2.氨纶知识（2. spandex knowledge）.doc

2.氨纶知识（2. spandex knowledge） The actual index range of two, conventional varieties, here refers to the conventional physical property index of Denier (g) breaking strength and breaking elongation (%) 300% elongation stress (g) 300% elongation recovery percentage (%) of boiling water shrinkage (%) 20 = 22425 + 75 = 6 = 96 = 1830 = 33435 + 75 = = 10 96 = 1840 = 44445 + 75 = 13 = 96 = 1370 = 75480 + 75 = 17 = 95 = 11105 = 95485 + 75 = 23 = 95 = 10110 = 99485 + 75 = 24 = 95 = 9140 = 106490 + 75 = 31 = 95 = 7210 = 180500 + 75 = 40 = 95 = = 7280 240550 + 75 = 51 = 95 = 5420 = 350570 + 75 = 65 = 95 = 5840 = 630610 + 75 = 115 = 95 = 51120 = 785610 + 75 = 140 = 95 = 5: 1, the differences between different instruments as a result, currently used for strength testing of spandex strength tester has many kinds of and different instrument Chuck different impact test data of the key parts of the clamping device of the sample, summed up the above met the approximate range of 2, spandex physical indexes of different test methods of the data differences, on the table in the strength and elongation, 3 times of stress is a stretch of three, molecular structure and properties of molecular structure with the properties of molecular structure and properties of the molecular structure and properties of 1, spandex is a kind of polyurethane block copolymer, its molecular is composed of flexible chain segments and rigid segments composed of alternating between chain segments, covalently linked to. Flexible segment: segment length (15~20) *10-3 mu m, for polyester or polyether, has a low glass temperature, at room temperature in high elastic state (rubber). Since each single link in the chain segments rotates in different degrees around its adjacent single key, the flexible segment is twisted in shape. The intermolecular force is weak and amorphous. A rigid chain segment: segment length (2.5~3.5) *10-3, m, urethane or urea based, has a high glass transition temperature and is glassy at room te