杜仲胶/天然橡胶并用胶的热氧老化性能
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摘要
通过改变杜仲胶(EUG)/天然橡胶(NR)的共混比对EUG/NR并用胶的热氧老化性能进行研究。将EUG/NR并用胶在老化箱中进行加速老化。通过机械性能、交联密度、红外分析和热稳定性来评估EUG/NR并用胶的老化性能。结果表明,随着老化时间的增加,EUG/NR并用胶的拉伸强度和断裂伸长率逐渐下降,100%定伸应力、硬度和交联密度逐渐增大;EUG/NR并用胶在老化5d时交联效应占优势,交联反应主要发生在老化过程中;EUG用量为10～20份时,EUG/NR并用胶的抗热氧老化性能并未明显下降。此外,热重分析(TGA)表明,在老化5d时,EUG/NR并用胶在热氧老化过程中分子主链及交联网络并未出现明显的破坏。
In this paper,the thermo-oxidative aging properties of EUG/NR were studied by changing the blending ratio of Eucalyptus gum(EUG)/natural rubber(NR).The EUG/NR was glued to the accelerated aging in the aging tank.The aging properties of the EUG/NR were evaluated by mechanical properties,crosslinking density,infrared analysis and thermal stability.The results showed that the tensile strength and elongation at break of the EUG/NR combined adhesive gradually decrease with the increase of aging time,and the 100% modulus,hardness and crosslink density increase gradually.The cross-linking effect of the initial aging of EUG/NR combined predominates,and the crosslinking reaction mainly occurs in the aging process.When the content of EUG is 10～20 phr,the antiheat aging performance of the combined is not significantly decreased.In addition,thermogravimetric analysis(TGA)showed that there was not significant damage to the molecular backbone and crosslinked network during the thermal aging process.
In this paper,the thermo-oxidative aging properties of EUG/NR were studied by changing the blending ratio of Eucalyptus gum(EUG)/natural rubber(NR).The EUG/NR was glued to the accelerated aging in the aging tank.The aging properties of the EUG/NR were evaluated by mechanical properties,crosslinking density,infrared analysis and thermal stability.The results showed that the tensile strength and elongation at break of the EUG/NR combined adhesive gradually decrease with the increase of aging time,and the 100% modulus,hardness and crosslink density increase gradually.The cross-linking effect of the initial aging of EUG/NR combined predominates,and the crosslinking reaction mainly occurs in the aging process.When the content of EUG is 10～20 phr,the antiheat aging performance of the combined is not significantly decreased.In addition,thermogravimetric analysis(TGA)showed that there was not significant damage to the molecular backbone and crosslinked network during the thermal aging process.
引文
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[2]BABOO M.Study on thermal and mechanical properties of cis-and trans-polyisoprene blends implanted by carbon ions[J].Nuclear Instruments&Methods in Physics Research,2011,269(21):2479-2486.
[3]BABOO MAHESH,SHARMA KANANBALA,SAXENAN S.Viscosity,glass transition and activation energy of solid cis-polyisoprene and trans-polyisoprene blends[J].Phase Transitions,2011,84(11-12):901-907.
[4]严瑞芳.杜仲胶研究新进展[J].化学通报,1991(1):1-6.
[5]ZHANG J C,XUE Z.A comparative study on the properties of Eucommia ulmoides gum and synthetic trans-1,4-polyisoprene[J].Polymer Testing,2011,30(7):753-759.
[6]SARINA,ZHANG J,ZHANG L.Dynamic mechanical properties of Eucommia ulmoides gum with different degree of cross-linking[J].Polymer Bulletin,2012,68(7):2021-2032.
[7]我国率先实现杜仲橡胶航空轮胎应用[J].橡胶工业,2018,65(1):24.
[8]金冰,等.天然橡胶的热氧老化研究[J].特种橡胶制品,2003:24(2):41-44.
[9]杨清芝.现代橡胶工艺学[M].北京:中国石化出版社,1997.
[10]王琎,康海澜,杨凤,等.杜仲胶/天然橡胶并用硫化胶的力学性能[J].高分子材料科学与工程,2017,33(8):62-67.
[11]刘倩,岳红,江浩,等.杜仲胶/天然橡胶共混物的分子动力学模拟和耗散粒子动力学模拟[J].材料导报,2012,26(6):141-145.
[12]姚薇,孙静,邵华锋,等.环氧化反式异戊橡胶/天然橡胶并用胶的疲劳和动态性能[J].高分子材料科学与工程,2013,29(9):44-47.
[13]李良萍,李翔,薛兆弘,等.天然橡胶/杜仲胶共混硫化胶性能研究[J].特种橡胶制品,2001(3):1-3.
[14]张蕊,杨凤,方庆红.杜仲/天然共混硫化胶的结晶与动态力学性能[J].高分子材料学与工程,2015,31(9):106-111.
[15]LIU J,LI X,XU L,et al.Investigation of aging behavior and mechanism of nitrile-butadiene rubber(NBR)in the accelerated thermal aging environment[J].Polymer Testing,2016,54:59-66.