Reactive Compatibilization of Poly(trimethylene terephthalate)/Polypropylene Blends by Polypropylene‐graft‐Maleic Anhydride. Part 2. Crystallization Behavior
- 24 April 2007
- journal article
- research article
- Published by Taylor & Francis Ltd in Journal of Macromolecular Science, Part B
- Vol. 46 (3), 603-615
- https://doi.org/10.1080/00222340701258008
Abstract
The crystallization behavior of uncompatibilized and reactive compatibilized poly(trimethylene terephthalate)/polypropylene (PTT/PP) blends was investigated. In both blends, PTT and PP crystallization rates were accelerated by the presence of each other, especially at low concentrations. When PP content in the uncompatibilized blends was increased to 50–60 wt%, PTT showed fractionated crystallization; a small PTT crystallization exotherm appeared at ∼135°C besides the normal ∼175°C exotherm. Above 70 wt% PP, PTT crystallization exotherms disappeared. In contrast, PP in the blends showed crystallization exotherms at 113–121°C for all compositions. When a maleic anhydride‐grafted PP (PP‐g‐MAH) was added as a reactive compatibilizer, the crystallization temperatures (T c ) of PTT and PP shifted significantly to lower temperatures. The shift of PTT's T c was larger than that of the PP, suggesting that addition of the PP‐g‐MAH had a larger effect on PTT's crystallization than on PP due to reaction between maleic anhydride and PTT. The nonisothermal crystallization kinetics was analyzed by a modified Avrami equation. The results confirmed that PTT's and PP's crystallization was accelerated by the presence of each other and the effect varied with blend compositions. When the PP content increased from 0 to 60 wt%, PTT's Avrami exponent n decreased from 4.35 to 3.01; nucleation changed from a thermal to an athermal mode with three‐dimensional growths. In contrast, when the PTT content increased from 0 to 90 wt% in the blends, changes in PP's n values indicated that nucleation changed from a thermal (0–50 wt% PTT) to athermal (60–70 wt% PTT) mode, and then back to a thermal (80–90 wt% PTT) mode. When PP‐g‐MAH was added as a compatibilizer, the crystallization process shifted considerably to lower temperatures and it took a longer crystallization time to reach a given crystallinity compared to the uncompatibilized blends.Keywords
This publication has 17 references indexed in Scilit:
- Melting behavior and nonisothermal crystallization kinetics of polyamide 6/polyamide 66 molecular composites viain situ polymerizationJournal of Applied Polymer Science, 2005
- Phase behavior and crystallization analysis in binary crystalline blends of syndiotactic polypropylene and ethylene—Propylene random copolymerJournal of Polymer Science Part B: Polymer Physics, 2004
- Reactive blends of polyamide 6 with polyester elastomer using coupling agentsJournal of Applied Polymer Science, 2004
- Fractionated crystallization of dispersed PA6 phase of PP/PP‐g‐MAH/PA6 blendsJournal of Applied Polymer Science, 2004
- Thermal, crystallization, mechanical, and rheological characteristics of poly(trimethylene terephthalate)/poly(ethylene terephthalate) blendsJournal of Polymer Science Part B: Polymer Physics, 2004
- Morphology and nonisothermal crystallization of in situ microfibrillar poly(ethylene terephthalate)/polypropylene blend fabricated through slit‐extrusion, hot‐stretch quenchingJournal of Polymer Science Part B: Polymer Physics, 2003
- Isotactic polypropylene/ethylene-co-propylene blends: Influence of the copolymer microstructure on rheology, morphology, and properties of injection-molded samplesJournal of Applied Polymer Science, 1999
- Crystallization behavior of polypropylene in polypropylene/nylon 6 blendJournal of Applied Polymer Science, 1999
- Small-Angle Scattering Investigations of Poly(.epsilon.-caprolactone)/Polycarbonate Blends. 2. Small-Angle X-ray and Light Scattering Study of Semicrystalline/Semicrystalline and Semicrystalline/Amorphous Blend MorphologiesMacromolecules, 1994
- Critical Analysis of the Phase Behavior of Poly(.epsilon.-caprolactone) (PCL)/Polycarbonate (PC) BlendsMacromolecules, 1994