Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene

This report evaluates the flammability and melt dripping behaviour of different melt flow index (MFI) of polypropylene (PP) containing nitrogen-based intumescent flame-retardant (IFR) additives. Fire retardant (FR) additive loading was set at 20.5% to determine the possibility of a low loaded PP pol...

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Main Author: Ng, Wei Kang
Other Authors: Aravind Dasari
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2022
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Online Access:https://hdl.handle.net/10356/157212
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spelling sg-ntu-dr.10356-1572122022-05-11T12:34:47Z Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene Ng, Wei Kang Aravind Dasari School of Materials Science and Engineering aravind@ntu.edu.sg Science::Chemistry::Organic chemistry This report evaluates the flammability and melt dripping behaviour of different melt flow index (MFI) of polypropylene (PP) containing nitrogen-based intumescent flame-retardant (IFR) additives. Fire retardant (FR) additive loading was set at 20.5% to determine the possibility of a low loaded PP polymer. Additives tested are Melamine Pyrophosphate (MPP), Piperazine Pyrophosphate (PAPP) and Zinc Borate (ZB) It was found that regardless of MFI or ratio of additives loaded, UL94 performance for 20.5% loaded samples have only managed to achieve a V-2 or NR rating. Char formation of samples tested were insufficient in fully protecting samples and resulted in flame drips or the samples burning to completion. As samples only achieved V-2 or NR ratings, their extinguish times will be used to compare their flammability performance. Thermogravimetric analysis (TGA) reveals that a 3:2 or higher ratio of PAPP:MPP results in greater char residue which is shown to improve flammability performance. A higher MFI for FR loaded samples have also been shown to improve flammability performance as they remove the ignited portions through flame drips quicker, thereby preventing the rest of the sample from combusting. The conclusion drawn is that at such a low FR loading of 20.5%, there is little potential for a good FR product using current additives. The main issues to tackle would be the flame drips as well as the poor intumescent char formation as a result of said low FR loading. Bachelor of Engineering (Materials Engineering) 2022-05-11T12:34:46Z 2022-05-11T12:34:46Z 2022 Final Year Project (FYP) Ng, W. K. (2022). Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/157212 https://hdl.handle.net/10356/157212 en MSE/21/167 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Chemistry::Organic chemistry
spellingShingle Science::Chemistry::Organic chemistry
Ng, Wei Kang
Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
description This report evaluates the flammability and melt dripping behaviour of different melt flow index (MFI) of polypropylene (PP) containing nitrogen-based intumescent flame-retardant (IFR) additives. Fire retardant (FR) additive loading was set at 20.5% to determine the possibility of a low loaded PP polymer. Additives tested are Melamine Pyrophosphate (MPP), Piperazine Pyrophosphate (PAPP) and Zinc Borate (ZB) It was found that regardless of MFI or ratio of additives loaded, UL94 performance for 20.5% loaded samples have only managed to achieve a V-2 or NR rating. Char formation of samples tested were insufficient in fully protecting samples and resulted in flame drips or the samples burning to completion. As samples only achieved V-2 or NR ratings, their extinguish times will be used to compare their flammability performance. Thermogravimetric analysis (TGA) reveals that a 3:2 or higher ratio of PAPP:MPP results in greater char residue which is shown to improve flammability performance. A higher MFI for FR loaded samples have also been shown to improve flammability performance as they remove the ignited portions through flame drips quicker, thereby preventing the rest of the sample from combusting. The conclusion drawn is that at such a low FR loading of 20.5%, there is little potential for a good FR product using current additives. The main issues to tackle would be the flame drips as well as the poor intumescent char formation as a result of said low FR loading.
author2 Aravind Dasari
author_facet Aravind Dasari
Ng, Wei Kang
format Final Year Project
author Ng, Wei Kang
author_sort Ng, Wei Kang
title Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
title_short Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
title_full Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
title_fullStr Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
title_full_unstemmed Effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
title_sort effect of molecular weight on flammability and melt dripping behaviour of intumescent based flame retardant polypropylene
publisher Nanyang Technological University
publishDate 2022
url https://hdl.handle.net/10356/157212
_version_ 1734310234195755008