Contrast with single base gun propellant with polymer coating layer, the two-layered variable-burning rate propellant has good properties of progressive combustion and low temperature coefficient.

与高分子包覆单基发射药相比，双层结构变燃速发射药具有较好的燃烧渐增特性和明显的低温度系数效果。

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It studied the influences of alloy elements, processing temperature, contents of metal and additives on the fracture section morphology of low-melting alloy filled polymer.

研究了合金元素、加工温度、金属含量、第三组分对低熔点金属填充聚合物材料断口形貌的影响。

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Test results indicate the force ductility test is a simple and effective mean of characterization of low temperature tension properties of polymer modified asphalt.

试验结果表明，测力延度试验可以比较全面的反映改性沥青的低温拉伸性能，是评价改性沥青低温性能的简单有效的方法。

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