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RISS 인기검색어
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- 저자 : lhan Özen (검색결과 3 건)
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Morphological similarity of a tri-block copolymer processed at ambient and elevated temperatures
Sebnem Inceoglu,Taner Aytun,Yusuf Z. Mencelo lu,lhan Özen,Metin H. Acar 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.4
We investigated the effect of temperature on the morphology of a tri-block copolymer (BCP) processed in a capillary rheometer. The material used was a polystyrene-b-poly(2-ethylhexyl acrylate)-b-polystyrene (PS-b-PEHA-b-PS) tri-block copolymer, which was synthesized by ATRP with a molecular weight of 38.5 K consisting of 49 molar % PEHA. According to the rheological data obtained with dynamic viscoelastic oscillatory measurements, order-disorder temperature (ODT) of the BCP was measured at around 110oC. Considering this observation, the samples were studied under different temperatures and pressures (from 110°C to 28°C and from 48 to 75 bar) in capillary rheometer. All processed materials were characterized by using differential scanning calorimetry (DSC) and atomic force microscopy (AFM). It was found that all samples processed by aid of either temperature or pressure showed similar mixed morphologies (a mixture of the ordered and disordered structures i.e., the reduction of microphase separation due to processing).
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İlhan Özen,Claude Rustal,Klaus Dirnberger,Hans-Gerhard Fritz,Claus Dieter Eisenbach 한국유변학회 2011 Korea-Australia rheology journal Vol.23 No.1
In this study, we prepared polypropylene (PP) blends with commercially available amphiphilic diblock copolymer poly(ethylene-block-ethylene oxide) (P(E-b-EO)). Selective surface enrichment of the diblock copolymer used was observed only on the PP blend extrudates which were prepared using capillary rheometer with different wall shear rates showing that flow processes play an enormous role in surface migration.
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Celal Söylemez,İlker Türkmen,İlhan Özen 한국고분자학회 2020 Macromolecular Research Vol.28 No.12
This study was aimed at providing both water vapor permeability and hydrogen sulfide adsorption properties in polyethylene (PE) stretched films by using different amounts of natural zeolites. Firstly, zeolite was coated with 1%, 5%, and 7% stearic acid in a high shear mixer. Cup test, Fourier transform infrared (FTIR) spectroscopy, and ash-oven analyses showed that a succesful coating was achieved. According to the Brunauer, Emmett and Teller (BET) gas adsorption and inductively coupled plasma mass spectrometer (ICP-MS) analyses, surface treatment with stearic acid didn’t change the particle size of the zeolite but lowered its hydrogen sulfide (H2S) adsorption capacity from 38.84±5.22 ppm/g sample (uncoated zeolite) to 17.26±2.54 ppm/g sample (7% coated zeolite). PE/zeolite (80/20 and 60/40 w/w) blown films were generated by using uncoated and 1%, 5%, and 7% stearic acid coated zeolites and then stretched. It was observed that the stearic acid coating of zeolite greatly improved the compatibility between polyethylene and zeolite resulting in films without pinholes generation after stretching (especially the 7% coated zeolite containing PE/zeolite (60/40 w/w) film). The usage of coated zeolite also improved mechanical properties by increasing the tensile strength and decreasing the elongation at break values. It was revealed that a loading amount of 40 wt% coated zeolite was necessary for achieving a sufficient breathability (658±4 and 1040±3 g/m2/day for 5% and 7% coated zeolite containing films, respectively). Odor removal capacity of the PE/zeolite (60/40 w/w) films was improved by 165% and 244% for the 5% and 7% coated zeolite containing samples, respectively.
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