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The process of dissolution of calcium chloride micro-crystalline structure of silk


The role of calcium in the salt solution after the trend and produced changes of the same. That is, with the further deepening solution treatment, the crystallinity decreases, part of the transformation of amorphous crystalline region area, making the non-crystalline content increased. The same effect can be seen that the control in 25 minutes or less, the crystallinity changed little after 25 minutes dissolved the crystallinity decrease significantly. From acid hydrolysis and enzymatic method for the determination that the results shows that dissolution of binary system 5min 70 ~ C are slightly increased when the degree of crystallinity, the binary system,[link widoczny dla zalogowanych], the dissolution of the silkworm system weaker than the ternary system, the dissolved early,[link widoczny dla zalogowanych], non-crystalline regions may be due to fiber swelling occurs first, only a small amount of dissolution, the infiltration of small crystalline regions sake. 3.2 Determination of the density gradient crystallinity of silk fibroin calibration tube in Figure 1 is the density of the standard small ball - height curve, the correlation coefficient r: 0.9989, at the significance level a = 0.001 state, ro. 00l: 0.99116, r> ro. 00l,[link widoczny dla zalogowanych], therefore, the density curve has a highly significant correlation between height, indicating that this experiment has good accuracy and reliability. Table 2 Determination of the density gradient 70 �� for silk binary system of polymer crystallinity has a crystalline phase and amorphous phase coexist in the structure of the state, can be assumed that the specific volume of silk (the reciprocal of density) is a non-crystalline phase Figure 1 l of a leech Qin standard density gradient tube density of the ball. Height curve 1.3851.380 potato I. The amount of 1-37o 375 Figure 2 silk daisy 1.365l36o1_335 binary system treated by the density gradient method in Figure 3 binary system measured the crystallinity of silk processing phase content compared to the linear sum of the two l6J. Japanese silk expert level with reference to Lin Jie reported in the literature, the whole density of the crystalline fibroin take 1.476g/cm3, no amorphous density pa fibroin as 1.306g/cm3. The density of silk fiber internal structure to reflect a feature of index. A certain kind of fiber, the density of the smaller, the lower the crystallinity of fiber. As can be seen from Table 2, the role of silk by calcium chloride after the density decreases, the crystallinity decreased. And with the dissolution time, had a decreasing trend. This is the result of the previous two methods compared to the same variation. And from Figure 2,[link widoczny dla zalogowanych], Figure 3, No. 1 2O04 Jiang good to see that after 20 minutes on the density and decrease the crystallinity started soaring. The density of silk also reflects the internal structure of the relaxation state. Density,[link widoczny dla zalogowanych], relaxation of the internal structure of fibers. Transformation rule from the density gradient term, after solution treated silk fiber produced points, breaking its internal structure gradually becomes loose. Because the silk in the process of dissolution, not only has its place of non-crystalline part of the solution, solvent molecules penetrate into the silk while the crystallization zone, so that part of the transformation of amorphous crystalline region area, the acid hydrolysis and enzymatic determination of crystallinity The results can be informed of this, which is part of the tightly ordered crystalline structure that is transformed into a loose structure that is disordered non-crystalline region, so the role of silk by the calcium chloride solution, then, the internal structure becomes loose, This can also prove that the initial dissolved silk micro-modulus decreased l7 ��. 4 Conclusion (1) In this paper, acid hydrolysis, enzymatic determination of dissolved silk micro-crystalline structure of the process of change, the results show that the crystallinity decreased, increased levels of non-crystalline region. (2) silk micro-neutral solution of calcium chloride solution within 25 minutes, aggregation structure is not fundamentally changed, dissolved after 25 minutes, decrease the crystallinity increased, increased damage on the structure of silk. This modification of calcium solution on the silk provides a theoretical basis.
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