Chain architecture of LDPE as a function of molar mass using size exclusion chromatography and multi-angle laser light scattering (SEC-MALLS)

Polymer ◽  
1998 ◽  
Vol 39 (14) ◽  
pp. 3109-3113 ◽  
Author(s):  
P. Tackx ◽  
J.C.J.F. Tacx
Keyword(s):  
Light Scattering ◽  
Size Exclusion Chromatography ◽  
Molar Mass ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Size Exclusion ◽  
Chain Architecture ◽  
Exclusion Chromatography

scholarly journals Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors

Holzforschung ◽  
2019 ◽  
Vol 73 (4) ◽  
pp. 363-369 ◽  
Author(s):  
Linping Wang ◽  
Yasumitsu Uraki ◽  
Keiichi Koda ◽  
Aori Gele ◽  
Xuesong Zhou ◽  
...  
Keyword(s):  
Light Scattering ◽  
Size Exclusion Chromatography ◽  
Molar Mass ◽  
Laser Light ◽  
Kraft Lignin ◽  
Laser Light Scattering ◽  
Size Exclusion ◽  
Compact Structure ◽  
Exclusion Chromatography

AbstractThe molar mass (MM) and polydispersity indices (PDI) of acetylated hardwood kraft lignin (Ac-HWKL) and Ac-HWKL fractions were measured by size-exclusion chromatography with multi-angle laser light scattering (SEC-MALLS). The detectors worked at LL658 nmand LL785 nm. The MM of Ac-HWKL measured at 785 nm was much smaller than that measured at 658 nm. The number-average (Mn) and weight-average (Mw) molar masses of Ac-HWKL determined at 785 nm were approximately 6.2 and 6.5 times larger, respectively, than the values estimated using a conventional calibration curve created with authentic polystyrene standards in tetrahydrofuran (THF). Based on the Mw of Ac-HWKL fractions, the Mark-Houwink-Sakurada equation for Ac-HWKL was established to be [η]/ml g−1=0.320 M0.24in THF and [η]/ml g−1=0.142 M0.26in dimethyl sulfoxide (DMSO). These results demonstrate that Ac-HWKL has a more compact structure in an organic solvent than polystyrene.

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