Construction of cobalt ion (Ⅱ)-epoxy metal coordination bond and properties of borate ester bond-crosslinked epoxy natural rubber
Using epoxidized natural rubber (ENR) with epoxidation degree of the main chain double bond of 70% and 2,2′-(1,4-phenylene)-bis(4-mercapto-1,3,2-dioxaborolane) as raw materials, borate ester bond-crosslinked ENR vulcanizates were prepared by open-mill blending and hot-press vulcanization, borate est...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of China Synthetic Rubber Industry
2025-06-01
|
| Series: | Hecheng xiangjiao gongye |
| Subjects: | |
| Online Access: | http://hcxjgy.paperopen.com/oa/DArticle.aspx?type=view&id=202503009 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Using epoxidized natural rubber (ENR) with epoxidation degree of the main chain double bond of 70% and 2,2′-(1,4-phenylene)-bis(4-mercapto-1,3,2-dioxaborolane) as raw materials, borate ester bond-crosslinked ENR vulcanizates were prepared by open-mill blending and hot-press vulcanization, borate ester bond-crosslinked ENR with different cobalt ion (Ⅱ)-oxygen metal coordination bond contents were prepared by swelling borate ester bond-crosslinked ENR with cobalt chloride (Ⅱ) tetrahydrofuran solution at different concentrations, and the effect of cobalt ion (Ⅱ)-oxygen metal coordination bond content on mechanical properties, dynamic mechanical properties, reshaping performance and reprocessability of the materials were investigated. The results demonstrated that when the mass concentration of cobalt chloride was 1.3 g/L, tensile strength, elastic modulus, and modulus at 500% of the borate ester bond-crosslinked ENR were 0.8 times, 2.0 times and 0.9 times, respectively, higher than those of the blank sample; at room temperature, the cobalt ion (Ⅱ)-oxygen metal coordination bond acted as physical crosslinking point, increasing the content of constrained chain segments in the network and significantly inhibiting the creep of the material, and when the mass concentration of cobalt chloride was 1.3 g/L, the 60 min creep of borate ester bond-crosslinked ENR decreased by 40.7% compared to the blank sample, while at higher temperatures, the cobalt ion(Ⅱ)-oxygen metal coordination bond was dissociated, and the material could still be reshaped and reprocessed.
|
|---|---|
| ISSN: | 1000-1255 |