CAJ | 학술논문

采用流变仪考察了异丙醇对胶原溶液稳态剪切、屈服应力和触变性质的影响。实验表明，在低剪切速率下，异丙醇的浓度对体系的粘度影响较大，在高剪切速率下各体系粘度则对异丙醇浓度不敏感。幂律方程和Carreau方程能很好地拟合胶原／异丙醇共混溶液的流动曲线，通过粘度系数K、非牛顿指数”和零剪切粘度叩。等准确地描述共混溶液的流变性质。通过屈服应力测试发现，异丙醇的加入降低了体系的屈服应力，改善了胶原的流动性质，但同时也使体系不稳定程度增加。另外含有1mol／L异丙醇的共混溶液触变面积小于纯胶原溶液，受剪切破坏的结构能较快速恢复，而含有2和3mol／L异丙醇浓度的共混溶液触变面积大于纯胶原溶液，受剪切而破坏的结构恢复慢，溶液不稳定性增加。
채용류변의고찰료이병순대효원용액은태전절、굴복응력화촉변성질적영향。실험표명，재저전절속솔하，이병순적농도대체계적점도영향교대，재고전절속솔하각체계점도칙대이병순농도불민감。멱률방정화Carreau방정능흔호지의합효원／이병순공혼용액적류동곡선，통과점도계수K、비우돈지수”화령전절점도고。등준학지묘술공혼용액적류변성질。통과굴복응력측시발현，이병순적가입강저료체계적굴복응력，개선료효원적류동성질，단동시야사체계불은정정도증가。령외함유1mol／L이병순적공혼용액촉변면적소우순효원용액，수전절파배적결구능교쾌속회복，이함유2화3mol／L이병순농도적공혼용액촉변면적대우순효원용액，수전절이파배적결구회복만，용액불은정성증가。
The effects of steady flow, yield stress and thixotropic behaviors of collagen on the concentration of 2- propanol were studied by the rheometer. The results showed 2-propanol changed the viscosity of blends with the low shear rate, while, the viscosity of blends was insusceptible to the 2-propanol with the high shear rate. The Power low model and the Carreau model were used to fit the steady flow of the blends, and the parameters obtained from models, such as viscosity coefficient K and non Newton index n, described the rheological behav iors of blends well. The values of the yield stress of blends decreased with adding 2-propanol, suggesting that 2 propanol improved the flow of the collagen solution and the stability of blends decreased. In addition, the thixo- tropic area of the blend with lmol/L 2-propanol was smaller than that of the pure collagen solution, indicating that entangled chain could reverse soon. However, the thixotropic area of the blends with 2 and 3mol/L 2 pro- panol was larger than that of the pure collagen solution, suggesting that reversion ability of the blends de- creased and it was not good for the stability of the blends.