Complementarity of universal calibration SEC and 13C NMR in determining the branching state of polyethylene

Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology

“…In the spectrum for 10d-(propyl) (Figure C), the resonances belonging to the propyl branch, 14.55, 20.20, and 36.66 ppm, as well as main chain carbons, 34.25, 27.16, 30.49, and 29.99 ppm and the methine carbon (37.70 ppm) indicate that only propyl branches are present, in good agreement with previously reported data on chain-growth polymers obtained by copolymerization of ethylene with 1-pentene. − …”

Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology

“…In the spectrum for 10d-(propyl) (Figure C), the resonances belonging to the propyl branch, 14.55, 20.20, and 36.66 ppm, as well as main chain carbons, 34.25, 27.16, 30.49, and 29.99 ppm and the methine carbon (37.70 ppm) indicate that only propyl branches are present, in good agreement with previously reported data on chain-growth polymers obtained by copolymerization of ethylene with 1-pentene. − …”

Optimisation and Application of Polyolefin Branch Quantification by Melt‐State 13C NMR Spectroscopy

“…[14,15] Commonly, differential scanningcalorimetry (DSC), [13,16] triple-detection gel permeation chromatography (GPC) [17][18][19] and rheology [14,[20][21][22][23][24][25][26][27] are used for branch determination. Although these techniques may be very sensitive to the presence of branching, they only provide qualitative insight into the degree of branching.…”

Nonlinear Ziegler–Natta-Homopolyethylene with Enhanced Crystallinity: Physical and Macromolecular Characteristics

“…Therefore, theoretically, if only LCB is detected, the number of br units should be equal to 1s = 2s = 3s = br . Interestingly, Striegel and Krejsa observed a similar trend when they analyzed LCB in PE. If LCB content is quite low, then the sensitivity of 13 C NMR on the total amount of branching carbon is challenging or rather impossible to detect.…”

Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology

“…In the spectrum for 10d-(propyl) (Figure C), the resonances belonging to the propyl branch, 14.55, 20.20, and 36.66 ppm, as well as main chain carbons, 34.25, 27.16, 30.49, and 29.99 ppm and the methine carbon (37.70 ppm) indicate that only propyl branches are present, in good agreement with previously reported data on chain-growth polymers obtained by copolymerization of ethylene with 1-pentene. − …”

Optimisation and Application of Polyolefin Branch Quantification by Melt‐State 13C NMR Spectroscopy

“…[14,15] Commonly, differential scanningcalorimetry (DSC), [13,16] triple-detection gel permeation chromatography (GPC) [17][18][19] and rheology [14,[20][21][22][23][24][25][26][27] are used for branch determination. Although these techniques may be very sensitive to the presence of branching, they only provide qualitative insight into the degree of branching.…”

Nonlinear Ziegler–Natta-Homopolyethylene with Enhanced Crystallinity: Physical and Macromolecular Characteristics

“…Therefore, theoretically, if only LCB is detected, the number of br units should be equal to 1s = 2s = 3s = br . Interestingly, Striegel and Krejsa observed a similar trend when they analyzed LCB in PE. If LCB content is quite low, then the sensitivity of 13 C NMR on the total amount of branching carbon is challenging or rather impossible to detect.…”

Decreasing the Alkyl Branch Frequency in Precision Polyethylene: Effect of Alkyl Branch Size on Nanoscale Morphology

“…In the spectrum for 10d-(propyl) (Figure C), the resonances belonging to the propyl branch, 14.55, 20.20, and 36.66 ppm, as well as main chain carbons, 34.25, 27.16, 30.49, and 29.99 ppm and the methine carbon (37.70 ppm) indicate that only propyl branches are present, in good agreement with previously reported data on chain-growth polymers obtained by copolymerization of ethylene with 1-pentene. − …”

Optimisation and Application of Polyolefin Branch Quantification by Melt‐State 13C NMR Spectroscopy

“…[14,15] Commonly, differential scanningcalorimetry (DSC), [13,16] triple-detection gel permeation chromatography (GPC) [17][18][19] and rheology [14,[20][21][22][23][24][25][26][27] are used for branch determination. Although these techniques may be very sensitive to the presence of branching, they only provide qualitative insight into the degree of branching.…”

Nonlinear Ziegler–Natta-Homopolyethylene with Enhanced Crystallinity: Physical and Macromolecular Characteristics

“…Therefore, theoretically, if only LCB is detected, the number of br units should be equal to 1s = 2s = 3s = br . Interestingly, Striegel and Krejsa observed a similar trend when they analyzed LCB in PE. If LCB content is quite low, then the sensitivity of 13 C NMR on the total amount of branching carbon is challenging or rather impossible to detect.…”