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7 How Do Orientation Fluctuations Evolve to Crystals ?
| Content Provider | Semantic Scholar |
|---|---|
| Author | Xiao, Zhi-Cheng Ilavsky, Jan Long, Gabrielle G. Akpalu, Yvonne A. |
| Abstract | Light and synchrotron X-ray scattering are used to probe structure formation during isothermal crystallization of an ethylene-1-hexene copolymer (EH064, Mw = 70,000 g/mol, ρ = 0.900 g/cm , Mw/Mn ∼ 2, 6.4 mole percent hexene) and an ethylene-1-butene copolymer (EB059, Mw = 70,000 g/mol, ρ = 0.905 g/cm , Mw/Mn ∼ 2, 5.9 mole percent butene). It is shown that clear structural information on size scales ranging from tens of nanometers to several micrometers during early stage crystallization can be obtained by the combined use of small-angle light scattering (SALS) and (USAXS) when crystallizing the polyethylenes at high temperatures (above the peak melting temperature of the polymer and below the theoretical equilibrium melting temperature) required for resolving early stage crystallization without the influence of the crystal growth. Fractal objects with diffuse interfaces are formed initially, where the limiting slope of the scattering profiles increases from around 2 to 4 during early stage crystallization. This indicates that the interfaces of these domains sharpen with time. The interface sharpening process depends on the crystallization temperature and the molecular structure of the polymers. The magnitude of the limiting slope in log-log plots of USAXS scattering profiles decreases again as the spherulites are formed and then grow, showing the effect of temperature and molecular structure on the early stage crystallization of polymers. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://page-one.springer.com/pdf/preview/10.1007/3-540-47307-6_7 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
