Structural analysis of hyperbranched polyhydrocarbon synthesized by electrochemical polymerization

Abstract

We describe a structural analysis method for hyperbranched polyhydrocarbon (PHC) produced by electrochemical polymerization. NMR techniques including 1H-NMR, quantitative 13C-NMR, DEPT 13C-NMR, and 1H-13C HSQC 2D NMR along with elemental...

Continuous production of hyperbranched polyhydrocarbons by electrochemical polymerization of chlorinated methanes

“…The number of methine groups assigned by peaks with different chemical shifts is a key to determine the degree of branching in the PHCs, so we focused on them. 18 The methine peaks of PHC-CH 2 Cl 2 in Fig. S4a† were different from PHC-CHCl 3 while the peak positions of methyl and methylene groups were identical except for one methyl group with peak at 29.7 ppm of PHC-CHCl 3 .…”

“…Note that PHC-CCl 4 had two additional methine groups at ( 1 H: 1.30 ppm and 13 C: 22.6 ppm) and ( 1 H: 1.26 ppm and 13 C: 31.57 ppm), which were caused by a larger number of adjacent methine groups. 18 Thus, the number of methine groups increased in the order PHC-CH 2 Cl 2 , PHC-CHCl 3 , and PHC-CCl 4 . (This is consistent with an increase of the degree of branching depending on increasing the number of reactive sites in the monomer.)…”

“…, different lengths of methylene groups and the number of adjacent methine groups. 17 c ,18 E.g. , the methyl group assigned at 0.86 ppm and 0.89 ppm in the 1 H NMR spectrum can be analyzed as the terminal group of a short-chain branch (SCB), and of a long-chain branch (LCB), respectively.…”

An Integrated Plasma–Photocatalytic System for Upcycling of Polyolefin Plastics

“…PE mainly consists of hydrocarbon chains and branches, thus its FTIR spectrum showed vibrations of CÀ H stretching in the range of 3100 cm À 1 to 2700 cm À 1 , CÀ H bending at 1465 cm À 1 and rocking mode of the methylene group at 720 cm À 1 . [42] After plasma treatment, absorption peaks assigned to oxygenated groups significantly enhanced. The peaks at 3440 cm À 1 and 1260 cm À 1 increased with the extension of plasma treatment time, which was attributed to the À OH stretching and CÀ O stretching vibrations, respectively (Figure S2a).…”

“…FTIR was used to analyze the variations in the functional groups of PE surface during plasma treatment (Figure 2a). PE mainly consists of hydrocarbon chains and branches, thus its FTIR spectrum showed vibrations of C−H stretching in the range of 3100 cm −1 to 2700 cm −1 , C−H bending at 1465 cm −1 and rocking mode of the methylene group at 720 cm −1 [42] . After plasma treatment, absorption peaks assigned to oxygenated groups significantly enhanced.…”