中国塑料 ›› 2022, Vol. 36 ›› Issue (11): 101-107.DOI: 10.19491/j.issn.1001-9278.2022.11.015

• 加工与应用 • 上一篇    下一篇

高填充固体推进剂模拟物加工流变行为的实验研究

林祥1(), 张军2   

  1. 1.北京科技大学化学与生物工程学院,北京 100083
    2.西安近代化学研究所,西安 710065
  • 收稿日期:2022-04-13 出版日期:2022-11-26 发布日期:2022-11-25
  • 作者简介:林祥(1983—),男,副教授,从事高分子材料加工成型研究,linxiang@ustb.edu.cn
  • 基金资助:
    中央基本科研业务基金(FRF?GF?20?18B);西安近代化学研究所国家重点实验室开放基金(204?J?2020?1018)

Experimental study on rheological properties of highly filled solid propellant simulant

LIN Xiang1(), ZHANG Jun2   

  1. 1.School of Chemistry and Biological Engineering,University of Science and Technology Beijing,Beijing 100083,China
    2.Xi’an Modern Chemistry Research Institute,Xi’an 710065,China
  • Received:2022-04-13 Online:2022-11-26 Published:2022-11-25

摘要:

针对高填充固体推进剂模拟物,围绕其在稳态剪切及动态剪切模式下的流变特性,分别采用出口增压式毛细管流变仪及旋转流变仪,在100~120 ℃及50~100 ℃下考察了压力与剪切振荡幅度对物料剪切黏度(η)的影响,计算了熔体压力对η的敏感性参数并提出了针对该类物料真实η的有效修正方法及低剪切法向力下的测试方法。稳态剪切测试结果表明,熔体压力介于12~121 MPa之间时,其压力敏感性参数介于4.81~9.65 GPa-1发生变化,相同温度及剪切速率下熔体η随压力表现出幂指数的递增变化规律;动态剪切测试表明,即使在不高于50 N的熔体剪切法向力作用下(法向力15~42 N),高填充模拟物η在0.01~100 s-1内也会表现出大约2倍的差异;对于表现出强类固体特征的高填充模拟物复杂体系,动态剪切测试中的剪切应变振幅对η的测试结果影响明显,尤其在低温大振幅剪切情况下,高填充物料与剪切平板之间还易发生“打滑”。

关键词: 聚合物, 高填充固体推进剂模拟物, 流变, 黏度, 压力.

Abstract:

The rheological properties of a highly filled solid propellant stimulant were studied using capillary and rotational rheometers under the steady shear and dynamic shear conditions. The effects of melt pressure and shear amplitude on the shear viscosity of the solid propellant stimulant were investigated in the temperature ranges of 100~120 ℃ and 50~100 ℃, respectively. The dependency of shear viscosity on the melt pressure was evaluated through a pressure coefficient, correcting the effect of pressure on viscosity. The results indicated that the pressure coefficient was distributed between 4.81 and 9.65 GPa-1 at a pressure between 12 and 121 MPa. The shear viscosity of the solid propellant stimulant increased as a power⁃law trend, indicating a steady capillary shear. In addition, dynamic shear test results indicated that the viscosity of solid propellant stimulant increased two times when the normal force rose from 15 to 42 N. Furthermore, the effect of shear amplitude on the rheological properties of the highly filled solid propellant stimulant was found to be sensitive. A slip occurred between the sample and plate at a relatively low temperature and large shear amplitude. This should be avoided in practical use.

Key words: polymer, highly filled solid propellant stimulant, rheology, viscosity, pressure

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