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热加速老化对端羟基聚丁二烯涂层动态力学性能及Payne效应交联密度修正模型的影响

Influence of Thermally-Accelerated Aging on the Dynamic Mechanical Properties of HTPB Coating and Crosslinking Density-Modified Model for the Payne Effect.

作者信息

Du Yongqiang, Zheng Jian, Yu Guibo

机构信息

Shijiazhuang Campus, Army Engineering University, Shijiazhuang 050003, China.

出版信息

Polymers (Basel). 2020 Feb 11;12(2):403. doi: 10.3390/polym12020403.

DOI:10.3390/polym12020403
PMID:32053946
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7077712/
Abstract

Hydroxyl terminated polybutadiene (HTPB) coating is widely used in a solid rocket motor, but an aging phenomenon exists during long-term storage, which causes irreversible damage to the performance of this HTPB coating. In order to study the effect of aging on the dynamic mechanical properties of the HTPB coating, the thermally-accelerated aging test was carried out. The variation of maximum elongation and crosslinking density with aging time was obtained, and a good linear relationship between maximum elongation and crosslinking density was found by correlation analysis. The changing regularity of dynamic mechanical properties with aging time was analyzed. It was found that with the increase of aging time, of HTPB coating increased, , and decreased, and the functional relationships between the loss factor parameters and crosslinking density were constructed. The storage modulus and loss modulus of HTPB coating increased with the increase of aging time, and decreased with the increase of pre-strain. The aging enhanced the Payne effect of HTPB coating, while the pre-strain had a weakening effect. In view of the Payne effect of HTPB coating, the crosslinking density was introduced into Kraus model as aging evaluation parameter, and the crosslinking density modified models with and without pre-strain were established. The proposed models can effectively solve the problem that the Kraus model has a poor fitting effect under the condition of small strain (generally less than 1%) and on the loss modulus, which have improved the correlations between the fitting results and the test results.

摘要

端羟基聚丁二烯（HTPB）涂层在固体火箭发动机中广泛应用，但在长期储存过程中存在老化现象，这对该HTPB涂层的性能造成不可逆损害。为研究老化对HTPB涂层动态力学性能的影响，进行了热加速老化试验。得到了最大伸长率和交联密度随老化时间的变化情况，并通过相关性分析发现最大伸长率与交联密度之间存在良好的线性关系。分析了动态力学性能随老化时间的变化规律。发现随着老化时间增加，HTPB涂层的 增加， 、 和 减小，并构建了损耗因子参数与交联密度之间的函数关系。HTPB涂层的储能模量和损耗模量随老化时间增加而增大，随预应变增加而减小。老化增强了HTPB涂层的Payne效应，而预应变具有减弱作用。针对HTPB涂层的Payne效应，将交联密度引入Kraus模型作为老化评价参数，建立了有和没有预应变的交联密度修正模型。所提出的模型能有效解决Kraus模型在小应变（一般小于1%）条件下对损耗模量拟合效果差的问题，提高了拟合结果与试验结果之间的相关性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ee48/7077712/8769353e25c9/polymers-12-00403-g015a.jpg
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