采用自制装置对聚碳硅烷(PCS)熔体进行预处理.通过预处理获得三种不同分子量的PCS,并对其进行物理化学和稳态流变性能测试.结果表明,预处理后的PCS其数均分子量为1000 g/mol～1400g/mol,属低聚物.在温度范围240℃～260℃和剪切速率范围0.001 s-1～10 s-1内有明显的剪切变稀现象.在测试的温度范围内,剪切变稀区的非牛顿指数随温度升高先减小后增大.预处理后的PCS粘流活化能为120 kJ/mol～180 kJ/mol,比一般高聚物的高得多.
参考文献
| [1] | Idesaki A.;Okamura K.;Sugimoto M.;Tanaka S.;Morita Y. Seguchi T.;Itoh M.;Narisawa M. .Fine SiC fiber synthesized from organosilicon polymers: relationship between spinning temperature and melt viscosity of precursor polymers[J].Journal of Materials Science,2001(23):5565-5569. |
| [2] | 刘辉,王应德,冯春祥,吴文华,朱美芳,陈彦模.聚碳硅烷流变性能的研究[J].合成纤维工业,2001(05):23-25. |
| [3] | 谭惠平,陈建山,姜艺,王应德.熔融纺丝制备聚碳硅烷有机先驱体纤维[J].化工新型材料,2005(09):33-35,42. |
| [4] | H. Q. LY;R. TAYLOR;R. J. DAY;F. HEATLEY .Conversion of polycarbosilane (PCS) to SiC-based ceramic Part 1. Characterisation of PCS and curing products[J].Journal of Materials Science,2001(16):4037-4043. |
| [5] | Greta Kresic;Vesna Lelas;Anet Rezek Jambrak;Zoran Herceg;Suzana Rimac Brncic .Influence of novel food processing technologies on the rheological and thermophysical properties of whey proteins[J].Journal of food engineering,2008(1):64-73. |
| [6] | Muksing N;Nithitanakul M;Grady BP;Magaraphan R .Melt rheology and extrudate swell of organobentonite-filled polypropylene nanocomposites[J].Polymer Testing,2008(4):470-479. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%