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چاپ مقاله در مجله Chemical Engineering Journal با ضریب تأثیر 10.652 توسط پژوهشگران دانشکده مهندسی پلیمر

 تاريخ: 22/09/99

ضمن عرض تبریک به تمای اعضای خانواده دانشکده مهندسی پلیمر، به اطلاع می رساند مقاله فوق حاصل نتایج دوره کارشناسي ارشد خانم مهندس زينب تاجمرادي است که اخیرا از دانشکده مهندسی پلیمر فارغ التحصیل شده و در همين دانشکده مشغول ادامه تحصيل در دوره دکترا هستند.

مشخصات مقاله:

Z. Tajmoradi, H. Roghani-Mamaqani, M. Salami-Kalajahi, Cellulose nanocrystal-grafted multi-responsive copolymers containing cleavable o-nitrobenzyl ester units for stimuli-stabilization of oil-in-water droplets, Chemical Engineering Journal, 2020, 128005
https://doi.org/10.1016/j.cej.2020.128005

Abstract

Hybrid smart surfactants are highly applicable in stabilization of oil-in-water droplets and also Pickering polymerizations. Temperature-, photo-, and pH-responsive cellulose nanocrystal (CNC)-grafted copolymers of N,N′-dimethylaminoethyl methacrylate (DMAEMA) and o-nitrobenzyl acrylate (NBA) were synthesized in different molar ratio of NBA to DMAEMA via surface-initiated reversible addition-fragmentation chain transfer polymerization. Temperature-, pH-, and light-responsivity of the CNC-grafted polymers were evaluated by Fourier-transform infrared spectroscopy, dynamic light scattering (DLS), zeta potential, and ultraviolet-visible (UV-vis) spectroscopy. Critical flocculation temperature (CFT) of the CNC-grafted polymers was decreased by increasing pH and length of the PNBA block. Photo-cleavage mechanism and kinetics of the o-nitrobenzyl ester groups upon UV light irradiation were experimentally investigated in solutions with different pH values using UV-vis spectroscopy. The CNC-grafted polymers were used to stabilize n-hexane droplets in water and also prepare polystyrene latex by Pickering polymerization before and after exposure to UV light, respectively. Stability of the n-hexane-in-water suspensions was investigated as a function of light irradiation, temperature, pH, and CO2 by optical microscopy and DLS. The scanning electron microscopy and transmission electron microscopy images showed spherical morphology of the colloidal polystyrene latex samples with particle size in the range of 500-600 nm. Consequently, these hybrid smart surfactants could be highly applicable in the preparation of colloidal polymer particles and oil-in water droplets with switchable stability upon different stimuli.



 امکانات
     

 
درج در سايت توسط : IT
       
 
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دانشگاه صنعتی سهند ، دانشکده مهندسی پلیمر- صندوق پستی: 1996-51335 | دفتر دانشکده مهندسی پلیمر: 04133459091 | polymer@sut.ac.ir