Toughness and fracture energy of PDMS bimodal and trimodal networks with widely separated precursor molar masses

被引:59
作者
Genesky, Geoffrey D. [1 ]
Cohen, Claude [1 ]
机构
[1] Cornell Univ, Sch Chem & Biomol Engn, Ithaca, NY 14850 USA
基金
美国国家科学基金会;
关键词
Bimodal networks; Trimodal networks; Enhanced toughness; LINKED POLYDIMETHYLSILOXANE CHAINS; PURE SHEAR DEFORMATION; MULTIPLE-QUANTUM NMR; THRESHOLD FRACTURE; POLY(DIMETHYLSILOXANE) NETWORKS; ELASTOMERIC PROPERTIES; ULTIMATE PROPERTIES; MODEL NETWORKS; SIMULATIONS; STRENGTH;
D O I
10.1016/j.polymer.2010.06.054
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
End-linked PDMS bimodal and trimodal networks display enhanced mechanical properties in uniaxial extension over those of unimodal networks with similar modulus when the molar masses of their precursor chains are widely separated. These multimodal networks have optimal mechanical properties when the short chains are near their overlap concentration and sustain most of the load, but the volume of the system is still dominated by the ductile long chain component. Such elastomers can be stretched to large elongations before fracture while displaying an upturn in stress at high strain. Improvement in fracture energy of pre-cut bimodal and trimodal networks over that of unimodal networks is much less pronounced and appears to be dictated by the average molar mass of the effective elastic strands in each network. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:4152 / 4159
页数:8
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