少烟复合改性双基（CMDB）推进剂力学性能研究

A STUDY ON MECHANICAL PROPERTIES OF REDUCED SMOKE COMPOSITE MODIFIED DOUBLE-BASE PROPELLANT

关键词:  复合改性双基推进剂  少烟推进剂~＋  应变  拉伸强度

Key words:  Modified composite double-base propellant  Reduced smoke propellant  Strain  Tensile strength

摘要:

在混合硝酸酯ＮＧ／ＢＴＴＮ（ＤＥＧＮ）＝１和溶棉比ＮＧ＋ＢＴＴＮ（ＤＥＧＮ／ＮＣ＋ＰＥＧ＝３．５～４．０的少烟复合改性双基推进剂配方中，选择聚乙二醇（ＰＥＧ）预聚物取代部分ＮＣ，研究了其含量和分子量变化对力学性能的影响。发现当ＰＥＧ含量为４％，ＮＣ为７％时，在两种混合增塑剂中都可使－４０℃下最大延伸率超过４０％。从溶涨实验中观察到，随着配方中ＰＥＧ含量增加，尽管［ＮＣＯ］／［ＯＨ］值也增加，但相对交联点密度降低，因而改善了力学性能。

Abstract:

n compositions of reduced smoke composite modified double-base propellant (CMDB) with a mixture of nitrate ester NG/BTTN (DEGN)=1 and a ratio of . solvent to nitrocellulose NG+BTTN (DEGN ) /NC + PEG =3.5～4.0,polyethylene glycol (PEG) has been chosen as a prepolymer to substitute for a part of nitrocellulose (NC) to investigate the effects of its varying content and molecular weight on propellant’s mechanical properties. In both of mixing plasticizers, the maximum elogation at -40℃ was noticed to exceed 40% when the propellant contains 4% PEG and 7% NC. It was observed in the swelling experiment that although the value of [NCO]/[OH] increases as increasing the PEG content,the relative cross-linking density decreases so as to improve the mechanical properties.