研究了不同防老剂对杜仲胶/天然橡胶(EUG/NR)并用胶性能及其热氧老化性能的影响。利用扫描电子显微镜、差示扫描量热仪、热重分析仪、万用拉伸机对并用胶的微观形貌、结晶熔融行为、热稳定性及力学性能进行了测试和表征。结果表明:防老剂的加入有助于并用胶的硫化,能够提高并用胶的力学性能;在热氧老化条件下防老剂4010NA对并用胶的防护效果最佳;并用胶在老化过程中EUG相先发生反应,防老剂4010NA主要延缓并用胶中EUG相交联网络的进一步交联。热重分析表明老化24h后,EUG/NR并用胶的分子主链及交联网络未出现明显的破坏。
The effects of different antioxidants on the thermal oxidative aging properties of eucommia ulmoides gum(EUG)/natural rubber(NR) blends were studied.The microstructure,crystallization and melting behavior,thermal stability and mechanical properties of the blends were tested and characterized by SEM,DSC,TGA and universal drawing machine.The results showed that the addition of antioxidant was helpful to the vulcanization and the mechanical properties of the blends were improved;The antioxidant 4010NA had the best protective effect on the combined glue under the condition of thermal oxidative aging.The EUG phase reacted first in the aging process,and 4010NA mainly delayed the further crosslinking of EUG phase network in blends.Thermogravimetric analysis showed that the main molecular chain and crosslinking network of EUG/NR did not appear obvious damage after 24h aging.
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