High Azide Content Hyperbranched Star Copolymer as Energetic Materials

Guangpu Zhang, Gangfeng Chen, Jinqing Li, Shixiong Sun, Yunjun Luo*, Xiaoyu Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

A series of star azide copolymers (b-POBs) with hyperbranched polyether cores (HBPO-c) and short linear poly(3,3′-bis-azidomethyl oxetane) arms (PBAMO-a) have been prepared. The polymers were characterized with FT-IR, 1H NMR, quantitative 13C NMR, gel permeation chromatography, MALDI-TOF, and X-ray diffractometry. Due to hyperbranched structures, the crystallinity (Wc) of b-POBs was significantly decreased, and the processability was greatly improved. The enthalpy of formation, obtained by oxygen bomb calorimetric measurements, high azide content, and heats of decomposition of b-POBs demonstrated their remarkable energy level. Furthermore, b-POBs had good resistance to pyrolysis up to 230 °C (T5%), and their mechanical sensitivities were also obviously lower than that of the PBAMO homopolymer, showing their good safety properties. Moreover, the mechanism for sensitivity reduction of b-POBs was established by analyzing the relationship between the activation course in mechanical stimulus and its crystalline structure.

Original languageEnglish
Pages (from-to)13962-13972
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume57
Issue number42
DOIs
Publication statusPublished - 24 Oct 2018

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