اثر مشخصه‌های عامل هسته‌زا بر ساختار سلولی و خواص مکانیکی بر اسفنج‌های پلی‌اتیلن

نوع مقاله : تالیفی

نویسندگان

1 گروه پلیمر، پژوهشکده مهندسی کامپوزیت، مجتمع دانشگاهی مواد و فناوری ساخت، دانشگاه صنعتی مالک اشتر

2 تهران، دانشگاه صنعتی مالک اشتر، مجتمع دانشگاهی مواد و فناوری‌های ساخت

3 پژوهشکده مهندسی کامپوزیت-مجتمع دانشگاهی مواد و فناریهای ساخت-دانشگاه صنعتی مالک اشتر-تهران-ایران مدیر و هیئت علمی پژوهشکده مهندسی

چکیده

اسفنج‎ های پلی‌اتیلن به­ دلیل خواص منحصر به فردی چون نسبت استحکام به وزن مناسب، عایق گرمایی بسیار عالی، عایق صوتی و خواص مکانیکی خوب، مورد توجه ویژه جوامع علمی و صنعتی قرار گرفته ­اند. یکی از اهداف پژوهش ­های روز دنیا در زمینه اسفنج‌های پلی‌اتیلن، افزایش تراکم سلولی و کاهش اندازه سلول این مواد برای رسیدن به خواص مطلوب است. امروزه، این واقعیت کاملاً مشهود بوده که استفاده از عامل­ های هسته‌زا برای کنترل شکل ­شناسی سلول (یعنی تراکم سلول‎ ها، اندازه سلول و توزیع آن) در اسفنج‌های پلی‌اتیلن کاملاً ضروری است. در مطالعه حاضر، ابتدا دو نظریه هسته‌زایی و مشخصه‌های عامل هسته‌زا از نگاه نظریه‌های هسته‌زایی کلاسیک و میدان خودسازگار به‎ طور کامل بحث شده ­اند که مهم‌ترین و کاربردی­ ترین نظریه‌های هسته‌زایی در اسفنج ‎های پلیمری هستند. در ادامه، مشخصه‌های لازم برای انتخاب عامل هسته‎ زا در اسفنج‌های پلی‌اتیلن معرفی و بررسی شد. براساس بررسی‎ های انجام­ گرفته در این باره مشخص شده است، غلظت بهینه، چگالی انرژی آزاد حجمی و به ­­ویژه کشش سطحی، مهم‎ترین معیار و مشخصه‌های انتخاب عامل هسته‌زا در مقایسه با سایر پارامترها مانند هندسه (1F<، کمترین میزان تأثیر نسبت به دو عامل دیگر) اندازه ذرات، قابلیت پراکندگی و غیره هستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Nucleating Agent Characteristics on Cellular Structure and Mechanical Properties of Polyethylene Foams

نویسندگان [English]

  • mahmoud razavi zadeh 1
  • mohammad hosseini 2
  • Mohammad Reza Pourhosseini 3
  • mohammad khabiry 2
1 Department of Materials Science and Manufacturing Technology, Malek Ashtar University of Technology
2 Department of Materials Science and Manufacturing Technology, Malek Ashtar University of Technology
3 Polymer Departmenr, Composite Research Center, Material and Manufacturing Process Faculty, Malek Ashtar university, Tehran, Iran
چکیده [English]

Due to their unique properties such as proper strength to weight ratio, excellent thermal insulation, sound insulation and good mechanical properties polyethylene foams have received special attention from the scientific and industrial communities. One of the goals of modern research in the field of polyethylene foams is to increase the cell density and reduce the cell size of these materials to achieve the desired properties. Today, it is a well-known fact that the use of nucleating agents is absolutely necessary to control cell morphology (ie, cell density, cell size and distribution) in polyethylene foams. In the present study, first, two theories of nucleation and the characteristics of the nucleating agent have been fully discussed from the point of view of classical nucleation and self-consistent field theories, which are the most important and practical theories of nucleation in polymer foams. Then, the necessary characteristics for the selection of nucleating agent in polyethylene foams were introduced and examined. Based on the investigations carried out in this regard, it has been determined that the optimal concentration, volumetric free energy density, and especially surface tension of the nucleating agent, are the most important criteria and characteristics for the selection of a nucleating agent compared to other parameters such as geometry (F <1, the lowest effect compared to the other two factors) particle size, and dispersibility.

