A MECHANOCHROMIC SMART MATERIAL
A MECHANOCHROMIC SMART MATERIAL
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DOI：
10.1007/bf00692965
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发表时间：
1993-09-01
期刊：
影响因子：
3.2
通讯作者：
RENEKER, DH
中科院分区：
文献类型：
--
作者：
KIM, SJ;RENEKER, DH
合成了一种力致变色聚氨酯弹性体。偶氮苯生色团被引入到共聚酰胺低聚物中以提供构象锁存器，该构象锁存器通过形成分子内氢键来稳定顺式偶氮苯。将共聚酰胺低聚物化学插入聚氨酯共聚物中。所得共聚物中的发色团通过紫外线（UV）照射（λ = 365 nm）转化为顺式形式，然后拉伸并松弛至100%、200%和300%的应变。在100%应变和松弛后，聚氨酯共聚物在λ = 380 nm处的吸光度（其表明转化为反式）没有显著增加。然而，随着200%和300%的拉伸应变，随后松弛，吸光度增加。因此证明了松弛样品中λ = 380 nm处的吸光度增加与样品所经受的最大应变之间的机械致变色关系。
A mechanochromic polyurethane elastomer was synthesized and demonstrated. Azobenzene chromophores were introduced into a copolyamide oligomer to provide conformational latches which stabilized the cis-azobenzenes by the formation of intramolecular hydrogen bonds. The copolyamide oligomer was chemically inserted into a polyurethane copolymer. The chromophores in the resulting copolymer were transformed to the cis-form by ultraviolet (UV) irradiation (lambda = 365 nm) and then succesively stretched and relaxed to strains of 100 %, 200 %, and 300 %. After 100 % strain and relaxation, the absorbance of polyurethane copolymer at lambda = 380 nm, which indicates transformation to the trans form, was not significantly increased. However, the absorbance increased with 200 % and 300 % tensile strain followed by relaxation. A mechanochromic relationship between absorbance increase at lambda = 380 nm in the relaxed sample and the maximum strain to which the sample was subjected was thus demonstrated.