http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
고속전단에 의한 폴리카보네이트/ABS 블렌드의 열분해 및 기계적 특성 연구
유재정(Jae Jung Yoo),용다경(Da Kyoung Yong),이한기(Han Ki Lee),김대식(Dae Sik Kim),이형일(Hyung Il Lee),김선홍(Sun Hong Kim),이기윤(Kee Yoon Lee),이승구(Seung Goo Lee) 한국고분자학회 2014 폴리머 Vol.38 No.4
Polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) 블렌드를 고속전단압축성형기로 1000rpm 이상의 소크류 속도로 압출하여 전단속도와 전단시간에 따른 PC/ABS 블렌드의 열분해와 기계적 특성을 조사하였다. 고속전단조건으로 스크류 회전속도를 1000에서 3000rpm 범위에서 조절하였고, 전단부하시간은 10에서 40초로 변화를 주었다. 그 결과, 2000 rpm 이상의 고속전단을 통해 얻어진 시편의 경우, 고분자의 열분해의 발생으로 열분해 시작 온도가 낮아졌다. 스크류 회전속도와 전단부하시간에 따라 열분해에 의하여 시편의 인장강도와 신율이 낮아지는 결과를 얻었다. 이러한 PC/ABS 블렌드의 고속전단 조건에 따라 기계적 특성이 크게 변화하였으며 특히, 신율이 고속전단에 크게 영향을 받았다. Polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS) blends were prepared using a high shear extruder to investigate thermal decomposition and mechanical properties with shear rate and shear time. In this experiment, high shear rate, from 1000 to 3000 rpm, in blending process was applied for 10to 40 sec, respectively. At high shear rate over than 2000 rpm, the initial decomposition temperature was dropped significantly compared to a com-pounded sample because of thermal decomposition of the blend by high shear. Consequently, high shear processing gave an important effect on the mechanical and thermal properties of the PC/ABS blend In particular, elongation of the blend decreased significantly with shear rate.
PC/ABS 블렌드의 고속전단성형에 따른 모폴로지 변화에 관한 연구
이동욱 ( Dong Uk Lee ),용다경 ( Da Kyoung Yong ),이한기 ( Han Ki Lee ),최석진 ( Seok Jin Choi ),유재정 ( Jae Jung Yoo ),이형일 ( Hyung Il Lee ),김선홍 ( Seon Hong Kim ),이기윤 ( Kee Yoon Lee ),이승구 ( Seung Goo Lee ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.3
The PC/ABS blends were manufactured with high shear rate processing. Changes of the blend morphologywere analyzed according to the screw speed and processing time. To find optimal conditions of the high shear rateprocessing of the PC/ABS blend, blend morphology and size of the dispersed phase, ABS, were observed with a SEM. Also, tensile properties of the PC/ABS blends were measured to investigate the effect of the high shear rate process withthe screw speed of 500 rpm to 3000 rpm for processing times of 10s to 40s. Especially, to observe the dispersed phase ofthe PC/ABS blend clearly, fracture surfaces of the PC/ABS blend were etched with chromic acid solution. As screw speed and processing time increase, dispersed phase size of the PC/ABS blend decreases and mechanical properties of theblend decrease as well. Especially, at screw speed over than 1000 rpm of high shear rate processing, mechanical propertiesof the PC/ABS blends decrease drastically due to the degradation of the blend during the high shear rate processing. Consequently, the optimal condition of screw speed of the high shear processing of the PC/ABS blend is set at 1000rpm,in this study. Under optimal condition, the PC/ABS blend has relatively high mechanical properties with the relativelystable micro-structure having nanometer scale dispersed phase.
고속 전단 가공에서 페놀계와 인산계 산화방지제에 의한 PC/ABS 블렌드의 물성 변화 연구
이한기 ( Han Ki Lee ),김선홍 ( Seon Hong Kim ),이형일 ( Hyung Il Lee ),유재정 ( Jae Jung Yoo ),용다경 ( Da Kyoung Yong ),최석진 ( Seok Jin Choi ),이승구 ( Seung Goo Lee ),이기윤 ( Kee Yoon Lee ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.2
The effects of antioxidants on the properties of Polycarbonate/Acrylonitrile-Butadiene-Styrene(PC/ABS)blends were studied for the functions of the screw speed and loaded duration of high shear rate processing in order to investigate the degradation for PC/ABS blends. Tris-(2,4-di-tert-butyl-phenyl phosphate) (A1) and Bis(2,4-dicumylphenyl) pentaerythritol diphosphite (A3) as phosphite antioxidants and Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate(A2) as a phenolic antioxidant are used. The thermal properties were detected by TGA and severely decreased, after the processing. The stress-induced and thermal degradation for PC/ABS blends with the antioxidant A3 was retarded better than the others. By using UTM, the mechanical properties also showed individually decreased according to the antioxidants, after the processing, especially, the elongations showed considerable decline behaviors, while the tensile strengths of PC/ABS blends changed very little. For example, in the operating conditions of 1000rpm of screw speed and 20 seconds of loaded period, the elongations decreased from 148% before the processing, to 91.6% with the A1, to63% with the A2 and to 131% with the A3 after the processing, respectively. In order to get the morphological properties, the size distributions of the dispersed phases for PC/ABS were investigated by SEM analysis and tended to decrease, as the screw speed and loaded period of the processing increased. Therefore, we confirmed that the antioxidantA3 was the best of all of three to inhibit the stress-induced degradation of PC/ABS blends during the high shear rate processing.