Evaluation of Topological Defects in Tetra-PEG Gels

被引：114
|
作者：
Akagi, Yuki [1 ]
Matsunaga, Takuro [2 ]
Shibayama, Mitsuhiro [2 ]
Chung, Ung-il [1 ]
Sakai, Takamasa [1 ]
机构：
[1] Univ Tokyo, Sch Engn, Dept Bioengn, Bunkyo Ku, Tokyo 1138656, Japan
[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
来源：
MACROMOLECULES | 2010年 / 43卷 / 01期
关键词：
ANGLE NEUTRON-SCATTERING; ACTIVE NETWORK CHAINS; ELASTIC-MODULUS; POLY(DIMETHYLSILOXANE) NETWORKS; MECHANICAL-PROPERTIES; POLYMER GELS; SWOLLEN; EQUILIBRIUM; CYCLIZATION; HYDROGEL;
D O I：
10.1021/ma9019009
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We have investigated the topological defects in the Tetra-PEG gel formed from two symmetrical tetra-arm polymers. The concentration of the elastically effective chains (EEC) was estimated from the elastic moduli and the reaction efficiency Using the tree-like Miller-Macosko model. The concentration of EEC was in the range between the estimations of the affine and phantom theory. Furthermore, the formation of topological defects. especially entanglements and loops, was found to be negligible inthe Tetra-PEG gel, which differs from other conventional model networks. This extremely homogeneous Structure Was formed due to the unique impenetrable sphere-like behavior of the tetra-m-in star polymer in the semidilute Solution and the Unique symmetrical A-B type cross-end-coupling.
引用
收藏
页码：488 / 493
页数：6
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