کلیدواژه‌ها [English]

  • polyethylene foam
  • Cellular nucleation
  • Nucleating agent
  • cell density
  • Cell size
1. Azdas T. and Hasanzadeh R., A Review on Principles and Fundamentals of Fabrication of Polymeric Foams in Regards 
to Increasing Cell Density/Reducing Cell Size,  Modares Mech. Eng. (Persian),  19, 211-222, 2019.
2. Roberts R.D. and Kwok J.C., Styrene-Maleic Anhydride Copolymer Foam for Heat Resisant Packaging, J. Cell Plas., 43, 135-143, 2007. 
3. Sorrentino L. and Aurilia M., and Iannace S., Polymeric Foams from High-Performance Thermoplasics, Adv. Polym. Technol., 30, 234-243, 2011.
 4. Okolieocha C., Raps D., Subramaniam K., and Altsädt V., Microcellular to Nanocellular Polymer Foams: Progress )2004-
2015) and Future Directions-A Review, Eur. Polym. J., 73, 500-519, 2015.
5. Davari M., Razavi Aghjeh M.K., and Seraji S.M., Relationship between the Cell Structure and Mechanical Properties of 
Chemically Crosslinked Polyethylene Foams, J. Appl. Polym. Sci.,  124, 2789-2797, 2012.
6. Kim Y., Park C.B., Chen P., and Thompson R.B., Origins of the Failure of Classical Nucleation Theory for Nanocellular 
Polymer Foams,  Soft Matter,  7, 7351-7358, 2012. 
7. Mokhtari M., Famili N., and Golbang A., A Review on the Application of Nucleation Theories in Thermoplasic Foams, 
Int. J. Plas. Polym. Technol., 4, 11-32, 2016
8. Leung S.N., Wong A., Guo Q., Park C.B., and Zong J.H., Change in the Critical Nucleation Radius and Its Impact on 
Cell Stability During Polymeric Foaming Processes, Chem. Eng. Sci.,  64, 4899-4907, 2009.
9. Turnbull D. and Vonnegut B., Nucleation Catalysis, Ind. Eng. Chem., 44, 1992-1998, 1952.
10. Yeongyoon K., Park C.B., Chen P., and Thompson R.B., Towards Maximal Cell Density Predictions for Polymeric Foams, 
Polymer,  24, 5622-5629, 2011.
11. Merikanto J., Zapadinsky E., Lauri A., and Vehkamäki H., Origin of the Failure of Classical Nucleation Theory: Incorrect 
Description of the Smalles Clusers, Phys. Rev. Lett., 98, 145-160, 2007.
12. Saiz-Arroyo C., Rodríguez-Pérez M.Á., Velasco J.I., and de Saja J.A., Infuence of Foaming Process on the Structure–Properties Relationship of Foamed LDPE/Silica Nanocomposites, Compos. Part B: Eng., 48, 40-50, 2013.
13. Bihua X., Xu W., Wang K., Huang Q., Liang W., and Sun X., Study of Mechanical Property and Cellular Structure based 
on the Controllable Crosslinking Polyethylene Foaming Materials,  IOP Conf.  Series Mater. Sci. Eng.,  544, 012058, 
2019.
14. Jo C. and Naguib H.E., Efect of Nanoclay and Foaming Conditions on the Mechanical Properties of HDPE–Clay Nanocomposite Foams,  J. Cell. Plas.,  43, 111-121, 2007.
15. Baseghi S., Garmabi H., Gavgani J.N., and Adelnia H., Lightweight High-Density Polyethylene/Carbonaceous 
Nanosheets Microcellular Foams with Improved Electrical Conductivity and Mechanical Properties, Am. J. Mater. Sci., 50, 
4994-5004, 2015.
16. Zandi F., Rezaei M., and Kasiri A., Efect of Nanoclay on the Physical-Mechanical and Thermal Properties 
and Microsructure of Extruded Noncross-linked LDPE Nanocomposite Foams, Key Eng. Mater., 471, 751-756, 2011.
17. Yongsi Y., Iqbal A., Wu C., Wang Y., Li G., and Qi R., Electrical Conductivity of Carbon Black/Single-Wall Carbon Nanotube/Low-Density Polyethylene Ternary Composite Foam, J. Appl. Polym. Sci., 137, 483-493, 2020.
