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Rheological characterization of disp...

Bellair, Robert.

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Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites./
Author:	Bellair, Robert.
Description:	108 p.
Notes:	Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7784.
Contained By:	Dissertation Abstracts International70-12B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3380483
ISBN:	9781109514285

Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites.
Bellair, Robert.

Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites. - 108 p.

Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7784.

Thesis (Ph.D.)--Wayne State University, 2009.

Superior property enhancements in polymer-clay nanocomposites can be achieved if one can significantly enhance the nanoclay dispersion and polymer-clay interactions. Recent studies have shown that nanoclays can be dispersed in polymers using supercritical carbon dioxide (scCO2). However there is need for a better understanding of how changing the clay modifier affects the clay dispersability by scCO2 and the resultant nanocomposite rheology. Polystyrene (PS)/clay nanocomposites prepared with nanoclays covering the range from 'weak' to 'strong' interaction with the polymer have been prepared using solution blending and the supercritical CO 2 method. TEM images and SAXD display an approximate 4 fold reduction in the average tactoid size upon processing nanocomposites with scCO 2, regardless of the clay modifier identity. As much as 3 orders of magnitude improvement in low frequency storage modulus was observed in the highly interacting scCO2 processed nanocomposite with 5wt% nanoclay. It was found that change in rheological reinforcement due to different interactions is not significant unless the clay dispersion is at or near the theoretical percolation threshold. Once the clay tactoids are close enough to interact through the polymer medium, the interaction strength becomes the dominant force driving rheological improvement.

ISBN: 9781109514285Subjects--Topical Terms:

1018531
Engineering, Chemical.

Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites.
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020 $a 9781109514285
035 $a (UMI)AAI3380483
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100 1 $a Bellair, Robert. $3 1669565
245 1 0 $a Rheological characterization of dispersion and interaction effects in supercritical carbon dioxide processed polymer-clay nanocomposites.
300 $a 108 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-12, Section: B, page: 7784.
500 $a Adviser: Rangaramanujam M. Kannan.
502 $a Thesis (Ph.D.)--Wayne State University, 2009.
520 $a Superior property enhancements in polymer-clay nanocomposites can be achieved if one can significantly enhance the nanoclay dispersion and polymer-clay interactions. Recent studies have shown that nanoclays can be dispersed in polymers using supercritical carbon dioxide (scCO2). However there is need for a better understanding of how changing the clay modifier affects the clay dispersability by scCO2 and the resultant nanocomposite rheology. Polystyrene (PS)/clay nanocomposites prepared with nanoclays covering the range from 'weak' to 'strong' interaction with the polymer have been prepared using solution blending and the supercritical CO 2 method. TEM images and SAXD display an approximate 4 fold reduction in the average tactoid size upon processing nanocomposites with scCO 2, regardless of the clay modifier identity. As much as 3 orders of magnitude improvement in low frequency storage modulus was observed in the highly interacting scCO2 processed nanocomposite with 5wt% nanoclay. It was found that change in rheological reinforcement due to different interactions is not significant unless the clay dispersion is at or near the theoretical percolation threshold. Once the clay tactoids are close enough to interact through the polymer medium, the interaction strength becomes the dominant force driving rheological improvement.
520 $a Solution blending was determined to have an irreversible ordering effect on clays, resulting in nanocomposites that do not show dispersion improvements when reprocessed. DTG of clays separated from nanocomposites shows that during processing a rearrangement of the free modifier not intercalated in the clay galleries occurs. Combined with the significant level of platelet order observed in WAXD and TEM, this leads to the conclusion that the platelets adopt a highly ordered, thermodynamically favorable state after processing. The thermodynamic barriers to dispersion are then great enough that they apparently cannot be overcome with the scCO2 processing method.
520 $a The rheological and mechanical properties of SBS thermoplastic elastomer nanocomposites prepared with solution and scCO2 were investigated. A 300% improvement in Young's modulus was observed which is significantly higher than what is currently found in literature. A reduction in the tensile strength was theorized to come from the high level of ordering seen in TEM that occurs due to microphase separation.
590 $a School code: 0254.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Plastics Technology. $3 1023683
690 $a 0542
690 $a 0794
690 $a 0795
710 2 $a Wayne State University. $b Materials Science and Engineering. $3 1028903
773 0 $t Dissertation Abstracts International $g 70-12B.
790 1 0 $a Kannan, Rangaramanujam M., $e advisor
790 1 0 $a Mao, Guangzhao $e committee member
790 1 0 $a Manke, Charles $e committee member
790 1 0 $a Newaz, Golam $e committee member
790 $a 0254
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3380483