Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings

Wong Chee Sien, Khairiah Badri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The influence of NCO/OH ratio of PU monomers on the thermal, mechanical and chemical properties of palm-based polyurethane (PU) was investigated. The prepolymerization of PU was conducted at NCO/OH ratio of palm kernel oil polyol (PKO-p) to 2,4-methylene diphenyl diisocyanate (MDI) at 200/100, 150/100, 100/100 and 75/100 with diethylene glycol (DEG) as chain extender at ambient temperature under nitrogen gas atmosphere. The palm-based PU prepolymer was casted onto a Teflon plate to a thickness of 50 μm. The presence of the urethane linkages (OCN-H) was identified from the FTIR spectrum. The disappearance of NCO peak in the FTIR spectrum at 2270-2250 cm-1 indicated that MDI had completely reacted with the PKO-p to form PU. The appearance of C=O peak at 1700 cm-1 showed that hydrogen bonds were formed between the soft segmented chain and hard segmented chain which were contributed by PKO-p and MDI respectively. Hence, urethane bond was the main polymeric chain in the PU. Besides, PU with the highest hard segment content (NCO/OH ratio: 200/100) exhibited great thermal stability (Tstable of 205°C). In addition, it showed the highest glass transition temperature (85°C) compared to other PU coating formulations. Endothermic peaks were detected in PU with low NCO/OH ratio of 150/100, 100/100 and 75/100 which was referred to the flash point of the polyols (PKO-p and diethylene glycol). However, PU with the highest content of hard segment possessed the lowest scratch resistance of 0.5 N. Steric effect due to benzene ring in MDI molecular chain caused restriction in the mobility of the PU chain.

Original languageEnglish
Title of host publicationApplied Mechanics and Materials
Pages227-231
Number of pages5
Volume313-314
DOIs
Publication statusPublished - 2013
Event2012 2nd International Conference on Machinery Electronics and Control Engineering, ICMECE 2012 - Jinan, Shandong
Duration: 29 Dec 201230 Dec 2012

Publication series

NameApplied Mechanics and Materials
Volume313-314
ISSN (Print)16609336
ISSN (Electronic)16627482

Other

Other2012 2nd International Conference on Machinery Electronics and Control Engineering, ICMECE 2012
CityJinan, Shandong
Period29/12/1230/12/12

Fingerprint

Polyurethanes
Coatings
Polyols
Palm oil
Glycols
Hot Temperature
Polytetrafluoroethylenes
Chemical properties
Benzene
Hydrogen bonds
Thermodynamic stability
Thermodynamic properties
Monomers
Nitrogen
Mechanical properties

Keywords

  • Coating
  • Palm kernel oil
  • Polyurethane
  • Prepolymerization

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Sien, W. C., & Badri, K. (2013). Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings. In Applied Mechanics and Materials (Vol. 313-314, pp. 227-231). (Applied Mechanics and Materials; Vol. 313-314). https://doi.org/10.4028/www.scientific.net/AMM.313-314.227

Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings. / Sien, Wong Chee; Badri, Khairiah.

Applied Mechanics and Materials. Vol. 313-314 2013. p. 227-231 (Applied Mechanics and Materials; Vol. 313-314).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sien, WC & Badri, K 2013, Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings. in Applied Mechanics and Materials. vol. 313-314, Applied Mechanics and Materials, vol. 313-314, pp. 227-231, 2012 2nd International Conference on Machinery Electronics and Control Engineering, ICMECE 2012, Jinan, Shandong, 29/12/12. https://doi.org/10.4028/www.scientific.net/AMM.313-314.227
Sien WC, Badri K. Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings. In Applied Mechanics and Materials. Vol. 313-314. 2013. p. 227-231. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.313-314.227
Sien, Wong Chee ; Badri, Khairiah. / Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings. Applied Mechanics and Materials. Vol. 313-314 2013. pp. 227-231 (Applied Mechanics and Materials).
@inproceedings{2bb4c18b865b43af95337af41095eb13,
title = "Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings",
abstract = "The influence of NCO/OH ratio of PU monomers on the thermal, mechanical and chemical properties of palm-based polyurethane (PU) was investigated. The prepolymerization of PU was conducted at NCO/OH ratio of palm kernel oil polyol (PKO-p) to 2,4-methylene diphenyl diisocyanate (MDI) at 200/100, 150/100, 100/100 and 75/100 with diethylene glycol (DEG) as chain extender at ambient temperature under nitrogen gas atmosphere. The palm-based PU prepolymer was casted onto a Teflon plate to a thickness of 50 μm. The presence of the urethane linkages (OCN-H) was identified from the FTIR spectrum. The disappearance of NCO peak in the FTIR spectrum at 2270-2250 cm-1 indicated that MDI had completely reacted with the PKO-p to form PU. The appearance of C=O peak at 1700 cm-1 showed that hydrogen bonds were formed between the soft segmented chain and hard segmented chain which were contributed by PKO-p and MDI respectively. Hence, urethane bond was the main polymeric chain in the PU. Besides, PU with the highest hard segment content (NCO/OH ratio: 200/100) exhibited great thermal stability (Tstable of 205°C). In addition, it showed the highest glass transition temperature (85°C) compared to other PU coating formulations. Endothermic peaks were detected in PU with low NCO/OH ratio of 150/100, 100/100 and 75/100 which was referred to the flash point of the polyols (PKO-p and diethylene glycol). However, PU with the highest content of hard segment possessed the lowest scratch resistance of 0.5 N. Steric effect due to benzene ring in MDI molecular chain caused restriction in the mobility of the PU chain.",
keywords = "Coating, Palm kernel oil, Polyurethane, Prepolymerization",
author = "Sien, {Wong Chee} and Khairiah Badri",
year = "2013",
doi = "10.4028/www.scientific.net/AMM.313-314.227",
language = "English",
isbn = "9783037856840",
volume = "313-314",
series = "Applied Mechanics and Materials",
pages = "227--231",
booktitle = "Applied Mechanics and Materials",

