| 摘要 |
Disclosed herein are soft and stiff compositions, i.e., compositions which have a flexural modulus that is greater than the value that is expected based on the composition's hardness. The compositions preferably have a hardness/modulus relationship represented by the formula H≦̸11.889Ln(M)+42, where H is the hardness of the composition, in JIS-C, and M is the flexural modulus of the composition, in ksi; or a softness/stiffness relationship represented by the formula if M<56, then H≦̸8.5218Ln(M)+26.5 if M≧56, then H≦̸8.5218Ln(M)+28.5, where H is the hardness of the composition, in Shore D, and M is the flexural modulus of the composition, in ksi.
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