Determination of fracture energy of high strength double network hydrogels
Determination of fracture energy of high strength double network hydrogels
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DOI：
10.1021/jp0500790
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发表时间：
2005-06-16
影响因子：
3.3
通讯作者：
Osada, Y
中科院分区：
文献类型：
--
作者：
Tanaka, Y;Kuwabara, R;Osada, Y
本文研究了由聚乙烯和聚乙烯组成的双网络凝胶的断裂能G（2-丙烯酰胺基-2-甲基丙磺酸）（PAMPS）作为第一网络和聚作为第二网络的丙烯酰胺（PAAm）作为裂纹速度V的函数通过撕裂试验测量。（i）断裂能G的范围为10（2）至接近10（3）J/m（2），这比具有与DN凝胶类似的聚合物浓度的正常PAAm凝胶（10 J/m（2））或PAMPS凝胶（10（-1）J/m（2））的断裂能大100-1000倍。(ii)G对裂纹速度V的依赖性很弱。（iii）在给定的V值下，G随第二网络交联密度的减小而增大。G的测量值进行了比较与三个理论，描述不同的机制，提高软聚合物系统的断裂能。与DN凝胶的非均匀结构有关的机制是令人信服的，因为G值显着较大。
The fracture energy G of double network (DN) gels, consisting of poly(2-acrylamido-2-tnethylpropanesulfonic acid) (PAMPS) as the first network and poly(acrylamide) (PAAm) as the second network, was measured by the tearing test as a function of the crack velocity V. The following results were obtained: (i) The fracture energy G ranges from 10(2) to similar to 10(3) J/m(2), which is 100-1000 times larger than that of normal PAAm gels (10 J/m(2)) or PAMPS gels (10(-1) J/m(2)) with similar polymer concentrations to the DN gels. (ii) G shows weak dependence on the crack velocity V. (iii) G at a given value of V increases with decreasing of cross-linking density of the 2nd network. The measured values of G were compared with three theories that describe different mechanisms enhancing the fracture energy of soft polymeric systems. A mechanism relating to a heterogeneous structure of the DN gel is convincing for the remarkable large values of G.