and carbon materials. The crystalline region of SA film after UV irradiation was slightly decreased, but the crystalline region graphene oxide/SA complex film was notably enhanced. The pure SA film exhibited cracking while SA/carbon complex film showed no cracking after UV irradiation. To summarize, carbon materials as anti-degradation agents for SA have advantages of being simple in technology and easy to operate.