34 research outputs found
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Flame Retardant Intumescent Polyamide 11 Nanocomposites – Further Study
The objective of this research is to develop improved polyamide 11 and 12 polymers with
enhanced flame retardancy, thermal, and mechanical properties for selective laser sintering
(SLS) rapid manufacturing (RM). In the present study, a nanophase was introduced into the
polyamide 11 and combine with a conventional intumescent flame retardant (FR) additive via
twin screw extrusion. Arkema Rilsan® polyamide 11 molding polymer pellets were used with
two types of nanoparticles such as: chemically modified montmorillonite (MMT) organoclays
and carbon nanofibers (CNFs). Two types of Clariant’s Exolit® OP 1311 and 1312 intumescent
FR additives were used to generate a family of FR intumescent polyamide 11 nanocomposites
with anticipated synergism.Mechanical Engineerin
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Flammability and Thermal Properties of Polyamide 11-Alumina Nanocomposites
Neat polyamides 11 and 12 lack high strength/high heat resistance and flame retardancy.
The incorporation of selected nanoparticles is expected to enhance these properties to a
level that is desired and required for performance driven applications. This enhancement
may result in additional market opportunities for the polyamide 11 and 12 polymer
manufacturers. The objective of this study is to develop polyamide 11 polymer
nanocomposites with enhanced thermal, flammability, and mechanical performance for
selective laser sintering (SLS) rapid manufacturing. Three types of nano-alumnia (X-0
needle, X-25SR, and X-0SR) with different organic treatments were melt-compounded
into polyamide 11 in three different weight loadings of the nanoparticles (2.5%, 5%, and
7.5%). Injection molded specimens were fabricated for thermal, flammability, and
mechanical properties characterization. Although nano-alumina was uniformly dispersed
in polyamide 11 and better thermal stability of the nanomodified materials was observed,
the desired FR characteristics of the nanomodified polyamide 11 was not achieved. None
of the materials passed the desired UL 94 V0 rating.Mechanical Engineerin
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Polyamide 11-Carbon Nanotubes Nanocomposites: Processing, Morphological, and Property Characterization
The objective of this research is to develop a multifunctional polyamide 11 (PA11)
polymer with enhanced electrical, thermal, mechanical, and flammability properties for
selective laser sintering (SLS) rapid manufacturing through the use of nanotechnology. In
the present study, a nanophase was introduced into PA11 powder via rotation &
revolution and twin screw extrusion techniques to disperse the MWNTs in the PA11
pellet. Arkema Rilsan® polyamide 11 molding polymer pellets were used with 1, 3, 5,
and 7 wt% loadings of Arkema’s Graphistrength™ multi-wall carbon nanotubes
(MWNTs) to create a family of PA11-MWNT nanocomposites using twin screw
extrusion technique. Arkema Rilsan® polyamide 11 powders were blended with 5 wt%
loading of Graphistrength™ MWNTs using the rotation & revolution technique to create
another set of PA11-MWNT nanocomposites.
Transmission electron microscopy and scanning electron microscopy were used to
determine the degree and uniformity of dispersion of MWNTs in the PA11 polymer.
Injection and compression molded test specimens were fabricated for physical, electrical,
thermal, mechanical, and flammability properties characterization. Thermal stability of
these polyamide 11-MWNT nanocomposites was examined by TGA. Kinetic parameters
were calculated using isoconversion technique. Electrical properties were measured using
ASTM D257. Mechanical properties such as ultimate tensile strength, rupture tensile
strength, and elongation at rupture were measured. Flammability properties were
obtained using the UL 94 test method. All these different test methods and subsequent
polymer characteristics are discussed in this paper.Mechanical Engineerin