Molecular Weight Dependence of Deuterium Exchange on Polyethylene: Direct Measurement and SANS Model
作者： Brian M. Habersberger , Kyle E. Hart , David Gillespie , Tianzi Huang
DOI: 10.1021/ACS.MACROMOL.5B01075
关键词: Polyethylene 、 Chemistry 、 Monte Carlo algorithm 、 Neutron scattering 、 Scattering 、 Random phase approximation 、 Polymer 、 Deuterium 、 Hydrogen–deuterium exchange 、 Analytical chemistry
摘要: Following a hydrogen–deuterium exchange reaction, size-exclusion chromatography with infrared detection (SEC-IR) was used to measure the distribution of deuterium respect molecular weight on polyethylene resin. The SEC-IR method reveals significant heterogeneity in across weight, including fraction high chains that are nearly or completely unlabeled. Small-angle neutron scattering (SANS) performed labeled polymer and an isotopic blend; random phase approximation model prediction for from n-component blend successfully measured SANS data. Additionally, Monte Carlo algorithm fit data distribution, yielding measurement consistent obtained SEC-IR. methods compared literature approaches describing nonideal labeling. These results demonstrate value detailed information about dis...
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