Method for correcting molecular weight from gel permeation chromatography. II. Long-chain branching correction of low-density polyethylenes

1976 ◽  
Vol 20 (12) ◽  
pp. 3313-3320 ◽  
Author(s):  
Seikou Nakano ◽  
Yukitaka Goto
Keyword(s):  
Molecular Weight ◽  
Gel Permeation Chromatography ◽  
Low Density ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Gel Permeation ◽  
Long Chain

Methods of long chain branching detection in PE by triple-detector gel permeation chromatography

2015 ◽  
Vol 132 (28) ◽  
pp. n/a-n/a ◽  
Author(s):  
Thipphaya Pathaweeisariyakul ◽  
Kanyanut Narkchamnan ◽  
Boonyakeat Thitisuk ◽  
Wallace Yau
Keyword(s):  
Gel Permeation Chromatography ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Gel Permeation ◽  
Long Chain

An alternative method for long chain branching determination by triple-detector gel permeation chromatography

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 122-129 ◽  
Author(s):  
Thipphaya Pathaweeisariyakul ◽  
Kanyanut Narkchamnan ◽  
Boonyakeat Thitisak ◽  
Wonchalerm Rungswang ◽  
Wallace W. Yau
Keyword(s):  
Gel Permeation Chromatography ◽  
Chain Branching ◽  
Long Chain Branching ◽  
Alternative Method ◽  
Gel Permeation ◽  
Long Chain

Long Chain Branching in Natural Hevea Rubber-Determination by Gel Permeation Chromatography

1981 ◽  
Vol 54 (1) ◽  
pp. 34-41 ◽  
Author(s):  
J. L. Angulo-Sanchez ◽  
P. Cabaulero-Mata
Keyword(s):  
Molecular Weight ◽  
Soluble Fraction ◽  
Hydroxylamine Hydrochloride ◽  
Gel Permeation Chromatography ◽  
Branch Points ◽  
Long Chain Branching ◽  
Molecular Weights ◽  
Gel Permeation ◽  
The Relationship ◽  
Long Chain

Abstract The hevea brasiltensis rubber contains, besides the insoluble branched entities, linear and branched molecules in the soluble fraction. The branching characteristics found by analyzing fractions of different molecular weight of rubber coagulated from freshly tapped latex, stabilized with hydroxylamine hydrochloride are: (a) molecules with molecular weights above 6.5×104−1.0×105g/mol (depending on the branch points functionality) are branched and molecules below these limits are linear. (b) The relationship between number of branch points and the logarithm of molecular weight is linear. (c) The branching density is not independent of molecular weight, as has been assumed for several polymers, but it has a maximum. The maximum branching density found in the soluble fraction is between 10.2×10−6 and 31.6×10−6mol/g, which varies little with the molecular weight; it is possible that molecular species with higher values become insoluble. (d) Branching results ˜λ and gel content (36%) of the whole rubber gave a total of 93–98% of branched entities (sol and gel) and 2–7% of linear species.

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