Morphology development during the initial stages of polymer-polymer blending

Scott, Chris

doi:10.1016/0032-3861(95)91554-k

Cited by 262 publications

(154 citation statements)

References 27 publications

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“…1 ( c ) ] . Scott and Macosko 4 proposed a mechanism for the morphologies developed during the initial stages of polymer -polymer blending. The original matrix perse phase is elongated along with the matrix deformation.…”

Section: Mixing Timementioning

confidence: 99%

“…8 Therefore, processing conditions the rheological behavior of each component, the have a stronger effect on the phase morphology interfacial energy, and the processing condithan do blend composition and rheological behavtions. [1][2][3][4] The combination of all these parameters ior of the individual components. 2,6,9,10 during the blend preparation establishes the The processing conditions, besides being decimain aspects of the morphology, such as cocontinsive in establishing the morphology for multiuous or disperse aspects of the phases, geometric phase polymer blends, are also responsible for the arrangement, and dimension of each phase.…”

Section: Introductionmentioning

confidence: 99%

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Effects of processing conditions on the phase morphology of PC/ABS polymer blends

Chaudhry

Hage

Pessan

1998

J. Appl. Polym. Sci.

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ABSTRACT:The phase morphology of PC/ABS blends can be significantly affected by its processing conditions. Blends prepared in a mixing chamber at different conditions show a strong influence of mixing time and temperature on its morphology. The blend morphology changes from a well-dispersed PC phase surrounded by the ABS matrix phase to a cocontinuous morphology with increase in the mixing time. Higher blending temperatures promote changes in the PC/ABS morphology, probably due to thermal degradation. The rotor speed has not shown much influence on the blend phase morphology. The cocontinuous phase morphology of the PC/ABS blends obtained after mixing for 10 min was shown to be unstable as detected by the heat treatment. A melt annealing for a few minutes showed a significant change in the morphology.

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Section: Mixing Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of processing conditions on the phase morphology of PC/ABS polymer blends

Chaudhry

Hage

Pessan

1998

J. Appl. Polym. Sci.

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“…However, the flow field in either a batch mixer or an extruder is complicated, consisting of a combination of the extensional and shear flow fields [6]. In addition, the final morphology is formed in the first 2 min of the mixing in a batch mixer [7] and in the first few seconds of residence time in an extruder [8,9], which is too fast to observe the breakup process. Therefore, several devices in generating a shear flow field are used to study the morphology development in the initial blending stages.…”

Section: Introductionmentioning

confidence: 99%

“…After 2 min and up to 20 min mixing time, very little reduction in the size of the dispersed phase was observed [27]. During the past decade numerous researchers have investigated the morphology development of the polymer blends in a twin-screw extruder [7,9,[28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Morphology development of PC/PE blends during compounding in a twin‐screw extruder

Yin

et al. 2006

Polymer Engineering & Sci

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The morphological development of a polycarbonate/ polyethylene (PC/PE) blend in a twin-screw extruder was studied using a scanning electron microscope (SEM). The effects of extrusion temperature, viscosity ratio (the ratio of the viscosity of the dispersed phase to that of the matrix), and the screw configuration on the morphology of the PC/PE blend during the extrusion were discussed in detail. It was found that the morphology of the dispersed particles and the interfacial adhesion between the dispersed phase and matrix were both influenced by the extrusion temperature. The dispersed phase had a spheroidal shape and a small size during the high temperature processing, and an irregular shape and a large size when it was processed at low temperature. The PC phase with a lower viscosity was easier to disperse and also to coalesce. Therefore, the deformation of the low-viscosity dispersed phase during the processing was more intense than that of the high-viscosity dispersed phase. By comparing the effects of the different screw configurations on the morphology development of the PC/PE blend, it was found that the melting and breaking up of the dispersed phase were mainly affected in the initial blending stages by the number of the kneading blocks. While a kneading block with a 90 degree staggering angle was used, the size of the dispersed particles decreased and the long fibers were shortened, the large particles were drawn by the additional kneading zone. Finally, all of these structures were completely changed to the short fibers. POLYM.

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“…Macosko studied morphology development during the initial stages of polymer-polymer blending, and give the proposed mechanism for initial morphology development [28][29][30]. Favis investigated the effect of mixing time on the morphology development of blends of polypropylene and polycarbonate and concluded that the most significant changes in morphology occurred during the first 2 min of mixing when melting and softening of the materials was also occurring [31].…”

Section: Introductionmentioning

confidence: 99%

Morphology development and size control of poly(trimethylene terephthalate) nanofibers prepared from poly(trimethylene terephthalate)/cellulose acetate butyrate in situ fibrillar composites

Xiao

Sun

2011

J Mater Sci

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Formation of nano-fibrillar composite structures provides an effective method for preparing thermoplastic nanofibers. By mixing two immiscible thermoplastic polymers in a twin screw extruder, poly(trimethylene terephthalate) (PTT) formed nano-fibrillar morphology in cellulose acetate butyrate (CAB) matrix, and then PTT nanofibers were obtained from PTT/CAB in situ fibrillar composites after removing the matrix phase of CAB. Blend ratio, shear rate, and draw ratio were three important parameters in the extrusion process, which could affect the shape and size of nanofibers. By varying the process conditions, average diameter of PTT nanofibers could be controlled in the range of 80-400 nm. Besides this, the mechanism of nano-fibrillar formation in PTT/CAB blends was also studied by collecting samples at different stages in the extruder. The morphology developmental trends of PTT dispersed phase with different blend ratios were nearly the same. From initial to metaphase and later phase development, the PTT dispersed component undergo the formation of sheets, holes, and network structures, then the size reduction and formation of nanofibers.

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Morphology development during the initial stages of polymer-polymer blending

Cited by 262 publications

References 27 publications

Effects of processing conditions on the phase morphology of PC/ABS polymer blends

Effects of processing conditions on the phase morphology of PC/ABS polymer blends

Morphology development of PC/PE blends during compounding in a twin‐screw extruder

Morphology development and size control of poly(trimethylene terephthalate) nanofibers prepared from poly(trimethylene terephthalate)/cellulose acetate butyrate in situ fibrillar composites

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