Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1575
標題: PET塑料之結晶模式之改良與其拉伸成型品之熱處理
Modification of the Crystallization Model for PET and the Heat Treatment of Its Stretch-Blow Product
作者: 廖承毅
Liao, Cheng-Yi
關鍵字: crystallinity
結晶度
PET
stretch-blow
heat treatment
PET
吹氣拉伸成型
熱處理
出版社: 機械工程學系所
引用: 參考文獻 1. 洪瑞庭,塑膠加工技術與工程,高立出版社,pp. 85-91,1992。 2. 射出成型機手冊,塑膠世界雜誌,pp. 2-23,1997。 3. 張永產,實用塑膠模具學,全華科技,pp. 33-35,1989。 4. T. Y. Chen , V. W. Wang and M. J. Bozarth, “Crystallization and Its Effect on the Processing of Polypropylene”, ANTEC, pp. 72-75, 1992. 5. M. Takayanagi and T. Kusumoto, Kogyo Kagaku Zasshi, 62, 587, 1959. 6. A. Ya. Malkin, V. P. Beghishev and I. A. Keapin, “Macrokinetics of Polymer Crystallization”, Polymer, Vol. 24, pp. 81-84, 1983. 7. 游家欣,吹氣拉伸成形PET寶特瓶退火結晶過程之電腦模擬分析,國立中興大學碩士論文,pp. 8-15,2004。 8. X. F. Lu and J. N. Hay, “Isothermal Crystallization Kinetics and Melting Behaviour of Poly(ethylene terephthalate) ”, Polymer, Vol. 42, pp. 9423-9431, 2001. 9. Pitt Supaphol, Nujalee Dangseeyun, Phornphon Srimoaon and Manit Nithitanakul, “Nonisothermal Melt-Crystallization Kinetics for Three Linear Aromatic Polyesters”, Thermochimica Acta, Vol. 406, pp. 207-220, 2003. 10. D. R. Salem, “Crystallization During Hot-Drawing of Poly(ethylene terephthalate) Film:Influence of the Deformation Mode”, Polymer Vol. 36, pp. 3605-3608, 1995. 11. K. Nakamura, T. Watanabe, K. katayama and T. Amano, “Some Aspects of Nonisothermal Crystallization of Polymers. I. Relationship Between Crystallization Temperature, Crystallinity and Cooling Condition”, J. Applied Polym. Sci, Vol. 16, pp. 1077-1091, 1972. 12. R. J. Young and P. A. Lovell, “Introduction to Polymers”, Chapman & Hall, pp. 4239-4244 , 1997. 13. Nujalee Dangseeyun, Phornphon Srimoaon, Pitt Supaphol and Manit Nithitanakul, “Isothermal Melt-Crystallization and Melting Behavior For Three Linear Aromatic Polyesters”, Thermochimica Acta, Vol. 409, pp. 63-67, 2004. 14. Z. Zhang, M. Ren, J. Zhao, S. Wu and H. Sun, “Kinetics of Non-isothermal Cold Crystallization of Uniaxially Oriented Poly(ethylene terephthalate) ”, Polymer, Vol. 44, pp. 2547-2551, 2003. 15. S. H. Kim, S. W. Park and E. S. Gil, “Crystallization Kinetic of Poly(ethylene terephthalate) with Thermotropic Liquid Crystalline Polymer Blends”, J. Applied Polym. Sci., Vol. 67, pp. 1383-1392, 1998. 16. C. Albano, J. Papa, M. Ichazo, J. Gonzalez and C. Ustariz, “Application of Different Macrokinetics Models to the Isothermal Crystallization of PP/Talc Blends”, Composite Structures, Vol. 62, pp. 291-302, 2003. 17. M. R. Kamal and P. G. Lafleur, “Heat Transfer in injection Molding of Crystallizable Polymers”, Polym. Eng. Sci, Vol. 24, pp. 692-697, 1984. 18. J. E. Spruiell and P. Supaphol, “Isothermal Melt- and Cold-Crystallization Kinetics and Subsequent Melting Behavior in Syndiotactic Polypropylene: a Differential Scanning Calorimetry Study”, Polymer, Vol. 42, pp. 699-712 , 2001. 19. P. Supaphol,“Application of the Avrami, Tobin, Malkin and Urbanovici-Segal Microkinetic Models to Isothermal Crystallization of Syndiotactic Polypropylene”, Thermochica Acta, 370, pp. 37-48, 2001. 20. 陳建銘,寶特瓶二段式製程中瓶胚模具之冷卻,國立中興大學碩士論文,pp. 4-8,2001。 21. 吳建興,寶特瓶二段式製程中吹氣模具之逆向熱傳分析,國立中興大學碩士論文,pp. 22-42,2001。
摘要: 摘要 本論文進行PET塑料之等溫結晶模式之改良,並探討PET吹氣拉伸成型寶特瓶之瓶身與其瓶胚胚口之熱處理過程(退火過程)對其結晶度之影響。於低溫時,文獻中Malkin之等溫結晶模式有高估結晶速率之現象,而Takayanagi之等溫結晶模式則會低估結晶速率,此研究修正Takayanagi之等溫結晶模式,並以PET塑料實驗所得之等溫結晶曲線與之比對,最後得到一組此修正後模式之係數,於低溫下,此修正後之結晶模式較能準確地預測實際結晶之狀況。此研究同時亦利用此修正後之等溫結晶模式以模擬PET塑料在三種等冷卻速率下之結晶行為,所得之結果並與一組Avrami等冷卻速率結晶模式所預測之結果進行比較。此研究亦發現此修正後之模式可用於預測PET瓶胚胚口於熱處理過程之結晶現象,研究中另藉由熱壓實驗來模擬PET寶特瓶瓶身之熱處理過程,以探討熱處理過程中模溫與貼合時間對於寶特瓶結晶度之影響。由X光繞射法量測之結果發現,寶特瓶之結晶主要發生在瓶胚之吹氣拉伸過程中,而熱處理過程中之結晶現象,可能由於所產生之晶體過小,且分散不集中,以致無法顯現於量測之結果中。 關鍵字:結晶度、PET、吹氣拉伸成型、熱處理。
ABSTRACT A modification of an isothermal crystallization model for PET is proposed and the effects of heat treatment (annealing process) on the crystallinity of a PET stretch-blow bottle and the mouth part of its preform were investigated. At low temperatures, Malkin's model over-estimates the crystallization rate for PET; conversely, Takayanagi's model under-estimates it. This work proposes a modified Takayanagi's model. Through a comparison with a set of isothermal crystallization lines, the coefficients in the model were obtained. At low temperatures, this model provides a better prediction of the crystallization. This model was also employed in simulation of the crystallization of PET for three cases under various cooling rates. The result was compared with that predicted using Avrami's constant cooling rate model. In this work, it was found that the modified model can not be used to predict the crystallization of the stretch-blow bottle during heat treatment. However, it yields a reasonable result in predicting the crystallization of the preform. A hot-compression experiment was used to simulate the heat treatment of the PET stretch-blow bottle. The effect of mold temperature and attaching time on the crystallinity was investigated. The result of the X-ray diffraction measurement reveals that, the crystallization for the PET bottle mainly is determined during stretch-blowing. The increase of the crystallinity through the heat treatment could not be observed from the measured data. This probably is because the increased crystals are too small and too diffuse. Thus the X-ray diffraction measurement could not detect their presence. Keywords : crystallinity, PET, stretch-blow, heat treatment
URI: http://hdl.handle.net/11455/1575
其他識別: U0005-1107200618404000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1107200618404000
Appears in Collections:機械工程學系所

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