Patent ID: 8354486

Claim:
A solid monomer composition comprising a first monomer and a second monomer, each said monomer having the formula: CH 3 (CH 2 ) m1 NHCONH(CH 2 )(—C≡C—) 2 (CH 2 ) NHCONH(CH 2 ) m5 CH 3 ; wherein in the first monomer m1 and m5 are both 1; in the second monomer m1 and m5 are both 2; the solid monomer composition can exhibit an X-ray powder diffraction spectrum having three reflection peaks between a d spacing of about 4.28 Å and a d spacing of about 3.81 Å, the diffraction spectrum being collected using CuK α1 radiation; the three reflection peaks comprise a long spacing peak at a d spacing in the range of from about 4.28 Å to about 4.18 Å, an intermediate spacing peak at a d spacing in the range of from about 4.11 Å to about 3.99 Å, and a short spacing peak at a d spacing in the range of from about 3.94 Å to about 3.81 Å; and the solid monomer composition is thermally polymerizable to have a changed visual appearance.