A normal mode analysis of form I syndiotactic poly(1-butene)

Molecular Chain Movements and Transitions of SEBS above Room Temperature Studied by Moving-Window Two-Dimensional Correlation Infrared Spectroscopy

“…The IR spectrum of SEBS is the overlapping of S block (atactic polystyrene) and EB block (poly-(ethylene-co-1-butene)) IR spectra (not displayed here). According to the literature, [37][38][39][40][41][42][43][44][45][46][47] the bands assignment of SEBS spectrum are summarized in Table 1.…”

“…Generally, the weak crystalline of -(CH 2 -CH 2 )n of EB block should exist in continuous phase (soft block EB), and therefore it has no relation with disperse phase (hard block S). However, at 48 °C, the correlation intensity peaks at 700 cm -1 [38][39][40] C-H asymmetry stretching, -CH3 2923 37 C-H asymmetry stretching, -CH2-C-H asymmetry stretching of fundamental chain, -CH2-2852 37 C-H symmetry stretching, -CH2-C-H symmetry stretching of fundamental chain, -CH2-1600 37 V9B(B1) framework vibration of the side benzene ring 1594 47 overtone or combination vibration of the side benzene ring 1585 37 V9A(A1) framework vibration of the side benzene ring 1575 47 overtone or combination vibration of the side benzene ring 1568 47 overtone or combination vibration of the side benzene ring 1461 [37][38][39][40] C-H bending, -CH2-1378 [38][39][40] C-H bending, -CH3 1263 [43][44][45][46] vibration of the helical structure in crystals 1195 37 V8A(A1) vibration of the side benzene ring 1157 37 V′15(B1) vibration of the side benzene ring 762 37 dC-H bending vibration of side benzene ring 721 37,41,42 C-H rocking, -CH2-700 37 dC-H bending vibration of side benzene ring and 762 cm -1 assigned to the dC-H bending vibration of the side benzene ring of S block appear simultaneously. It can be speculated that a few of the polystyrene chain segments surround some weak crystalline domain of EB block.…”

Separation of the molecular motion from different components or phases using projection moving-window 2D correlation FTIR spectroscopy for multiphase and multicomponent polymers

“…The projection matrix (or vector) must be determined to extract the molecular motion of CH 2 groups of the ethylene units. According to the literature, 45,[48][49][50][51][52] the bands at 1462, 1453, and 720 cm À1 are attributed to CH 2 in 1630 cm À1 to 630 cm À1 region. The bands at 1462 and 1453 cm À1 , which still show serious overlapping, are attributed to the CH 2 bending vibrations.…”

“…The bands at 1462 and 1453 cm À1 , which still show serious overlapping, are attributed to the CH 2 bending vibrations. [48][49][50][51] These two bands are actually the corresponding bending vibration of 2925 and 2856 cm À1 . Therefore, they cannot be used as the projection matrix (or vector).…”