thermal properties | An-Najah Staff

Thermal Properties of Automotive Polymers ‎III – Thermal Characteristics and ‎Flammability of Fire Retardant Polymers

Thu, 2014-04-03 13:24 — Shehdeh Jodeh

Journal Title, Volume, Page:

Material Research Innovations, Volume 4, Issue 2-3, pp 135-143

Year of Publication:

2001

Link:

http://link.springer.com/article/10.1007%2Fs100190000074

Authors:

S. W. Jodeh

Delphi Research Labs, MC 480-106-104, 30500 Mound Road, Warren, MI 48090, USA

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

I.A. Abu Isa

Delphi Research Labs, MC 480-106-104, 30500 Mound Road, Warren, MI 48090, USA

Preferred Abstract (Original):

Thermal properties and flammability behavior of two grades of fire retardant polypropylene and nylon 66, and their base resins were determined. A nylon 6 base polymer and a nano-composite based on that polymer were also analyzed. Thermal gravimetric analysis showed more complex degradation patterns for the fire retardant grades as compared to the base resin. This was attributed to decomposition of ingredients present in the fire retardant. Degradation of polypropylene in air started at about 100°C lower temperature than degradation in nitrogen. For nylon, the degradation in both atmospheres occurred at approximately the same temperature. Modulated Differential Scanning Calorimetry (MDSC) measurements were used to determine melting and glass transition temperatures, heats of fusion, heat capacity and thermal conductivity. Both phosphorus-based and halogen-based fire retardants modified the ignition, propagation, and melt-dripping behavior of nylon and polypropylene during burning. Incorporation of a nano-filler was found to be ineffective in imparting fire retardancy to nylon 6. Performance of these materials will have to be evaluated in actual vehicle applications and fire exposures before use on a broad scale basis.

Addition of oils to polylactide casting solutions as a tool to tune film morphology and mechanical properties

Thu, 2013-02-14 14:27 — Hassan Ismaiel Sawalha (Manasra)

Journal Title, Volume, Page:

Polymer engineering and science, 50(3): p. 513-519.

Year of Publication:

2010

Link:

http://onlinelibrary.wiley.com/doi/10.1002/pen.21557/abstract

Authors:

Hassan Sawalha

Food and Bioprocess Engineering Group, Wageningen University, 6700 EV Wageningen, The Netherlands

Current Affiliation:

Chemical Engineering Department, An-Najah National University, Nablus, Palestine

[email protected]

Karin Schroën

Food and Bioprocess Engineering Group, Wageningen University, 6700 EV Wageningen, The Netherlands

Remko Boom

Food and Bioprocess Engineering Group, Wageningen University, 6700 EV Wageningen, The Netherlands

Preferred Abstract (Original):

Poly(L-lactide) (PLLA) films exhibit toughening by the addition of oils to the polymer casting. This was investigated by casting films from solution and evaporation in air; the investigated oils were linear alkanes, cyclic alkanes, and two terpenes (limonene and eugenol). The addition of the oils greatly influenced the morphology and thermal and mechanical properties of the films. Most oils rendered porous films, and a variety of morphologies was obtained. Films prepared with hexane and eugenol showed a solid, nonporous structure similar to neat PLLA films, with similar mechanical properties. The thermal transition temperatures of the films decreased through the addition of oil, depending on the oil used, the decrease could be up to 30°C (glass transition), 45°C (cold crystallization), and 15°C (melting temperature). The films prepared without oil were stiff and brittle. Upon addition of most of the oils, the maximum strength and elastic moduli decreased, but their ductility improved considerably. Limonene, the most extreme case, gave a very ductile film with an elongation at break up to 200%. The main conclusion of this study is that various oils can be used to tune and improve the properties of PLLA films. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers