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Solution crystallization and dissolution of polyolefins as monitored by a unique analytical tool: solution
Analytical Chemistry
|July 9, 2013
Summary
Solution crystallization analysis by laser light scattering (SCALLS) reveals solvent effects on polyolefin crystallization and dissolution. Different solvents influence cocrystallization and codissolution behaviors of polyethylene and polypropylene blends.
Area of Science:
- Polymer Science
- Materials Chemistry
Background:
- Investigated solution crystallization and dissolution of polyolefins using Solution Crystallization Analysis by Laser Light Scattering (SCALLS).
- Examined the influence of various solvents on the behavior of linear polyethylene (PE) and isotactic polypropylene (iPP).
Discussion:
- SCALLS results demonstrate significant solvent-dependent crystallization and dissolution for PE and iPP.
- Cocrystallization effects were minimal in TCB and o-DCB but pronounced in xylene and decalin for PE/iPP blends.
- Observed bimodal dissolution curves for PE and iPP in xylene, indicating minimal codissolution, contrasting with simultaneous dissolution in TCB, o-DCB, and decalin.
Key Insights:
- Solvent choice critically impacts polyolefin cocrystallization and codissolution.
- Xylene promotes distinct dissolution behaviors for PE and iPP, while TCB, o-DCB, and decalin lead to simultaneous dissolution.
- Findings offer insights into solvent effects for preparative fractionation techniques like prep TREF.
Outlook:
- Novel approach to understand solvent-mediated interactions in polymer blends.
- Potential for optimizing solvent systems in polymer fractionation and processing.
- Facilitates tailored control over cocrystallization and codissolution for material separation.
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