Table 1.

Spectral data * and band assignments of FTIR analysis presented in Figure 2.

Native PUR and MPTL Scaffold
Wavelength (cm−1)	Assignments
3319 w	N–H stretching, (urethane bonding)
2930 w, 2859 w	CH3; CH2 (aliphatic) asymmetric and symmetric stretching bonding
1726 vs, 1655 w	C=O stretching of non-hydrogen bonded urethane groups and well ordered and strongly hydrogen bonded urethane groups respectively
1527 m	deformation bond N–H
1451 w, 1420 vw, 1354 vw, 1314 s	planar bonds of symmetric and asymmetric CH2
1221 s	N–C stretching (urethane bonding)
1168 s, 1138 s	CO–O stretching of ester
1080 m, 1036 m	C–O stretching of urethane groups
969 vw, 943 vw, 871 vw, 779 w	Out of plane bondings of C–H (bending), CH2 scissoring; CH2 wagging; NH and OH scissoring and wagging

vw—very weak, w—weak, m—medium, s—strong, vs—very strong.