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Citation: QIAN Hong-Lian, WANG Ping-Yue, CHEN Ying. Effects of Aging on Molecular Structure and Properties of Epoxidized Natural Rubber[J]. Chinese Journal of Applied Chemistry, ;2005, 22(10): 1152-1154. shu

Effects of Aging on Molecular Structure and Properties of Epoxidized Natural Rubber

1.
Agriculture Ministry Key Laboratory of Natural Rubber Processing, Agriculture Product Processing Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001

Corresponding author: QIAN Hong-Lian,
Received Date: 29 December 2004
Available Online: 15 April 2005
Fund Project: 中国热带农业科学院科技基金项目(RKY0433) (RKY0433)

The molecular structures,molecular weights,viscocities and moduli of thermal aged and thermal oxidative aged epoxidized natural rubber(ENR) were determined by means of FTIR,GPC and RPA.It was found that the decrease in the IR absorption intensity of the epoxy was more obvious than that of the C=C bond,and the molecular weight and the dynamic rheological behavior had changed.M_n and M_w were reduced respectively by 26% and 5% after thermal oxidative aging.After thermal aging,however,M_n was reduced by 2% only,and M_w increased by 6%.The molecular weight distribution broadened from 3.18 for ENR to 3.43 for the thermal aged ENR and 4.05 for the thermal oxidative aged ENR.The decrement of η^* of the thermal aged ENR with rising shear rate was larger than that of the unaged ENR,but for the thermal oxidative ENR the decrement of η^* was lower compared with the unaged ENR.G' of the thermal aged ENR decreased slightly and G' of the thermal oxidative aged ENR was obvious lower than that of the unaged ENR in the low frequency range.In the high frequency range,G' of the thermal aged ENR was larger than that of the unaged ENR,and G' of the thermal oxidative ENR increased to the same level as that of the unaged ENR.
- epoxidized natural rubber,
- aging,
- structure,
- molecular weight,
- property
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