Study on under-water sound absorption properties of Eucommia ulmoides gum and its blends
Study on under-water sound absorption properties of Eucommia ulmoides gum and its blends
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DOI：
10.1007/s00289-011-0489-9
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发表时间：
2011-05
期刊：
影响因子：
3.2
通讯作者：
Jichuan Zhang;Zhaohong Xue
中科院分区：
文献类型：
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作者：
Jichuan Zhang;Zhaohong Xue
摘要 对杜仲胶及其与常规阻尼橡胶的共混物的吸声性能进行了系统研究。将20%、40%EU胶掺入氯丁二烯橡胶（CR）中，其3-20kHz水下吸声性能明显优于CR。将10%、20%、30%和40%的EU胶掺入氯化异丁烯-异戊二烯橡胶（CIIR）中，其在3-20kHz下的吸声性能也明显优于CIIR，特别是EU胶/CIIR（20/80）在3kHz下的SAC等于76%，在低频区域有很大的提高。结果表明，EU胶存在一个临界掺混比例，即50%，如果EU胶>50%，则其水下吸声性能很差，如果EU胶<50%，则其水下吸声性能很好。阻尼橡胶的弛豫吸收、EU胶微晶的空间漫反射吸收以及结晶硬相与橡胶软相界面的剪切变形吸收是其水下吸声性能的三个主要原因。另外，降低交联度可以提高水下吸声性能。图文摘要EU胶的共混比例存在一个临界值，即50%。如果EU胶>50%，则共混物中EU胶的晶体尺寸仍然较大，可以像纯EU胶一样反射入射声波，因此其水下声学性能很差；如果EU胶<50%，共混物中EU胶的晶体会破碎成许多微晶，散布在橡胶基体中，像海中的岛屿一样，可以更多次地反射入射声波，因此其水下声学性能大大提高。
AbstractThe sound absorption performances ofEucommia ulmoides(EU) gum and its blends with conventional damping rubber are studied systematically. Blending 20%, 40% EU gum into chlorobutadiene rubber (CR), their under-water sound absorption property at 3–20 kHz is better obviously than that of CR. Blending 10, 20, 30, and 40% EU gum into chlorinated isobutene-isoprene rubber (CIIR), their sound absorption properties at 3–20 kHz are also better obviously than those of CIIR, especially the SAC of EU gum/CIIR (20/80) at 3 kHz is equal to 76% which is a great increase at low frequency region. The results show that a critical blend ratio of EU gum exists which is equal to 50%, if EU gum >50%, their under-water sound absorption properties are very poor, if EU gum <50%, their under-water sound absorption properties are very good. The relaxation absorption of damping rubber, the spacial diffuse reflection absorption of EU gum crystallites, and the shear deformation absorption in the interface between crystalline hard phase and rubber soft phase are the three main reasons to contribute their under-water sound absorption properties. In addition, reducing crosslinking degree can increase under-water sound absorption property.Graphical abstractA critical value of blend ratio of EU gum exists which is equal to 50%. If EU gum >50%, the size of crystal of EU gum in the blend is still large which can reflect the incident sound wave like pure EU gum, so its under-water sound property is very poor; if EU gum <50%, the crystal of EU gum in the blend could be broken into many microcrystals scattering in the rubber matrix, like island in the sea, which can reflect incident sound wave more times, so its under-water sound property increase greatly.