Aging and mechanical properties of NR/BR blends |
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Authors: | Hsien-Tang Chiu Peir-An Tsai |
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Affiliation: | (1) Department of Polymer Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Sect. 4, 10607 Taipei, Taiwan, Republic of China |
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Abstract: | The mechanical properties and post-thermal aging properties of natural rubber (NR) and polybutadiene rubber (BR) blends at
different blending ratios are investigated herein. The experimental results show that both tensile and tear strengths of NR/BR
blends increase with increasing NR content. BR has a higher compression stiffness than NR. The deformation of BR is less than
that of NR under the same load conditions. With regard to aging properties, both tensile stress and strain of NR/BR blends
decrease after prolonged aging. In addition, the stress loss of BR is lower than that of NR, meaning that the aging resistance
property of BR is superior to that of NR. Furthermore, accumulated thermal history has shifted the glass transition temperature
(T
g) of NR/BR blends toward lower temperatures while the loss tangent (tan δ) value increases with prolonged thermal aging. |
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Keywords: | compression stiffness glass transition temperature loss tangent natural rubber polybutadiene rubber |
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