| Autor: |
Chris Wu, Si-Chao Lao, Kai Llc, Joseph H. Koo, G. Wissler, Christine Tower, Zhiping Luo, L. A. Pilato |
| Rok vydání: |
2008 |
| Předmět: |
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| Zdroj: |
49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 16th AIAA/ASME/AHS Adaptive Structures Conference 10t. |
| DOI: |
10.2514/6.2008-1856 |
| Popis: |
The objective of this research is to develop an improved polyamide 11 polymer with enhanced flame retardancy, thermal, and mechanical properties for selective laser sintering rapid manufacturing. In the present study, a nanophase was introduced into the polyamide 11 and combining it with a conventional intumescent flame retardant (FR) additive via twin screw extrusion. Polyamide 11 polymer pellets were mixed separately with chemically modified montmorillonite (MMT) organoclays or carbon nanofibers (CNFs) and an intumescent FR additive to create a family of intumescent FR polyamide 11 nanocomposites. Transmission electron microscopy (TEM) analyses indicated good dispersion of nanoparticles and intumescent FR additives in the polymer matrix. Injection molded specimens were fabricated for physical, thermal, and flammability measurements. Thermal stability of these intumescent FR polyamide 11 nanocomposites was examined by TGA. All systems of polyamide 11 containing nanoparticles and FR additive have higher decomposition temperatures than those compositions with solely nanoparticles or FR additive alone. For the FR-PA11-nanoclay polymers, only the formulations with 20% FR and 7.5% clay passed the UL 94 V-0 requirement. For the FR-PA11-CNF polymers, all three formulations passed UL 94 V-0 requirement. Some trends and relationships were observed between the results of cone calorimetry, and those of TGA and UL 94. Mechanical properties are compromised due to the large amount of intumescent FR additive in the PA11 polymer system. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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