}

TY - GEN

T1 - Thermal, mechanical and chemical analyses of rapid and self-cured prepolymerized polyurethane coatings

AU - Sien, Wong Chee

AU - Badri, Khairiah

PY - 2013

Y1 - 2013

N2 - The influence of NCO/OH ratio of PU monomers on the thermal, mechanical and chemical properties of palm-based polyurethane (PU) was investigated. The prepolymerization of PU was conducted at NCO/OH ratio of palm kernel oil polyol (PKO-p) to 2,4-methylene diphenyl diisocyanate (MDI) at 200/100, 150/100, 100/100 and 75/100 with diethylene glycol (DEG) as chain extender at ambient temperature under nitrogen gas atmosphere. The palm-based PU prepolymer was casted onto a Teflon plate to a thickness of 50 μm. The presence of the urethane linkages (OCN-H) was identified from the FTIR spectrum. The disappearance of NCO peak in the FTIR spectrum at 2270-2250 cm-1 indicated that MDI had completely reacted with the PKO-p to form PU. The appearance of C=O peak at 1700 cm-1 showed that hydrogen bonds were formed between the soft segmented chain and hard segmented chain which were contributed by PKO-p and MDI respectively. Hence, urethane bond was the main polymeric chain in the PU. Besides, PU with the highest hard segment content (NCO/OH ratio: 200/100) exhibited great thermal stability (Tstable of 205°C). In addition, it showed the highest glass transition temperature (85°C) compared to other PU coating formulations. Endothermic peaks were detected in PU with low NCO/OH ratio of 150/100, 100/100 and 75/100 which was referred to the flash point of the polyols (PKO-p and diethylene glycol). However, PU with the highest content of hard segment possessed the lowest scratch resistance of 0.5 N. Steric effect due to benzene ring in MDI molecular chain caused restriction in the mobility of the PU chain.

AB - The influence of NCO/OH ratio of PU monomers on the thermal, mechanical and chemical properties of palm-based polyurethane (PU) was investigated. The prepolymerization of PU was conducted at NCO/OH ratio of palm kernel oil polyol (PKO-p) to 2,4-methylene diphenyl diisocyanate (MDI) at 200/100, 150/100, 100/100 and 75/100 with diethylene glycol (DEG) as chain extender at ambient temperature under nitrogen gas atmosphere. The palm-based PU prepolymer was casted onto a Teflon plate to a thickness of 50 μm. The presence of the urethane linkages (OCN-H) was identified from the FTIR spectrum. The disappearance of NCO peak in the FTIR spectrum at 2270-2250 cm-1 indicated that MDI had completely reacted with the PKO-p to form PU. The appearance of C=O peak at 1700 cm-1 showed that hydrogen bonds were formed between the soft segmented chain and hard segmented chain which were contributed by PKO-p and MDI respectively. Hence, urethane bond was the main polymeric chain in the PU. Besides, PU with the highest hard segment content (NCO/OH ratio: 200/100) exhibited great thermal stability (Tstable of 205°C). In addition, it showed the highest glass transition temperature (85°C) compared to other PU coating formulations. Endothermic peaks were detected in PU with low NCO/OH ratio of 150/100, 100/100 and 75/100 which was referred to the flash point of the polyols (PKO-p and diethylene glycol). However, PU with the highest content of hard segment possessed the lowest scratch resistance of 0.5 N. Steric effect due to benzene ring in MDI molecular chain caused restriction in the mobility of the PU chain.

KW - Coating

KW - Palm kernel oil

KW - Polyurethane

KW - Prepolymerization

UR - http://www.scopus.com/inward/record.url?scp=84876585881&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84876585881&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/AMM.313-314.227

DO - 10.4028/www.scientific.net/AMM.313-314.227

M3 - Conference contribution

AN - SCOPUS:84876585881

SN - 9783037856840

VL - 313-314

T3 - Applied Mechanics and Materials

SP - 227

EP - 231

BT - Applied Mechanics and Materials

ER -