NDLI: Study on under-water sound absorption properties of Eucommia ulmoides gum and its blends

Content Provider	Springer Nature Link
Author	Zhang, Jichuan Xue, Zhaohong
Copyright Year	2011
Abstract	The sound absorption performances of Eucommia 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.A 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.
Starting Page	511
Ending Page	525
Page Count	15
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	67
Issue Number	3
e-ISSN	14362449
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eucommia ulmoides gum Gutta percha Tanδ Dynamic mechanical properties Acoustic properties Sound absorption coefficient Physical Chemistry Soft and Granular Matter, Complex Fluids and Microfluidics Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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