분자량 및 유변 특성에 따른 단일 중합체 폴리프로필렌의 발포체 변화：(1) 회분식 공정

홍다윗; 윤광중; 이기윤; David Hong; Kwang Jung Yoon; Kee Yoon Lee

Polymer(Korea), Vol.26, No.1, 61-70, January, 2002

Structural Changes of Homopolymer Polypropylene Foam with Molecular Weights and Rheological Properties：(1) In Batch Process

홍다윗, 윤광중, 이기윤^†

충남대학교 공과대학 고분자공학과

David Hong, Kwang Jung Yoon, and Kee Yoon Lee^†

Department of Polymer Science and Engineering, Chungnam National University, Taejeon Chungnam 305-764, Korea

E-mail:

초록

단일 중합체 폴리프로필렌(PP) 수지가 가지는 분자량 특성과 유변 특성이, 회분식 가교 발포 공정을 통해 생산된 발포체 구조 변화에 미치는 영향을 연구하였다. 또한, 전자선 조사 가교가 PP 발포체에 미치는 영향도 연구하였다. 분자량 증가에 따른 저장 모듈러스(G '), 손실 모듈러스(G "), 제로 전단 점도(η0) 및 완화시간(λ) 등의 유변 물성 값은 증가하였고, 이러한 유변 물성의 증가는 발포체 구조의 안정성에 직접적인 영향을 미쳤다. 전자선 조사량에 따른 PP의 겔분율은 3.2 Mrad의 전자선 조사량에서 크게 증가하며, 발포체의 안정성을 크게 향상시켰고, 그 이상의 전자선 조사량에서는 겔분율은 다시 감소하였고, 발포체 구조 또한 불안정해졌다.

The effects of molecular weights and rheological properties of polypropylene (PP), on its foam structures in batch process were investigated. The effects of crosslinking process were also considered in this study. The rheological properties of polypropylene, such as storage modulus(G '), loss modulus(G "), zero shear viscosity(η0), and relaxation time(λ), increased with the increase of molecular weights, and these increases in rheological properties directly affected the stability improvements of the PP foam. The increase of crosslinked PP's gel content stopped at the irradiation dose of 3.2 Mrad. The development of foam structures was more enhanced as the irradiation dose increased up to 3.2 Mrad. When the irradiation dose exceeded 3.2 Mrad, however, it negatively affected the structural development of the foam by diminishing gel contents of the foaming material, which resulted in instability of the foam structure.

Keywords:polypropylene;foam;irradiation crosslinking;molecular weight

[References]

Colton JS, Mater. Manuf. Process., 4(2), 253 (1989)
Nojiri A, Sawasaki T, Koreeda T, U.S. Patent, 4,424,293 (1984)
Lee YD, Wang LF, J. Appl. Polym. Sci., 32, 4639 (1986)
Nojiri A, Sawazaki T, Konishi T, Kudo S, Onobori S, Furukawa Rev., 2, 34 (1982)
Nojiri A, Sawasaki T, Radiat. Phys. Chem., 26(3), 339 (1985)
Uejyukkoku N, Nakutsu Y, U.S. Patent, 5,786,406 (1998)
Park JJ, Katz L, Gaylord NG, U.S. Patent, 5,116,881 (1992)
Bradley MB, Phillips EM, SPE ANTEC Tech. Papers, 36, 717 (1990)
Macosko CW, "Rheology: Principles, Measurements, and Applications," p. 117, Wiley, John & Sons, 1994 (1994)
Dealy JM, Wissbrun KF, "Melt Rheology and Its Role in Plastics Processing," p. 60, Chapman & Hall, New York (1989)
Lide DR, "CRC Handbook of Chemistry and Physics," 74th ed., CRC Press, Florida, 1994 (1994)
Goel SK, Beckman EJ, Polym. Eng. Sci., 34, 14 (1994)
Matuana-Malanda L, Park CB, Balatinecz JJ, SPE ANTEC Tech. Papers, 41, 2394 (1995)
Kumar V, Suh NP, Polym. Eng. Sci., 30, 20 (1990)
Mark HF, Bikales NM, Overberger CG, Menges G, "Encyclopedia of Polymer Science and Engineering," 2nd ed., vol. 4, p. 431, John Wiley & Sons, New York, 1985 (1985)

[Referenced By]

[1] Colton JS, Mater. Manuf. Process., 4(2), 253 (1989)

[2] Nojiri A, Sawasaki T, Koreeda T, U.S. Patent, 4,424,293 (1984)

[3] Lee YD, Wang LF, J. Appl. Polym. Sci., 32, 4639 (1986)

[4] Nojiri A, Sawazaki T, Konishi T, Kudo S, Onobori S, Furukawa Rev., 2, 34 (1982)

[5] Nojiri A, Sawasaki T, Radiat. Phys. Chem., 26(3), 339 (1985)

[6] Uejyukkoku N, Nakutsu Y, U.S. Patent, 5,786,406 (1998)

[7] Park JJ, Katz L, Gaylord NG, U.S. Patent, 5,116,881 (1992)

[8] Bradley MB, Phillips EM, SPE ANTEC Tech. Papers, 36, 717 (1990)

[9] Macosko CW, "Rheology: Principles, Measurements, and Applications," p. 117, Wiley, John & Sons, 1994 (1994)

[10] Dealy JM, Wissbrun KF, "Melt Rheology and Its Role in Plastics Processing," p. 60, Chapman & Hall, New York (1989)

[11] Lide DR, "CRC Handbook of Chemistry and Physics," 74th ed., CRC Press, Florida, 1994 (1994)

[12] Goel SK, Beckman EJ, Polym. Eng. Sci., 34, 14 (1994)

[13] Matuana-Malanda L, Park CB, Balatinecz JJ, SPE ANTEC Tech. Papers, 41, 2394 (1995)

[14] Kumar V, Suh NP, Polym. Eng. Sci., 30, 20 (1990)

[15] Mark HF, Bikales NM, Overberger CG, Menges G, "Encyclopedia of Polymer Science and Engineering," 2nd ed., vol. 4, p. 431, John Wiley & Sons, New York, 1985 (1985)