Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani

Waterborne polyurethane (PU) was synthesized by reacting PMDI/MDI and PEG with varying ratio of isocyanate; 1.5:1, 2.0:1, 2.5.1 and 3.0:1. The structural were analyzed using FT-IR and UV/VIS Spectrophotometer and the melting point,Tm and latent heat of fusion of the polymer were determined by using...

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Main Author:	Abdul Ghani, Mohd Firkhry Fadhly
Format:	Student Project
Language:	English
Published:	Faculty of Applied Sciences 2009
Subjects:	Organic chemistry Biochemistry
Online Access:	http://ir.uitm.edu.my/id/eprint/23179/ http://ir.uitm.edu.my/id/eprint/23179/1/PPb_MOHD%20FIRKHRY%20FADHLY%20ABDUL%20GHANI%20AS%2009_5.pdf

id	uitm-23179
recordtype	eprints
spelling	uitm-231792019-02-25T03:51:59Z http://ir.uitm.edu.my/id/eprint/23179/ Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani Abdul Ghani, Mohd Firkhry Fadhly Organic chemistry Biochemistry Waterborne polyurethane (PU) was synthesized by reacting PMDI/MDI and PEG with varying ratio of isocyanate; 1.5:1, 2.0:1, 2.5.1 and 3.0:1. The structural were analyzed using FT-IR and UV/VIS Spectrophotometer and the melting point,Tm and latent heat of fusion of the polymer were determined by using DSC. There is an obvious association peak appeared at 3460-3490 cm⁻¹, which was characteristic of stretching vibration of NH group in the urethane linkage. The peak about 2280 cm⁻¹ is the interest peak to be observed which contributes to the isocyanate group of PMDI/MDI which observed in the freshly prepared sample gradually decrease over time as curing process. Bathchromic shifts in the UV spectra were observed as MDI was converted into urethane. The UV absorption peaks of PU appeared at 285 nm due to the ππ* transition. When a hydroxyl group reacted with the NCO group, the resonance structure of the isocyanate group was destroyed. The transition enthalpy of the polymeric solid PUs are not consistent before the exposure compare to the after the exposure, the highest of them was 327.053 J/g for the ratio NCO: OH = 1.5:1 with Tm 166.666°C; furthermore, most of them were more above 200 J/g. The highest enthalpy of PU after exposure is 284.555 J/g for the ratio NCO: OH = 3.0:1 with Tm 161.337°C. After exposure to the sunlight, there is gradual decrease of Tm from ratio 1.5:1 to 3.0:1; however, the enthalpy of the PU for after exposure to the sunlight decreases with increasing ratio of isocyanate group affecting crystallinity of PU due to less urethane linkage in the polymer. Faculty of Applied Sciences 2009 Student Project NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/23179/1/PPb_MOHD%20FIRKHRY%20FADHLY%20ABDUL%20GHANI%20AS%2009_5.pdf Abdul Ghani, Mohd Firkhry Fadhly (2009) Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani. [Student Project] (Unpublished)
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Teknologi MARA
building	UiTM Institutional Repository
collection	Online Access
language	English
topic	Organic chemistry Biochemistry
spellingShingle	Organic chemistry Biochemistry Abdul Ghani, Mohd Firkhry Fadhly Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
description	Waterborne polyurethane (PU) was synthesized by reacting PMDI/MDI and PEG with varying ratio of isocyanate; 1.5:1, 2.0:1, 2.5.1 and 3.0:1. The structural were analyzed using FT-IR and UV/VIS Spectrophotometer and the melting point,Tm and latent heat of fusion of the polymer were determined by using DSC. There is an obvious association peak appeared at 3460-3490 cm⁻¹, which was characteristic of stretching vibration of NH group in the urethane linkage. The peak about 2280 cm⁻¹ is the interest peak to be observed which contributes to the isocyanate group of PMDI/MDI which observed in the freshly prepared sample gradually decrease over time as curing process. Bathchromic shifts in the UV spectra were observed as MDI was converted into urethane. The UV absorption peaks of PU appeared at 285 nm due to the ππ* transition. When a hydroxyl group reacted with the NCO group, the resonance structure of the isocyanate group was destroyed. The transition enthalpy of the polymeric solid PUs are not consistent before the exposure compare to the after the exposure, the highest of them was 327.053 J/g for the ratio NCO: OH = 1.5:1 with Tm 166.666°C; furthermore, most of them were more above 200 J/g. The highest enthalpy of PU after exposure is 284.555 J/g for the ratio NCO: OH = 3.0:1 with Tm 161.337°C. After exposure to the sunlight, there is gradual decrease of Tm from ratio 1.5:1 to 3.0:1; however, the enthalpy of the PU for after exposure to the sunlight decreases with increasing ratio of isocyanate group affecting crystallinity of PU due to less urethane linkage in the polymer.
format	Student Project
author	Abdul Ghani, Mohd Firkhry Fadhly
author_facet	Abdul Ghani, Mohd Firkhry Fadhly
author_sort	Abdul Ghani, Mohd Firkhry Fadhly
title	Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
title_short	Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
title_full	Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
title_fullStr	Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
title_full_unstemmed	Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani
title_sort	characterization of waterbased pu using different ratio mdi/peg & effect on exposure to sunlight / mohd firkhry fadhly abdul ghani
publisher	Faculty of Applied Sciences
publishDate	2009
url	http://ir.uitm.edu.my/id/eprint/23179/ http://ir.uitm.edu.my/id/eprint/23179/1/PPb_MOHD%20FIRKHRY%20FADHLY%20ABDUL%20GHANI%20AS%2009_5.pdf
first_indexed	2023-09-18T23:10:14Z
last_indexed	2023-09-18T23:10:14Z
_version_	1777418753529610240

Characterization of waterbased PU using different ratio MDI/PEG & effect on exposure to sunlight / Mohd Firkhry Fadhly Abdul Ghani

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