Long-Chain Branch Measurement in Substantially Linear Ethylene Polymers by 13C NMR with Halogenated Naphthalenes as Solvents
| Autor: | Sukrit Mukhopadhyay, Philip P. Fontaine, Matthew Miller, Dan Baugh, Zhe Zhou, Bill Winniford, Zhi Shi, Yiyong He, Rongjuan Cong |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Ethylene Polymers Organic Chemistry 02 engineering and technology Polymer Carbon-13 NMR 010402 general chemistry 021001 nanoscience & nanotechnology Branching (polymer chemistry) 01 natural sciences Viscoelasticity 0104 chemical sciences Inorganic Chemistry chemistry Chemical engineering Materials Chemistry Organic chemistry 0210 nano-technology Long chain |
| Zdroj: | Macromolecules. 50:7959-7966 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/acs.macromol.7b01692 |
| Popis: | Substantially linear ethylene polymers (SLEPs) are important commercial products which are used in various applications such as packaging, electrical insulation, toys, pipes, footwear, roofing, automotive, fabrics, and much more. SLEPs can be produced using molecular catalysts which can lead to long chain branching (LCB). The amount of LCB has an influence on viscoelastic properties which affect film production and processing as well as mechanical and optical properties. Thus, it is important to accurately measure LCB content. 13C NMR is one of the methods that have been used to characterize LCB. It is quite challenging to measure LCB with 13C NMR in the presence of short chain branches (SCBs) longer than four carbons due to the overlap of LCB signals with SCB signals. In this paper, we describe the use of halogenated naphthalenes as suitable solvents to separate 13C signals related to LCB from SCB. The new method presented here allows for better quantification of LCB in polymer samples with a diverse arr... |
| Databáze: | OpenAIRE |
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