Superior fatigue and mechanical properties of ethylene-propylene diene monomer rubber incorporated with Zr-based metal-organic framework

被引:6
作者
Abdi, Babak [1 ]
Shojaei, Akbar [1 ]
Molavi, Hossein [1 ,2 ]
机构
[1] Sharif Univ Technol, Dept Chem & Petr Engn, POB, Tehran 111559465, Iran
[2] Inst Adv Studies Basic Sci IASBS, Dept Chem, Zanjan 4513766731, Iran
关键词
EPDM rubber; Fatigue; Morphology; Nanocomposite; UiO-66; Vulcanization system; STYRENE-BUTADIENE RUBBER; CARBON NANOTUBES; NETWORK STRUCTURE; CROSS-LINKING; VULCANIZATION KINETICS; CURING CHARACTERISTICS; PHYSICAL-PROPERTIES; SWELLING BEHAVIOR; REINFORCEMENT; EPDM;
D O I
10.1007/s10965-022-03415-6
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This research reports the remarkable effects of Zr-based metal-organic framework, i.e. UiO-66, on cross-linked network structure and mechanical behaviors of ethylene-propylene diene monomer (EPDM) rubber under sulfur vulcanization systems. To this end, EPDM rubber was vulcanized with conventional (CV), semi-efficient (SEV) and efficient (EV) vulcanization systems. In addition, EPDM nanocomposites containing 5 phr UiO-66 with all three vulcanization systems were also prepared, for the sake of comparison with their corresponding unfilled samples. While the unfilled EPDM vulcanizates showed expectable behaviors in cross-linking density estimated by swelling experiment and cure-rheometer parameters based on their sulfur content and accelerator/sulfur ratio in each vulcanization system, CV cured EPDM/UiO-66 nanocomposite exhibited completely distinctive characteristics. The special swelling behavior plus exclusive cure kinetics supported by dynamic mechanical analysis led us to postulate a distinctive bimodal cross-linked network morphology including a highly cross-linked rubber shell around UiO-66 along with a lightly cross-linked rubber matrix for CV cured system. This special morphology was attributed to higher sulfur content of CV system which was supposed to be adsorbed by UiO-66 due to its tendency toward sulfur and sulfur containing chemicals. Superior tensile and fatigue properties of CV cured EPDM/UiO-66 were also explained by such morphological model.
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页数:17
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