摘要
将刺云实胶（TG）与魔芋葡甘聚糖（KGM）按不同质量比复配,制得系列复合凝胶TG/KGM（TK0、TK2、TK4、TK6、TK8及TK10）,利用FTIR和SEM对其结构进行了表征,通过旋转流变仪考察了其静态与动态流变性能。结果表明,TG/KGM在高温下为假塑性流体,二者具有良好的相容性,在剪切速率0.01~100 s-1内,随着KGM质量分数由0增加到100%（由TK10到TK0）,复配溶胶体系的剪切应力和黏度均增加。剪切应力由0.00267~2.82 Pa增加至0.753~290 Pa,黏度由0.376~0.0282 Pa·s增加至38.3~1.58 Pa·s。在选定的频率范围（0~955 r/min）内,TG/KGM的损耗模量（G＇）均低于其储能模量（G＇）,G＇和G＇＇都随着频率的增加而增加。在85~25℃的降温过程中,随着KGM的增加,复配体系中G？和G？均下降,且溶胶向凝胶的转化温度下降。当m（TG）∶m（KGM）=0.9∶0.6（TK6）时,可得到综合性能优异、胶凝能力强、稳定性高且黏度适中的凝胶体系。
A series of blend hydrogels（TK0, TK2, TK4, TK6, TK8 and TK10） based on tara gum/konjac glucomannan（TG/KGM） in different proportion were prepared and characterized by FTIR and SEM. The rheological properties of samples were investigated by rotational rheometer. The result revealed that TG/KGM hydrosols behaved like pseudo-plastic fluid at high temperature and had excellent miscibility. In the range of shear rate 0.01~100 s-1, with the mass fraction of KGM increasing from 0 to 100%, the shear stress and viscosity of blend hydrogels（from TK10 to TK0） systems increased. In the selected frequency range of 0~955 r/min, the loss modulus（G？） of TG/KGM was lower than storage modulus G＇, and the G＇and G＇＇ increased with the increase of frequency. However, during the cooling process from 85 to 25 ℃, G＇and G＇＇ moduli declined with the increase of mass fraction of KGM and the conversion temperature of sol to gel gradually decreased. When the mass ratio of TG to KGM was 0.9∶0.6, the TK6 blend hydrogel system exhibited more excellent comprehensive properties, such as higher gelling ability, higher stability and more moderate viscosity.
作者
王晓珊
袁毅
龚静妮
王林
庞杰
WANG Xiao-shan;YUAN Yi;GONG Jing-ni;WANG Lin;PANG Jie(College of Material Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;of Food Science,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第10期1707-1712,共6页
Fine Chemicals
基金
国家自然科学基金(31471704)
福建省自然科学基金(2017J01155,2014J01384)~~
