摘要
研究了各牌号天然橡胶结构,以研究微观结构对天然橡胶各性能的影响。本文采用红外光谱(FTIR)、X射线衍射(XRD)、核磁共振(nmR)、热重分析(TG)等多种手段对泰国产1号烟片、马来西亚产3号烟片、马来西亚产1号烟片和印度尼西亚1号标准胶等四种牌号天然橡胶的微观结构进行了表征,并对各牌号天然橡胶硫化胶进行了一系列测试。实验结果表明:各牌号天然橡胶生胶分子结构相同,均以顺式结构为主。马来西亚产1号烟片和印度尼西亚1号标准胶的结晶程度较好,而泰国产1号烟片具有最高的门尼黏度与黏均分子量。各牌号天然橡胶在空气与氮气中的热稳定性相似。各牌号天然橡胶的门尼黏度大小顺序为:1~#>2~#>3~#>4~#。各牌号天然橡胶的黏均分子量大小顺序为:1~#>4~#>2~#>3~#。各牌号天然橡胶在空气中分三阶段进行热分解,而在氮气中的热分解仅为一阶段。各胶料在空气与氮气中的热稳定性大体相同。
The structure of each grade of natural rubber and its influence on the properties of natural rubber were studied. In this paper, infrared spectroscopy(FTIR), X-ray diffraction(XRD), nuclear magnetic resonance(nmR), thermogravimetric analysis(TG) and other methods were used to test the microstructure of smoked rubber sheet No. 1 in Thailand, Malaysia No. 3 smoked rubber sheet, Malaysia No. 1 smoked rubber sheet and Indonesia standard rubber, and a series of tests were performed on each grade of natural rubber vulcanizate. The experimental results showed that the molecular structure of each grade of natural rubber raw rubber is the same, all of which are mainly cis-structures. Malaysian No. 1 smoked rubber sheet and Indonesian No. 1 standard rubber have better crystallinity, while Thai No. 1 rubber has the highest Mooney viscosity and viscosity average molecular weight. The thermal stability of each grade of natural rubber in air and nitrogen was similar. The order of Mooney viscosity of each grade of natural rubber was: 1~#> 2~#> 3~#> 4~#. The order of viscosity average molecular weight was: 1~#> 4~#> 2~#> 3~#. Each grade of natural rubber was thermally decomposed in three stages in the air, while the thermal decomposition in nitrogen was only one stage. The thermal stability of each rubber in air and nitrogen was substantially the same.
作者
赵婧
Zhao Jing(Yulin Kangnaiya New Material Technology Co.LTD.,Yulin 718100,China)
出处
《橡塑技术与装备》
CAS
2020年第3期15-21,共7页
China Rubber/Plastics Technology and Equipment
关键词
分子结构
结晶程度
热稳定性
天然橡胶
性能影响
molecular structure
degree of crystallization
thermal stability
natural rubber
performance effect
