Polymeric
materials that simultaneously possess excellent mechanical
properties and high self-healing ability at room temperature, convenient
healing, and facile fabrication are always a huge challenge. Herein,
we report on surface-energy-driven self-healing energetic linear polyurethane
elastomers (EPU) that were facilely fabricated by two-step methods
to acquire high healing efficiency and mechanical properties. By constructing
surface energy and dynamic hard domains, energetic linear polyurethane
elastomers not only obtained high healing ability and mechanical properties
at high or room temperature but also avoid the use of some assisted
healing conditions and complex chemical structure design and decrease
manufacturing difficulty. Based on the interfacial healing physical
model, various trends of surface tension, radius, and depth of the
crack bottom were calculated to analyze the healing mechanism. We
propose that polyurethane elastomers with low junction density could
generate excess surface energy resulting from damage and drive self-healing,
and incorporating a small amount of disulfide bonds increases the
slightly packed hard phase and decreases the healing energy barrier.
This work may offer a novel strategy for improving mechanical tensile
and healing ability in the field of self-healing material application.
In this paper, creep tests were carried out on HTPE/AP/Al/RDX propellant specimens to investigate the effects of stress level and temperature on their creep behavior and to investigate the creep mechanism. Higher stresses and temperature can cause greater creep strain in the propellant, ultimately leading to its destruction. On this basis, the creep master curve was further obtained based on the Time‐Temperature Superposition Principle (TTSP), extending the creep investigation time range to 1010 s. Based on previous experience, some explorations have been made on constitutive equations. The burgers model fits the creep behavior under different conditions more closely, while the Norton model has higher stress sensitivity.
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