Polyimide and nylon 6 blend film: Preparation, characterization and thermal behavior

Niyogi, Sobhan; Maiti, Sukumar; Adhikari, Basudam

doi:10.1002/pen.10952

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…This increase in density resulted from the presence of some residual lithium chloride in the film matrix. Niyogi et al23 also observed similar behavior for lithium chloride–modified film.…”

Section: Resultsmentioning

confidence: 63%

Separation of phenol–water mixture by membrane pervaporation using polyimide membranes

Pradhan

Sarkar

Niyogi

et al. 2001

J of Applied Polymer Sci

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Separation of components of aqueous waste streams containing organic pollutants is not only industrially very important but also is a challenging process. In this study, separation of a phenol-water mixture was carried out by using a membrane pervaporation technique with indigenously developed polyimide membranes. The membranes were found to permeate water selectively. The total flux as well as that of the individual components were measured. The effect of lithium chloride modification of polyimide film on total flux was investigated. The total flux obtained with 2% lithium chloride modification was about 3.6 times higher than that obtained with virgin membrane. The effects of different parameters such as feed composition and temperature on flux, and separation factor were determined. With modified membrane, a separation factor as high as 18.0 was obtained for water at 27°C and with 8.0 wt % phenol solution.

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Section: Resultsmentioning

confidence: 63%

Separation of phenol–water mixture by membrane pervaporation using polyimide membranes

Pradhan

Sarkar

Niyogi

et al. 2001

J of Applied Polymer Sci

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“…For clarifying the point at issue, elemental analysis is considered to be a useful tool. Because the nitrogen (N) element exists only in the PA6 component in the whole experimental system, after the content of nitrogen element in blend has been determined, the weight percentage of PA6 in the corresponding specimen can be calculated 23…”

Section: Resultsmentioning

confidence: 99%

Preparation and structure study of polypropylene/polyamide‐6 gradient materials

Wen

Hou

et al. 2003

J of Applied Polymer Sci

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A polymeric gradient material was prepared by a specific extruding technique in which the weight ratio of two components, polypropylene (PP) and polyamide-6 (PA6), was changed gradually with the progress of process. This columnar gradient material was formed during a combined extruding and winding operating. The gradient variation of specimens sampled along the radius of columnar gradient material was confirmed and characterized through measurements of DSC melting behavior and elemental analysis. The morphological variation was studied using SEM observation. The results indicate that the content of either polymer shows a monotonous variation along the radius direction. With increasing radius, a gradually decreased percentage of PP was observed, whereas PA6 gradually increased. SEM photographs of the specimens sampled at different radii exhibit that the morphology also evolves gradually with variations in the percentage ratio of two polymers. A phase-inversion phenomenon was recognized in this polymeric gradient material and a "dual mode" of dispersed morphology was found in the sandwich zone. These results indicate that the PP/PA6 blend with gradient structure was successfully prepared by use of this unique technique.

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“…The polymer produced was recovered by precipitation in water. The precipitated polymer was filtered, washed with methanol, and followed by vacuum drying 29…”

Section: Methodsmentioning

confidence: 99%

Poly(amic acid)‐Supported Heterogeneous Titanium‐Based Ziegler‐Natta Catalyst for Ethylene Polymerization in a Slurry Process

Kalita¹,

Konwer²,

Dolui³

2012

Adv Polym Technol

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ABSTRACT:The synthesis of a poly(amic acid) (PAA)-supported Ziegler-Natta catalyst (PAA-TiCl 4 ) by the reaction of PAA and titanium tetrachloride (TiCl 4 ) is reported. For ethylene polymerization, three catalysts were synthesized by varying the TiCl 4 /PAA weight ratio in a hexane medium. The resulting catalysts were characterized by Fourier-transformed infrared (FT-IR), ultraviolet (UV), scanning electron microscopy and energy dispersive x-ray detector (SEM-EDX), and x-ray diffraction analysis (XRD). The acidity of the catalysts in an acetone/water solution was measured by a pH meter. Thermogravimetric analysis reveals that catalysts are stable up to 110-125• C. Because of their higher degree of thermal stability, these catalysts may potentially be used as a support in a conventional Ziegler-Natta catalyst for ethylene polymerization. Furthermore, because of the extensive reaction between the functional groups of PAA and TiCl 4 , the chain structure of the PAA was destroyed. The newly synthesized catalysts showed good storability, and the Correspondence to: Swapan K. Dolui;

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Polyimide and nylon 6 blend film: Preparation, characterization and thermal behavior

Cited by 7 publications

References 36 publications

Separation of phenol–water mixture by membrane pervaporation using polyimide membranes

Separation of phenol–water mixture by membrane pervaporation using polyimide membranes

Preparation and structure study of polypropylene/polyamide‐6 gradient materials

Poly(amic acid)‐Supported Heterogeneous Titanium‐Based Ziegler‐Natta Catalyst for Ethylene Polymerization in a Slurry Process

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