18. Chen L., Blizard K., Straf R., and Wang X., Efect of Filler Size on Cell Nucleation During Foaming Process,  J. Cell 
Plas.,  38, 139-148, 2002.
19. Myers D., Surfaces Interfaces And Colloids, USA, 210-220, 1999.
20. Shaker Raisi B., Yaghmaei S., and Riahi Far M., Methods for Measuring the Surface Tension of Liquids, Iran Ceram. Quart., 2, 22-32, 2016.
21. Ebnesajjad S., Surface Treatment of Materials for Adhesive, Oxford, 20-37, 2013.
22. Biza P., Talc-A Modern Solution for Pitch and Stickies Control, Pap. Technol., 42, 22-24, 2001.
23. Girifalco L.A. and Good R.J., A Theory for the Esimation of Surface and Interfacial Energies. I. Derivation and Application to Interfacial Tension, J. Phys. Chem., 61, 904-909, 1957.
24. Gilman J.J., Direct Measurements of the Surface Energies of Crysals, J. Appl. Phys., 31, 2208-2218, 1960.
25. Lili F., A Study Using Diferent Types of Fumed Silica to Modify the Flowablity,  Wettability and Surface Free Energy of a Model Cohesive Powder, PhD Disseration, Monash University, February 2014.
26. Stöckelhuber K.W., Das A., Jurk R., and Heinrich G., Contribution of Physico-Chemical Properties of Interfaces on Dispersibility, Adhesion and Flocculation of Filler Particles in Rubber, Polymer, 51, 1954-1956, 2010.
27. Stockelhuber K.W., Sviskov A., Pelevin A.G., and Heinrich G., Impact of Filler Surface Modifcation on Large Scale 
Mechanics of Styrene Butadiene/Silica Rubber Composites, Macromolecules,  44, 4366-4381, 2011.
28. Chen B., Ma N., Bai X., Zhang H., and Zhang Y., Efects of Graphene Oxide on Surface Energy, Mechanical, Damping and Thermal Properties of Ethylene-Propylene-Diene Rubber/Petroleum Resin Blends, Rsc Adv., 2, 4683-4689, 2012.
29. Tang Z., Zhang L., Feng W., Guo B., Liu F., and Jia D., Rational Design of Graphene Surface Chemisry for High-
Performance Rubber/Graphene Composites, Macromolecules, 47, 8663-8673, 2014.
30. Liu Z., Liu J.Z., Cheng Y., Li Z., Wang L., and Zheng Q., Interlayer Binding Energy of Graphite: A Mesoscopic 
Determination From Deformation, Phys. Rev. B, 85, 205-418, 2012.
31. Wang S., Zhang Y., Noureddine Abidi, and Luis Cabrales.,Wettability and Surface Free Energy of Graphene Films, Langmuir, 25, 11078-11081, 2009.
32. Lee J. and Lee B., A Simple Method to Determine the Surface Energy of Graphite, Carbon lett., 21, 107-110, 2017.
33. Kooshki R.M., Ghasemi I., Karrabi M., and Azizi H., Nanocomposites Based on Polycarbonate/Poly(butylene 
terephthalate) Blends Efects of Disribution and Type of Nanoclay on Morphological Behavior, J. Vinyl Addit. Technol., 
19, 203-212, 2013.
34. Ammar A., Elzatahry A., Al-Maadeed M., Alenizi A.M., Huq A.F., and Karim A., Nanoclay Compatibilization of Phase 
Separated Polysulfone/Polyimide Films for Oxygen Barrier, Appl. Clay Sci., 137, 123-134, 2017.
35. Leung S.N., Wong A., Park C.B., and Zong J.H., Ideal Surface Geometries of Nucleating Agents to Enhance Cell Nucleation in Polymeric Foaming Processes,  J. Appl. Polym. Sci.,  108, 3997-4003, 2008.
36. McClurg R.B., Design Criteria for Ideal Foam Nucleating Agents,  Chem. Eng. Sci.,  59, 5779-5786, 2004.
37. Leung S.N. and Park C.B., and Li H., Efects of Nucleating Agents Shapes and Interfacial Properties on Cell Nucleation, 
J. Cell Plas., 46, 441-460, 2010.