End group modification of polyamide-6 in supercritical and subcritical fluids

Gooijer, de Jm Jesse; Scheltus, M; Lösch, HW; Staudt, Reiner; Meuldijk, J.; Koning, CE Cor

doi:10.1016/s0896-8446(03)00066-4

Cited by 13 publications

(3 citation statements)

References 27 publications

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“…Grafting of chemicals on the surface of membranes is a valuable modification method. High activity in the hydrogen substitution reaction of carboxylic acid proved that aromatic polyamide chain grafting sites were best possible to appear on these groups (De Gooijer et al 2004a;Liu & Sun 2008). After a high temperature or high reaction time, grafting sites do not exist on the end group of polyamide chains (De Gooijer et al 2004b;Xu et al 2007).…”

Section: Resultsmentioning

confidence: 99%

Enhancing chlorine resistance in polyamide membranes with surface & structure modification strategies

Idrees

Tariq

2021

Water Supply

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Higher efficient reverse osmosis (RO) membrane development is a significant issue due to the payoff among salt rejection and water flux and permissive chlorine attacking and fouling potential. Weak chlorine resistance is a distinctive challenge for composite polyamide thin-film reverse osmosis membranes. A commercial aromatic membrane was modified by grafting nitrogen-doped graphene oxide quantum dots (N-GOQDs) to enhance chlorine resistance, embedding two-dimensional MXene Ti3C2Tx, introducing synthetically reductive thioether units and oxidized graphitic carbon nitride (OGCN). In this work, salt rejection, chlorine resistance, and water flux increased compared to the pristine membrane. Comprehensive arrangement of desalination performance and chlorine resistance achieved by varying time and concentrations of prepared chemicals. For instance, improved chlorine resistance, after 12 hours of grafting time by N-GOQDs dopped membrane was 32.8%, after 6 hours of exposure time by MXene Ti3C2Tx membrane was 27.4%, after 1 hour of exposure time by thioether membrane was 28.1% and after 40 hours of doping time by OGCN membrane was 31.3%. N-GOQDs dopped membrane showed a good chlorine resistant property, but on the other hand, thioether nano units showed other properties more effectively, including water flux, salt rejection, and less reaction time.

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Section: Resultsmentioning

confidence: 99%

Enhancing chlorine resistance in polyamide membranes with surface & structure modification strategies

Idrees

Tariq

2021

Water Supply

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“…The literature extensively reported on reaction mechanisms that occur between the SAH groups or epoxy groups of the silanes with nylon NH 2 groups. − Hence, it is possible that the disappearance of NH/NH 2 signals is due to the consumption of these functional groups via chemical reactions. Scheme c and d show the possible reactions that occurred at the interfaces between the epoxy of γ-GPS with nylon and between the SAH of SAH silane with nylon.…”

Section: Buried Solid/solid Interfacementioning

confidence: 99%

Characterization of Buried Interfaces of Silicone Materials in Situ to Understand Their Fouling-Release, Antifouling, and Adhesion Properties

Labrague,

Gomez,

Chen

2024

Langmuir

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Poly(dimethylsiloxane) (PDMS) has numerous excellent properties and is extensively used as the main component of many silicone products in a variety of research fields and practical applications such as biomedical materials, aviation, construction, electronic devices, and automobiles. Interfacial structures of PDMS and other components in silicone systems are important for such research and applications. It is difficult to probe interfacial molecular structures of buried solid−liquid and solid−solid interfaces of silicone materials due to the lack of appropriate analytical tools. In this feature article, we presented our research on elucidating the molecular structures of PDMS as well as other additives in silicone samples at buried interfaces in situ at the molecular level using a nonlinear optical spectroscopic technique, sum frequency generation (SFG) vibrational spectroscopy. SFG was applied to study various PDMS surfaces in liquid environments to understand their fouling-release and antifouling activities. SFG has also been used to study buried solid−solid interfaces between silicone adhesives and polymers, elucidating the molecular adhesion mechanisms. Our SFG studies provide important knowledge on interfacial structure−function relationships of silicone materials, helping the design and development of silicone materials with improved properties through optimization of silicone interfacial structures.

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“…Furthermore, these groups have been used to increase hydrogen binding and to facilitate chemical bonds between substrates and adhesives. Several works have been published about the introduction of specifi c reactive groups at the surface of polyamide supports in order to reach higher levels of functionalization (Buche ń ska, 1996 ; Marcin č in, 2002 ; Tobiesen and Michielsen, 2002 ;de Gooijer et al ., 2004 ;Saïhi et al ., 2005 ;Blencowe et al ., 2006 ;Jia et al ., 2006 ;Herrera-Alonso et al ., 2006 ;Makhlouf et al ., 2007 ). Recently the covalent attachment of bioactive compounds to functionalize polymer surfaces, including relevant techniques in polymer surface modifi cation such as wet chemical, organosilanization, ionized gas treatments and UV radiation, have been described (Shearer et al ., 2000 ;Goddard and Hotchkiss, 2007 ).…”

Section: Biotransformations Of Polyamide Fi Bresmentioning

confidence: 99%