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Received October 28, 2013
Accepted December 29, 2013
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고속 전단 가공에서 페놀계와 인산계 산화방지제에 의한 PC/ABS 블렌드의 물성 변화 연구
Effects of Phenolic and Phosphite Antioxidants on the properties for PC/ABS Blends during High-Shear-Rate Processing
Han Ki Lee
Seon Hong Kim1
Hyung Il Lee1
Jae Jung Yoo2
Da Kyoung Yong2
Seok Jin Choi3
Seung Goo Lee2
Kee Yoon Lee1†
HYUNDAI MOTOR GROUP 자동차부문 연구개발본부 고분자재료연구팀, 445-706 경기도 화성시 장덕동 772-1 1충남대학교 고분자공학과, 305-764 대전광역시 유성구 대학로 99 2충남대학교 유기소재ㆍ섬유시스템공학과, 305-764 대전광역시 유성구 대학로 99 3(주)현대엔지비 기술개발팀, 151-742 서울특별시 관악구 관악로 599 서울대학교 314동
Department of Polymer Materials Research Team, Automotive Research&Development, Hyundai Motor Group, 772-1 Jangduk-dong, Hwanseong-si, Gyeonnggi-do 445-706, Korea 1Department of Advanced Polymer Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea 2Department of Advanced Organic Materials & Textile System Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 305-764, Korea 3New Technology Development Team, Research & Development Division, Hyundai-ngv, 314 dong, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea
Korean Chemical Engineering Research, April 2014, 52(2), 266-271(6), 10.9713/kcer.2014.52.2.266 Epub 1 April 2014
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Abstract
Polycarbonate/Acrylonitrile-Butadiene-Styrene(PC/ABS) 블렌드의 분해효과를 조사하기 위해 고전단 압출 성형기의 스크류 회전속도와 전단시간의 함수로 PC/ABS의 물성변화에 영향을 미치는 산화방지제의 효과를 연구하였다. 인산계 산화방지제로 Tris-(2,4-di-tert-butyl-phenyl phosphate) (이후 A1로 명명) and Bis(2,4-dicumylphenyl) pentaerythritol diphosphite(이후 A3로 명명)가 사용되었고, 페놀계 산화방지제는 Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate(이후 A2로 명명)가 사용되었다. 열적 물성은 TGA를 통해 측정되었고 고속 전단 가공 후 크게 감소하였다. 산화방지제 A3가 포함된 PC/ABS 블렌드는 다른 산화방지제에 비해 스트레스로 유발된 degradation과, 열적 degradation이 지연되었다. 고속 전단 가공 후 UTM을 사용한 기계적 물성 또한 산화방지제 종류에 따라 각각 감소하였고, 특히, 신율의 경우 크게 감소하는 거동이 나타난 것에 비해 인장강도의 변화는 매우 적었다. 스크류 회전속도 1000 rpm, 전단부하 시간 20초 조건에서의 신율로 예를 들면, 고속 전단 가공하기 전 신율인 148%에서 A1은 91.6%, A2는 63%, A3은 131%로 감소하였다. 형태학적 물성을 알기 위해 SEM을 사용하여 PC/ABS의 분산상을 조사하였고, 스크류 회전속도와 하중이 작용한 기간이 증가함에 따라 그 크기 분포가 감소하였다. 따라서, 세 종류 산화방지제 모두 고속 전단 가공에서 스트레스로 유발되는 PC/ABS 블렌드의 degradation을 억제하고, 그 효과는 A3가 가장 뛰어난 것을 확인하였다.
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-dicumylphe-nyl) 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_x000D_
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, to 63% 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 antioxidant A3 was the best of all of three to inhibit the stress-induced degradation of PC/ABS blends during the high shear rate processing.
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