| 摘要 |
<p>Articles such as vests, helmets and structural elements containing a network of ultrahigh molecular weight, high strength, high modulus polyethylene or polypropylene fibers. The fibers, and especially polyethylene fibers of 15, 20, 25, 30 or more g/denier tenacity, and 300, 500, 1000, 1500 or more g/denier tensile modulus impart exceptional ballistic resistance to the articles in spite of the melting points, e.g. 145 DEG -151 DEG C. for the polyethylene fibers and 168 DEG -171 DEG C. for the polypropylene fibers, which are high for these polymers, but substantially lower than the 200 DEG C. or more melting point previously thought necessary for good ballistic resistance.</p> |
