| 查看: 342 | 回复: 0 | |||
[交流]
TG-DTG技术表征橡胶的硫化
|
|
Two common problems in the TG-DTG analysis of unknown elastomer vulcanizates and probable solutions are discussed. The first problem concerns the difficulty in quantitatively determining the oil and elastomer in the compound in cases where their volatilization temperature range overlaps. After a review of the published works which studied this problem, isothermal TG (with or without vacuum) along with the use of "High Resolution" TG equipment is recommended. The second problem concerns separate determination of carbon residue from the elastomers and added carbon black in the compound, which very often oxidizes together. Subtraction of the carbon residue formed by the elastomers, determined by previous analyses, from the total weight loss in oxygen, was suggested in the literature. However, the quantity of char depends on type of the elastomer, as well as its concentration, curative type and amount and rate of heating. The problem is not, therefore, fully resolved. Experiments under slow feed of lean oxygen gas and isothermal temperature were also suggested in the literature. Under this condition, oxidation of carbon black and char may occur at slightly different temperatures and overlapping is minimized. However, this could be achieved only for large and medium particle size blacks (soft blacks) which oxidize at higher temperatures and not for the smaller particle size blacks, (used mostly in tire treads). Further work under slow feed of lean oxygen with a superimposed isothermal program and/or vacuum is recommended. The capability of the recently announced "High Resolution Thermogravimetric Analyzer" should also be explored. |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：libolin3@tal.com - 附件 1 : TG-DTG的技术表征橡胶的硫化.PDF
2016-03-30 15:16:53, 482.56 K
» 猜你喜欢
近期有投Journal of Porous Materials的吗？
已经有1人回复
-
甲苯催化氧化
已经有5人回复
-
化学工程及工业化学论文润色/翻译怎么收费?
已经有275人回复
-
1,3-丙磺酸内酯
已经有8人回复
-
甲苯鼓泡器
已经有2人回复
-
MOF模板材料
已经有11人回复
-
投稿求助
已经有1人回复
-
烯烃与亚硫酸氢钠反应选择性
已经有0人回复
-
氯代碳酸乙烯酯合成碳酸亚乙烯酯
已经有1人回复
-
MOF-303的电负性
已经有0人回复
50