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Solution and melt 13C NMR has been established as a useful tool for a quantitative determination of branch content of short- and long-chain branched polyethylenes while XRD can reveal important information on the morphology, structure and the degree of crystallinity of polythene [6, 7, 8].
Raman images of the same samples are uniform when constructed by branch content.
Note that the components of one system differ in both branch type and branch content; those of another, in branch content but not branch type; and those of the third in branch type only.
The results indicated that at a given temperature, the global orientation order parameter decreased almost linearly with increasing branch content up to a value of approximately 38.5 and increased considerably and unexpectedly at a branch content of 47.6.
With increasing branch content and molecular weight the intermediate phase becomes more similar to the structure of amorphous phase.
Increasing branch content lowered the percentage crystallinity which resulted in an increase in the importance of interlamellar deformation mechanisms.
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Three series of cross-fractionated branched polyethylenes having molecular weights in the ranges 20 000, 60 000 and 110 000 and branch contents ranging from zero to 32 hexyl branches per 1000 C atoms have been studied.
The order parameter was insensitive to the branch length except at high branch contents.
Simulation of chains with the same molar mass but with different branch contents showed a reduction in the average end-to-end distance with increased branching.
n-Hexane desorption measurements were performed on heterogeneous poly ethylene-co-octene)s with hexyl branch contents between 0.8 and 3.9 mol% and crystallinities between 30 and 60%.
This specific time, in the range from milliseconds to seconds, increases with molecular length, and in linear-low-density polymer, for higher branch contents.
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