Melt reactivity of carboxylic acid functional polysulfone in polyamide/polysulfone blends: phase morphology and mechanical properties aspects

Maréchal, Ph.; Chiba, Tsuneo; Inoue, Takashi; Weber, Martin; Koch, Eckhard

doi:10.1016/s0032-3861(97)10342-1

Cited by 13 publications

(8 citation statements)

References 21 publications

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“…The resultant uncompatibilized polymer blends from the MiniMAX showed a poor dispersion as compared to those prepared from the extruder and the batch mixer 12. The mixing efficiency can be improved by introducing some elongational flow by periodically lifting the rotor12–14 or adding three steel balls to the MiniMAX 13. However, it may be hard to reproduce the mixing conditions when lifting the rotor up and down, and it is difficult to remove the small amount of samples in the presence of the balls 14…”

Section: Introductionmentioning

confidence: 99%

Melt Mixing of Polycarbonate with Multi‐Walled Carbon Nanotubes in Miniature Mixers

Lin

Sundararaj

Pötschke

2006

Macro Materials & Eng

115

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Summary: MWNT mixtures with PC were prepared in three different miniature mixers at 265 °C and 50 rpm for 6 min by the master batch dilution method. One mixer is a 4.5 cm3 DACA microcompounder (DACA Instruments) consisting of two conical co‐rotating screws with a bypass, allowing the material to circulate for defined periods. The other two miniature mixers are custom‐built in our lab: the 2.2 cm3 APAM and the 3 cm3 MBM. The volume resistivity for the nanocomposites obtained from the APAM and the MBM showed a similar trend for different MWNT compositions. The electrical percolation concentration for the nanocomposites prepared in the APAM and the MBM is between 0.50 wt.‐% (or 0.34 vol.‐%) and 0.75 wt.‐% (or 0.52 vol.‐%) MWNT, and it is between 0.75 wt.‐% (or 0.52 vol.‐%) and 1.00 wt.‐% (or 0.69 vol.‐%) for the DACA microcompounder. Rheological characterization indicates that the microstructure of PC/MWNT composites prepared from the miniature mixers changes at a concentration of 0.38 wt.‐% for the APAM and the MBM and 0.50 wt.‐% for the DACA where an interconnected network is formed. TEM micrographs show that there are some small aggregates in the nanocomposites obtained from the APAM, fewer aggregates from the MBM, and least from the DACA. AFM analysis suggests that the length of nanotubes is reduced from 0.57 µm to 0.38–0.42 µm after they were melt mixed in the three mixers.Effect of MWNT content on volume resistivity of PC/MWNT obtained from different microcompounders.magnified imageEffect of MWNT content on volume resistivity of PC/MWNT obtained from different microcompounders.

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Section: Introductionmentioning

confidence: 99%

Melt Mixing of Polycarbonate with Multi‐Walled Carbon Nanotubes in Miniature Mixers

Lin

Sundararaj

Pötschke

2006

Macro Materials & Eng

115

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“…Reagent grade dicumyl peroxide (DCP), and 2,2'-azobisisobutyronitrile (AIBN) were used without further purification whereas benzoyl peroxide (BPO) was purified by recrystalization in ether. The melt grafting reaction was carried out in a mixer, MINI-MAX MODEL CS 183MM-065, Custom Scientific Instruments Inc. 10 IR spectra were recorded on Nicolet FT-IR.…”

Section: Methodsmentioning

confidence: 99%

Melt-Grafting of Maleimides Having Hindered Phenol Group onto Polypropylene

2003

Bulletin of the Korean Chemical Society

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Monomeric antioxidant 1 was prepared by the reaction of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol with N-[4-(chlorocarbonyl)phenyl]maleimide in the presence of imidazole. Monomeric antioxidant 2, bearing carbamate group, was synthesized from the reaction of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol and azidomaleimide. Antioxidant 3 was prepared by the reaction of N-(4-hydroxyphenyl)maleimide and 3- (3,5-ditert-butyl-4-hydroxyphenyl) propionic chloride in the presence of triethylamine. These reactive antioxidants were grafted onto polypropylene (PP) by melt-processing with free radical initiators in a mini-max moulder. From the infrared spectra of the grafted PP, it was found that the monomeric antioxidants were grafted onto PP. IR spectroscopic methods were used for the quantitative determination of the extent of grafting of monomeric antioxidant. To optimize the reaction conditions, the influences of the concentration of DCP, monomeric antioxidant, reaction time and temperature on the extent of grafting were studied.

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“…In these blends, phase separation appeared due to the poor compatibility between the two components and the phase interface usually became the weakness for the material resulting in the decrease of responding performances. The addition of PA6 improved the processability of PSU, but PSU/PA6 blends displayed poor properties owing to their unstable morphology and poor interfacial adhesion …”

Section: Introductionmentioning

confidence: 99%

Processability of polysulfone improved by adding polyamide 6 and polysulfone‐polyamide 6 block copolymer

Guo

Lin

Qian

et al. 2014

J of Applied Polymer Sci

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Although polysulfone (PSU) is a potential thermoplastic engineering plastic with high heat resistance, good dimensional stability and excellent mechanical properties, its poor processability has greatly restricted its application in electrical, aerospace, and medical fields. In this work, polyamide 6 (PA6) and PSU‐PA6 block copolymer (PSU‐b‐PA6) were used to improve the processibility and formability of PSU depending on their excellent fluidity and good compatibility between two components. Furthermore, the fluidity, thermal and mechanical properties of the blends were carefully investigated. It was found that, melt flow index of PSU could be increased above 10 times, and strength and toughness could be enhanced by 4–10% with the introduction of 10 wt % PA6 and PSU‐b‐PA6 without compromising the heat resistance of PSU obviously. The processing conditions of PSU could be improved while maintaining a decent comprehensive performance. Thus, the method has great potential for extending the applications of PSU. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41139.

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Melt reactivity of carboxylic acid functional polysulfone in polyamide/polysulfone blends: phase morphology and mechanical properties aspects

Cited by 13 publications

References 21 publications

Melt Mixing of Polycarbonate with Multi‐Walled Carbon Nanotubes in Miniature Mixers

Melt Mixing of Polycarbonate with Multi‐Walled Carbon Nanotubes in Miniature Mixers

Melt-Grafting of Maleimides Having Hindered Phenol Group onto Polypropylene

Processability of polysulfone improved by adding polyamide 6 and polysulfone‐polyamide 6 block copolymer

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