Carboxylic acid end group modification of poly(butylene terephalate) in supercritical fluids

Gooijer, de Jm Jesse; Scheltus, M; Jansen, Mag Martijn; Koning, CE Cor

doi:10.1016/s0032-3861(03)00072-7

Cited by 8 publications

(7 citation statements)

References 19 publications

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“…Zimmerman and Kim [4] showed the effect of terminal COOH groups' concentration on the hydrolysis kinetics and in particular they demonstrated the autocatalytic mechanism of the hydrolysis, more recently observed also in solid state polymerization of PET [5] and in hydrolysis of poly-(butylene terephthalate) (PBT) [6]. Al-AbdulRazzak and Jabarin [1] studied the effect of temperature and moisture content in the hydrolysis of PET during melt processing.…”

Section: Introductionmentioning

confidence: 95%

“…In some cases the hydrolytic stability of polyesters was improved by reducing the terminal carboxylic acid groups' concentration [1,5,6]. Many evidences were reported in the literature confirming the reversibility of hydrolysis and suggested the possibility of driving it by controlling the concentration of water [7] and the processing parameters [8].…”

Section: Introductionmentioning

confidence: 99%

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Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Coltelli

Bianchi

Aglietto

2007

Polymer

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Coltelli

Bianchi

Aglietto

2007

Polymer

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“…Nevertheless, at higher temperatures, certain accession reactions, including the self-polymerization of the epoxy groups, 39 the formation of styrene carbonate, 40 and the carboxylic-acid end-group modification of PET with the epoxy groups may occur. 26 Thus, the maximum temperature for controlled scCO 2 treatment was set at 120 C in this study. To increase the content of the cross-linking agent absorbed by the PET fabric in scCO 2 , three cosolvents (4% mol/mol), acetone, ethyl acetate and chloroform, were added to CO 2 for impregnation, respectively, at 120 C and 25 MPa for 2 h. Although alcohols are good modifiers which can enhance the swelling of PET fiber in scCO 2 , 24 they cannot be used because epoxy compounds react with alcohols.…”

Section: Supercritical Treatment Of Pet Fabricmentioning

confidence: 99%

“…The higher the crystallinity, the more difficult it is to swell the polymer. 26 The degree of swelling of the polymeric matrix can be modulated by adjusting the pressure and temperature, and the mass transfer of agents within the polymer can also be controlled in the same way. 27 In addition, a cosolvent participating in scCO 2 -polymer processing can also increase the solute uptake in polymer, which attributed mainly to the solubility improvement of solute in scCO 2 .…”

Section: Introductionmentioning

confidence: 99%

A novel method of modifying poly(ethylene terephthalate) fabric using supercritical carbon dioxide

Ma¹,

Zhao²,

Okubayashi³

et al. 2010

J of Applied Polymer Sci

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For the modification of poly(ethylene terephthalate) (PET) fabric, a type of epoxy compound, glycerol polyglycidyl ether (GPE), was impregnated as a cross-linking agent into PET fabric by means of supercritical carbon dioxide (scCO 2 ), then, a series of immobilization processes were implemented, including the pad-drycure process and the solution process to finish the GPE-PET fabric with natural functional agents (sericin, collagen, or chitosan). Chloroform was found to be an effective cosolvent, as evidenced by the mass transfer of GPE to PET during the treatment with scCO 2 . Chemical analyses by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy showed that GPE can penetrate the surface of the PET fabric in scCO 2 pretreatment process, and natural functional agents (sericin, collagen, or chitosan) can also be immobilized on the surface of the GPE-PET fabric especially for the method of pad-drycure. The nitrogen content in the modified PET fabrics was calculated accurately and confirmed by combustion analysis. The modified PET fabric displayed improvements in surface wettability, moisturization efficiency, and antibacterial characteristics against S. aureus, which demonstrated that the feasibility of this design for immobilizing natural functional agents (sericin, collagen, or chitosan) onto the surface of the PET fabric.

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“…The swelling of a polymer occurs only in its amorphous phase, and depends on the interaction of the supercritical fluid with the polymer and on the crystallinity of the polymer. The higher the crystallinity, the more difficult it is to swell the polymer 26. The degree of swelling of the polymeric matrix can be modulated by adjusting the pressure and temperature, and the mass transfer of agents within the polymer can also be controlled in the same way 27.…”

Section: Introductionmentioning

confidence: 99%

Microfabricated multilayer parylene‐C stencils for the generation of patterned dynamic co‐cultures

Jinno

Moeller

Chen

et al. 2008

J Biomedical Materials Res

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Co-culturing different cell types can be useful to engineer a more in vivo-like microenvironment for cells in culture. Recent approaches to generating cellular co-cultures have used microfabrication technologies to regulate the degree of cell-cell contact between different cell types. However, these approaches are often limited to the co-culture of only two cell types in static cultures. The dynamic aspect of cell-cell interaction, however, is a key regulator of many biological processes such as early development, stem cell differentiation, and tissue regeneration. In this study, we describe a micropatterning technique based on microfabricated multilayer parylene-C stencils and demonstrate the potential of parylene-C technology for co-patterning of proteins and cells with the ability to generate a series of at least five temporally controlled patterned co-cultures. We generated dynamic co-cultures of murine embryonic stem cells in culture with various secondary cell types that could be sequentially introduced and removed from the co-cultures. Our studies suggested that dynamic co-cultures generated by using parylene-C stencils may be applicable in studies investigating cellular interactions in controlled microenvironments such as studies of ES cell differentiation, wound healing and development.

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Carboxylic acid end group modification of poly(butylene terephalate) in supercritical fluids

Cited by 8 publications

References 19 publications

Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

Poly(ethylene terephthalate) (PET) degradation during the Zn catalysed transesterification with dibutyl maleate functionalized polyolefins

A novel method of modifying poly(ethylene terephthalate) fabric using supercritical carbon dioxide

Microfabricated multilayer parylene‐C stencils for the generation of patterned dynamic co‐cultures

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