[논문]Structure and Properties of Syndiotactic Polystyrene Fibers Prepared in High-speed Melt Spinning Process

Hada Yoshiaki; Shikuma Haruo; Ito Hiroshi; Kikutani Takeshi

doi:10.1007/bf02875569

Structure and Properties of Syndiotactic Polystyrene Fibers Prepared in High-speed Melt Spinning Process 원문보기

Fibers and polymers, v.6 no.1, 2005년, pp.19 - 27

Hada Yoshiaki (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology) , Shikuma Haruo (Idemitsu Kosan Co. Ltd.) , Ito Hiroshi (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology) , Kikutani Takeshi (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology)

Abstract ▼ AI-Helper

High-speed melt spinning of syndiotactic polystyrene was carried out using high and low molecular weight polymers, HM s-PS and LM s-PS, at the throughput rates of 3 and 6 g/min. The effect of take-up velocity on the structure and properties of as-spun fibers was investigated. Wide angle X-ray diffraction (WAXD) patterns of the as-spun fibers revealed that the orientation-induced crystallization started to occur at the take-up velocities of 2-3 km/min. The crystal modification was a-form. Birefringence of as-spun fibers showed negative value, and the absolute value of birefringence increased with an increase in the take-up velocity. The cold crystallization temperature analyzed through the differential scanning calorimetry (OSC) decreased with an increase in the take-up velocity in the low speed region, whereas as the melting temperature increased after the on-set of orientation-induced crystallization. It was found that the fiber structure development proceeded from lower take-up velocities when the spinning conditions of higher molecular weight and lower throughput rate were adopted. The highest tensile modulus of 6.5 GPa was obtained for the fibers prepared at the spinning conditions of LM s-PS, 6 g/min and 5 km/min, whereas the highest tensile strength of 160 MPa was obtained for the HM s-PS fibers at the take-up velocity of 2 km/min. Elongation at break of as-spun fibers showed an abrupt increase, which was regarded as the brittle-ductile transition, in the low speed region, and subsequently decreased with an increase in the take-up velocity. There was a universal relation between the thermal and mechanical properties of as-spun fibers and the birefringence of as-spun fibers when the fibers were still amorphous. The orientation-induced crystallization was found to start when the birefringence reached -0.02. After the starting of the orientation-induced crystallization, thermal and mechanical properties of as-spun fibers with similar level of birefringence varied significantly depending on the processing conditions.

주제어

AI 본문요약
AI-Helper

* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.

제안 방법

About 5 mg of the fiber sample, which was cut to small pieces, was measured at a heating rate of 10 K/min and in the temperature range of up to 300 ℃. From the obtained differential scanning calorimetry (DSC) thermograms, the cold crystallization peak temperature (L) and the melting peak temperature (7, )were analyzed. Crystallinity was also analyzed from the heat of fusion which was estimated by subtracting the heat of cold crystallization from the heat of melting.
Measurement of refractive indices parallel and perpendicular to the fiber axis, n/7 and 丄, was carried out for the as-spun fibers using an interference microscope (Carl-Zeiss Jena) equipped with a polarizing filter. Birefringence !느i was calculated from the two refractive indices using the following equation.
In these polymers, high-order structure of products varies widely from completely amorphous to highly crystalline depending on the processing conditions. On the other hand, it is well known that the high-speed melt spinning of these polymers leads to the development of highly oriented and highly crystallized fiber structure [7, 8]- Considering the facts stated above, high-speed melt spinning of s-PS was carried out in this study with the expectation of obtaining well-developed fiber structure.

이론/모형

Wide angle X-ray diffraction (WAXD) patterns of the asspun fibers were obtained using an X-ray generator and a CCD camera (Rigaku Denki). The generator was operated at 50 kV and 40 mA, and Ni-filtered CuKa radiation was used.

참고문헌 (14)

N. Ishihare, T. Seimiya, M. Kuramoto, and M. Uoi, Macromolecules, 19, 2464 (1986)

상세보기
O. Greis, Y. Xu, T. Asano, and J. Petermann, Polymer, 30, 590 (1989)

상세보기
Z. Sun and R. L. Miller, Polymer, 34, 1963 (1993)

상세보기
Y. Chatani, Y. Shimane, T. Ijitsu, and T. Yukinari, Polymer, 34, 1625 (1993)

상세보기
Y. Chatani, Y. Shimane, T. Inagaki, T. Ijitsu, T. Yukinari, and H. Shikuma, Polymer, 34, 1620 (1993)

상세보기
R. J. Yan, A. Ajji, and D. M. Shinozaki, J. Mater. Sci., 34, 2335 (1999)

상세보기
J. Shimizu, N. Okui, and T. Kikutani, 'High-Speed Fiber Spinning', (A. Ziabicki and H. Kawai Eds.), p.429, John Wiley & Sons, New York, 1985
T. Kikutani, K. Wakayama, M. Sato, and A. Takaku, Sen'i Gakkaishi, 48, 549 (1992)

상세보기
A. J. Pasztor, Jr., B. G. Landes, and P. J. Karjala, Thermochimica Acta, 177, 187 (1991)

상세보기
K. Miyata, T. Kikutani, and N. Okui, J. Appl. Polym. Sci., 65, 1415 (1997)

상세보기
M. Takasaki, H. Ito, and T. Kikutani, J. Macromol. Sci., Pt-B, 42, 59 (2003)
T. Kikutani, K. Nakao, W. Takarada, and H. Ito, Polym. Eng. Sci., 39, 2349 (1999)

상세보기
H. Urabe, H. Ito, T. Kikutani, and N. Okui, Seikei-kakou, 12, 729 (2000)
T. Kikutani, 'Encyclopedia of Materials: Science and Technology', p.7280, Elsevier Science Ltd., Amsterdam, 2001

원문 URL 링크

DOI : 10.1007/BF02875569 [무료]
Springer : 저널
AccessON : 저널

*원문 PDF 파일 및 링크정보가 존재하지 않을 경우 KISTI DDS 시스템에서 제공하는 원문복사서비스를 사용할 수 있습니다.

오픈액세스(OA) 유형

GOLD(Hybrid)

저자가 APC(Article Processing Charge)를 지불한 논문에 한하여 자유로운 이용이 가능한, hybrid 저널에 출판된 논문

내보내기 메뉴

내보내기 구분

파일저장
인쇄
메일전송

구성항목

기본정보
상세정보

관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관

저장형식

Text(ASCII format)
Excel format
RefWorks Direct Export
RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley

메일정보

받는사람 (필수): @
보내는사람 (선택): @
제목
내용: KISTI 검색결과 이메일 서비스

안내

총 건의 자료가 검색되었습니다.

다운받으실 자료의 인덱스를 입력하세요. (1-10,000)

검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다.

데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요)

다운로드 파일은 UTF-8 형태로 저장됩니다.
파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오.

Text(ASCII format)
Excel format

표제어: PCR

동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

AI-Helper ※ AI-Helper는 을 사용합니다.

AI-Helper

안녕하세요, AI-Helper입니다. 좌측 "선택된 텍스트"에서 텍스트를 선택하여 요약, 번역, 용어설명을 실행하세요.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.

연합인증