DETERMINATION OF THE ELASTIC-CONSTANTS OF COLLAGEN BY BRILLOUIN LIGHT-SCATTERING
DETERMINATION OF THE ELASTIC-CONSTANTS OF COLLAGEN BY BRILLOUIN LIGHT-SCATTERING
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DOI：
10.1016/0022-2836(79)90339-5
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发表时间：
1979-01-01
影响因子：
5.6
通讯作者：
MILLER, A
中科院分区：
文献类型：
--
作者：
CUSACK, S;MILLER, A
用布里渊(非弹性)光散射法研究了鼠尾肌腱胶原的高频弹性性质。观察到频率约为1010 Hz的纵向和横向极化弹性波以不同角度传播到拉伸的、部分干燥的肌腱的纤维轴上。假定肌腱的弹性性质是横观各向同性的，这些测量可以确定这样一个系统的5个弹性常数。特别是平行于轴线的应变与垂直于轴线的应变的杨氏S模数之比(E.dblvert./E.perp.)为1.43，剪切模数与E.dblvert之比。是0.28。在湿胶原蛋白中，只观察到纵向分支，在这种情况下，E.dblvert./E.perp的比率。增加到1.82。E.dblvert的绝对值。干胶原蛋白为11.9GN·m-2，湿胶原蛋白为5.1GN·m~(-2)。根据胶原蛋白分子组装的预期振动，对这些结果进行了解释。讨论了在测定骨等胶原复合材料的力学性能方面的可能应用，以及对与胶原分子构象不同的纤维蛋白丝素和α-角蛋白和β-角蛋白的测量。
The high-frequency elastic properties of rat-tail tendon collagen were investigated by Brillouin (inelastic) light scattering. Longitudinally and transversely polarized elastic waves of frequency about 1010 Hz were observed propagating at various angles to the fiber axis of stretched, partially dried tendon. Assuming that the elastic properties of tendon are transversely isotropic, these measurements enable the 5 elastic constants for such a system to be determined. In particular the ratio of the Young''s modulus for strain parallel to the axis to that for strain perpendicular to the axis (E.dblvert./E.perp.) is 1.43, and the ratio of the shear modulus to E.dblvert. is 0.28. In wet collagen only the longitudinal branch was observed and in this case the ratio E.dblvert./E.perp. increases to 1.82. The absolute value for E.dblvert. in dry collagen is 11.9 GN m-2 reducing to 5.1 GN m-2 in wet collagen. An interpretation of these results in terms of the expected vibrations of the collagen molecular assembly is given. Possible applications to the determination of the mechanical properties of collagen composite materials such as bone and some measurements on silk and .alpha.- and .beta.-keratins, which are fibrous proteins of different molecular conformation to collagen, are discussed.