Effect of TBPF Microencapsulated Ammonium Polyphosphate on the Properties of Thermoplastic Polyurethane Elastomer

2020 ◽  
Vol 842 ◽  
pp. 16-21
Author(s):  
Wei Ying Gao
Keyword(s):  
Phenolic Resin ◽  
Thermoplastic Polyurethane ◽  
Ammonium Polyphosphate ◽  
Polyurethane Elastomer ◽  
Flame Resistance ◽  
Cone Calorimetry ◽  
Limiting Oxygen Index ◽  
Elongation At Break ◽  
Hard Shell ◽  
Thermoplastic Polyurethane Elastomer

In our previous work, ammonium polyphosphate (APP) microcapsule with the shell of boron modified phenolic resin (BPF) was prepared, recorded as BPFAPP. However, the compatibility and the flame retardancy of BPFAPP in thermoplastic polyurethane elastomer (TPU) are still not very good due to the brittle and hard shell wall. To improve the brittleness of microcapsules shell and the property reinforcements of APP in TPU, APP was encapsulated with the tung oil and boron modified phenolic resin (TBPF) in this paper, recorded as TBPFAPP. The property reinforcements of TBPFAPP in TPU were studied. The thermogravimetry, limiting oxygen index and cone calorimetry analysis showed that TPU/TBPFAPP composite had higher char yield and better flame resistance. The tensile strength and elongation at break showed that the mechanical properties were also significantly improved due to the introduction of α-Eleostearate.

scholarly journals Thermoplastic Polyurethane Elastomer Nanocomposites: Morphology, Thermophysical, and Flammability Properties

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
Wai K. Ho ◽  
Joseph H. Koo ◽  
Ofodike A. Ezekoye
Keyword(s):  
Elevated Temperatures ◽  
Thermal Protection ◽  
Thermoplastic Polyurethane ◽  
Polyurethane Elastomer ◽  
Solid Rocket Motor ◽  
Cone Calorimetry ◽  
Novel Materials ◽  
Twin Screw ◽  
Thermoplastic Polyurethane Elastomer ◽  
Solid Rocket

Novel materials based on nanotechnology creating nontraditional ablators are rapidly changing the technology base for thermal protection systems. Formulations with the addition of nanoclays and carbon nanofibers in a neat thermoplastic polyurethane elastomer (TPU) were melt-compounded using twin-screw extrusion. The TPU nanocomposites (TPUNs) are proposed to replace Kevlar-filled ethylene-propylene-diene-monomer rubber, the current state-of-the-art solid rocket motor internal insulation. Scanning electron microscopy analysis was conducted to study the char characteristics of the TPUNs at elevated temperatures. Specimens were examined to analyze the morphological microstructure during the pyrolysis reaction and in fully charred states. Thermophysical properties of density, specific heat capacity, thermal diffusivity, and thermal conductivity of the different TPUN compositions were determined. To identify dual usage of these novel materials, cone calorimetry was employed to study the flammability properties of these TPUNs.

scholarly journals Fabrication and Properties of a Bio-Based Biodegradable Thermoplastic Polyurethane Elastomer

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1121
Author(s):  
Zhaoshan Wang ◽  
Jieqiong Yan ◽  
Tongyao Wang ◽  
Yingying Zai ◽  
Liyan Qiu ◽  
...  
Keyword(s):  
Soft Segment ◽  
Thermoplastic Polyurethane ◽  
Average Molecular Weight ◽  
Sebacic Acid ◽  
Polyurethane Elastomer ◽  
Two Phase ◽  
Elongation At Break ◽  
Atomic Force ◽  
Melt Polycondensation ◽  
Thermoplastic Polyurethane Elastomer

Using the melt polycondensation of five bio-based aliphatic monomers (succinic acid, sebacic acid, fumaric acid, 1,3-propanediol, and 1,4-butanediol), we first synthesized the more flexible and biodegradable polyester diols (BPD) with an average molecular weight of 3825. Then, the BPD was polymerized with excessive 4,4′-diphenylmethane diisocyanate (MDI). Finally, the molecular chain extender of 1,4-butanediol (BDO) was used to fabricate the biodegradable thermoplastic polyurethane elastomer (BTPU), comprising the soft segment of BPD and the hard segment polymerized by MDI and BDO. Atomic force microscope (AFM) images showed the two-phase structure of the BTPU. The tensile strength of the BTPU containing 60% BPD was about 30 MPa and elongation at break of the BTPU was over 800%. Notably, the BTPU had superior biodegradability in lipase solution and the biodegradation weight loss ratio of the BTPU containing 80% BPD reached 36.7% within 14 days in the lipase solution.

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