密度 | 1.3?g/mL?at 25?°C(lit.) |
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熔点 | 230-300℃ |
分子式 | [C6H7O2(OH)3-m(OOCCH3)m],m=0~3 |
外观性状 | Powder | White |
折射率 | n20/D 1.475(lit.) |
储存条件 |
贮存于阴凉、通风、干燥的库房内 |
稳定性 |
常温常压下稳定 避免光,明火,高温, |
更多 |
1. 性状:白色胶状物 2. 密度(g/mL,25℃):1.3 3. 相对蒸汽密度(g/mL,空气=1):未确定 4. 熔点(oC):未确定 5. 沸点(oC,常压):未确定 6. 沸点(oC,5.2kPa):未确定 7. 折射率:1.475 8. 闪点(oC):未确定 9. 比旋光度(o):未确定 10. 自燃点或引燃温度(oC):未确定 11. 蒸气压(kPa,20oC):未确定 12. 饱和蒸气压(kPa,60oC):未确定 13. 燃烧热(KJ/mol):未确定 14. 临界温度(oC):未确定 15. 临界压力(KPa):未确定 16. 油水(辛醇/水)分配系数的对数值:未确定 17. 爆炸上限(%,V/V):未确定 18. 爆炸下限(%,V/V):未确定 19. 溶解性:不溶于水、稀酸和几乎所有的有机溶剂。微溶于氢氧化钠溶液和热的干酪素钠液中 |
醋酸纤维素毒性英文版
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个人防护装备 |
Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter |
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危险品运输编码 | NONH for all modes of transport |
WGK德国 | - |
海关编码 | 39121100 |
1.将精制短棉绒干燥后,经醋酸活化,再在醋酸催化剂存在下,与醋酸和醋酐混合液进行酯化反应,使之乙酸化,然后加稀醋酸水解。中和催化剂,使产物深沉析出,经脱酸洗淀、精煮、干燥可得。
2.将精制短棉绒干燥后,经醋酸活化,再在硫酸催化剂存在下,与7倍于精制短棉绒的醋酸和醋酐混合液进行酯化反应,使之乙酸化,然后加稀醋酸水解到所需要的水解度(1.72~1.95)。中和催化剂,使产物沉淀析出,经脱酸洗涤、精煮、干燥后即得一醋酸纤维素。在乙酰化反应时,改变加入的醋酸和醋酐混合液的量,可制得二醋酸纤维素和三醋酸纤维素。醋酸和醋酐混合液的量为精制短棉绒的8.5倍,反应毕加稀醋酸水解达到取代度为2.28~2.49,得到二醋酸纤维素。醋酸和醋酐混合液的量为精制短棉绒的10倍,反应毕加稀醋酸水解达到取代度为2.8~2.9,得到三醋酸纤维素。
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The aim of this study was to investigate physicochemical characteristics and to determine in vitro release kinetics of prepared nicotinamide microemulsion-based gels (MBGs). Nicotinamide microemulsion…
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In this paper we explore the direct transfer via lamination of chemical vapor deposition graphene onto different flexible substrates. The transfer method investigated here is fast, simple, and does no…
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MFCD00081496 |