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Investigation of Novel Poly(urethane-urea) and MMT Foams derived via In-situ Technique

Ayesha Kausar

Abstract


Thermal and mechanical behavior and fire performance of novel series of flame-retardant high impact poly(urethane-urea) (PUU)/montmorillonite nanocomposites and foams were designed and studied by various means. Silicate layers of hydroxyl modified montmorillonite (H-MMT) was well exfoliated in PUU matrix due to in-situ reaction between the clay and poly(urethane-urea). The combination of PUU and montmorillonite modified with bis-2-hydroxyethyl ammonium as flame retardant enhanced the charring capacity and non-flammability of foams and also increased the thermal performance with nanofiller loading. FESEM illustrated increased cell density and reduced cell size in PUU/H-MMT 1-5 Foam (1-5 wt. % nanofiller) relative to pure PUU foam. Compression strength and modulus of PUU/H-MMT 1 Foam (1 wt. % nanofiller) was 30.1 MPa and 3 GPa respectively, which was increased to 36.7 MPa and 8 GPa in PUU/H-MMT 5 Foam (5 wt. % nanofiller). 10 % thermal decomposition temperature of PUU/H-MMT 1-5 Foams were in the range 488–519 °C. In PUU/H-MMT 5 Foam Tg was increased to 157 °C relative to PUU/H-MMT 1 (Tg 147 °C). LOI and UL 94 tests had shown improved non-flammability (V-0 rating) with H-MMT loading.

      


Keywords


Poly(urethane-urea); montmorillonite; foam; LOI; UL 94

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References


Gnanarajan T P, Iyer N P, Nasar A S, Radhakrishnan G. Preparation and properties of poly(urethane-imide)s derived from amine-blocked-polyurethane prepolymer and pyromellitic dianhydride. Eur Polym J. 2002, 38:487-495

Kausar A, Zulfiqar S, Yavuz C T, Sarwar M I. Investigation on novel thermoplastic poly(urethane-thiourea-imide)s with enhanced chemical and heat resistance. Polym Degrad Stab. 2011, 96:1333-1341

Kausar A, Hussain S. T. Effect of modified filler surfaces and filler-tethered polymer chains on morphology and physical properties of poly(azo-pyridyl-urethane)/multi-walled carbon nanotube nanocomposites. J Plast Film Sheet. 2013, 30:181-204

Raghu A V, Gadaginamath G S, Mallikarjuna N N, Aminabhavi T M. Synthesis and characterization of novel polyureas based on benzimidazoline-2-one and benzimidazoline-2-thione hard segments. J Appl Polym Sci. 2006, 100:576-583

Pil-Ho H, Myung-Geun C, Nam Ju J. Effect of salt concentration on the glass transition temperature and ionic conductivity of poly(ethylene glycol)-polyurethane/LiClO4 complexes. Macromol Res. 2004, 12:422-426

Nagai A, Ishikawa J, Kudo H, Endo T. Synthesis of optically active polyurethanes by self-polyaddition of tyrosine-based monomers. J Polym Sci A Polym Chem. 2004, 42:1143-1153

Li Z F, Yang G H, Xu C M. Effect of the crosslink density on the morphology and properties of reaction-injection-molding poly(urethane urea) elastomers. J Polym Sci A Polym Chem. 2004, 42:1126-1131

Ma Z, Hong Y, Nelson D M. Biodegradable polyurethane ureas with variable polyester or polycarbonate soft segments: effects of crystallinity, molecular weight, and composition on mechanical properties. Biomacromolecules. 2011, 12:3265-3274

Pandey S, Rath S K, Samui A B. Structure–thermomechanical property correlations of highly branched siloxane–urethane networks. Indust Eng Chem Res. 2012, 51:3531-3540

Zeng C, Han X, Lee L J, Koelling K W, Tomasko D L. Polymer-clay nanocomposite foams prepared using carbon dioxide. Adv Mater. 2003, 15:1743-1747

Kim Y H, Choi S J, Kim J M, Han M S, Kim W N, Bang K T. Effects of organoclay on the thermal insulating properties of rigid polyurethane foams blown by environmentally friendly blowing agents. Macromol Res. 2007, 15:676-681.

Lepoittevin B, Pantoustier N, Devalckenaere M, Alexandre M, Kubies D, Calberg C, Jerome R, Dubois P. Pol(e-caprolactone)/clay nanocomposites prepared by melt intercalation: mechanical thermal and rheological properties. Macromolecules. 2002, 35:8385-8390

Mitsunaga M, Ito Y, Ray S S, Okamoto M, Hironaka K. Intercalated Polycarbonate/Clay Nanocomposites: Nanostructure Control and Foam Processing. Macromol Mater Eng. 2003, 285:543-548

Hussain F, Hojjati M, Okamoto M, Gorga R E. Polymer-matrix Nanocomposites, Processing, Manufacturing, and Application: An Overview. J Compos Mater. 2006, 40:1511-1175

Kausar A, Zulfiqar S, Ishaq M, Sarwar M I. Mechanical properties of functionalized SEBS based inorganic hybrid materials. Polym Bull. 2007, 59:457-468.

Gupta B, Lacrampe M F, Krawczak P. Polyamide-6/clay nanocomposites. Polym. Polym Compos. 2006, 14:13-38

Kiliaris P, Papaspirides C D. Polymer/layered silicate(clay) nanocomposites: an overview of flame retardancy. Prog Polym Sci. 2010, 35:902-958

Cervantes J M, Cauich-Rodriguez J V, Vazquez-Torres H, Garfias-Mesias L F, Paul R D. Thermal degradation of commercially available organoclays studied by TGA-FTIR. Thermochim Acta. 2007, 457:92-102

Marras S I, Tsimpliaraki A, Zuburtikudis I, Panayiotou C. Morphological, thermal, and mechanical characteristics of polymer/layered silicate nanocomposites: the role of filler modification level. Polym Eng Sci. 2009, 49:1206-1217

Cervantes-Uc J M, Moo Espinosa J I, Cauich-Rodriguez J V, Avila-Ortega A, Vazquez-Torres H, Marcos-Fernandez A. TGA/FTIR studies of segmented aliphatic polyurethanes and their nanocomposites prepared with commercial montmorillonites. Polym Degrad Stab. 2009, 94:1666-1677

Su S, Wilkie C. The thermal degradation of nanocomposites that contain an oligomeric ammonium cation on the clay. Polym Degrad Stab. 2004, 8:347-362

Sinha Ray S, Biswas M. Recent progress in preparation and evaluation of montmorillonite/polymer nanocomposites. Adv Polym Sci. 2001, 155:167-221

Bishop J L, Murad E. Characterization of minerals and biogeochemical markers on Mars: A Raman and IR spectroscopic study of montmorillonite. J Raman Spectrosc. 2004, 35:480-486

Chalivendra V B, Shukls A. Processing and mechanical characterization of lightweight polyurethane composites. J Mater Sci. 2003, 38:1631-1643.

Gupta N, Woldesenbet E, Mensah P. Compression properties of syntactic foams: effect of cenosphere radius ratio and specimen aspect ratio. Compos Part A. 2004, 35:103-111

Tien YI, Wei KH. High-tensile-property layered silicates/polyurethane nanocomposites by using reactive silicates as pseudo chain extenders. Macromolecules. 2001, 34:9045-9052

Liu Y L, Hsiue G H, Chiu Y S, Jeng R J, Perng L H. Phosphorus-containing epoxy for flame retardant. I. Synthesis, thermal, and flame-retardant properties. J Appl Polym Sci. 1996, 61:613-621


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