Chain extension studies of water-borne polyurethanes from methyl ethyl ketoxime/ε-caprolactam-blocked aromatic isocyanates

S. Subramani, I. W. Cheong, Jung-Hyun Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A series of water-based blocked aromatic polyurethane dispersions (BPUDs) were prepared by prepolymer mixing process, using toluene 2,4-diisocyanate (TDI), 4,4′-di-p-phenylmethane diisocyanate (MDI), poly (oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA), methyl ethyl ketoxime (MEKO) and ε-caprolactam (CL). Particle size, viscosity, pH, molecular weight, storage stability, and deblocking temperature of the BPUDs were measured and compared. Chain extension of BPUD was carried out with three types of chain extenders, hexamethylene diamine (HMDA), isophorone diamine (IPDA) and tetraethylene pentamine (TEPA), at various de-blocking temperatures. Tensile and thermal properties of the chain extended BPUD films were investigated and results confirmed that MEKO-BPUDs de-blocked at lower temperature than ε-caprolactam-BPUDs. The Tg values of the chain extended BPUDs were higher than those of the BPUDs and pure PTMG. Improvement in the thermal stability confirmed the de-blocking and chain extension reaction of blocked PU prepolymers.

Original languageEnglish
Pages (from-to)328-338
Number of pages11
JournalProgress in Organic Coatings
Volume51
Issue number4
DOIs
Publication statusPublished - 2004 Dec 20

Fingerprint

Caprolactam
Isocyanates
Oximes
Polyurethanes
Dispersions
Water
Glycols
pentamine
Toluene 2,4-Diisocyanate
Propionic acid
Tensile properties
Temperature
Toluene
Thermodynamic stability
Thermodynamic properties
Molecular weight
Particle size
Viscosity

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

Cite this

@article{23a92d974c444f0eab1aaa01020caa88,
title = "Chain extension studies of water-borne polyurethanes from methyl ethyl ketoxime/ε-caprolactam-blocked aromatic isocyanates",
abstract = "A series of water-based blocked aromatic polyurethane dispersions (BPUDs) were prepared by prepolymer mixing process, using toluene 2,4-diisocyanate (TDI), 4,4′-di-p-phenylmethane diisocyanate (MDI), poly (oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA), methyl ethyl ketoxime (MEKO) and ε-caprolactam (CL). Particle size, viscosity, pH, molecular weight, storage stability, and deblocking temperature of the BPUDs were measured and compared. Chain extension of BPUD was carried out with three types of chain extenders, hexamethylene diamine (HMDA), isophorone diamine (IPDA) and tetraethylene pentamine (TEPA), at various de-blocking temperatures. Tensile and thermal properties of the chain extended BPUD films were investigated and results confirmed that MEKO-BPUDs de-blocked at lower temperature than ε-caprolactam-BPUDs. The Tg values of the chain extended BPUDs were higher than those of the BPUDs and pure PTMG. Improvement in the thermal stability confirmed the de-blocking and chain extension reaction of blocked PU prepolymers.",
author = "S. Subramani and Cheong, {I. W.} and Jung-Hyun Kim",
year = "2004",
month = "12",
day = "20",
doi = "10.1016/j.porgcoat.2004.08.004",
language = "English",
volume = "51",
pages = "328--338",
journal = "Progress in Organic Coatings",
issn = "0033-0655",
publisher = "Elsevier",
number = "4",

}

Chain extension studies of water-borne polyurethanes from methyl ethyl ketoxime/ε-caprolactam-blocked aromatic isocyanates. / Subramani, S.; Cheong, I. W.; Kim, Jung-Hyun.

In: Progress in Organic Coatings, Vol. 51, No. 4, 20.12.2004, p. 328-338.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chain extension studies of water-borne polyurethanes from methyl ethyl ketoxime/ε-caprolactam-blocked aromatic isocyanates

AU - Subramani, S.

AU - Cheong, I. W.

AU - Kim, Jung-Hyun

PY - 2004/12/20

Y1 - 2004/12/20

N2 - A series of water-based blocked aromatic polyurethane dispersions (BPUDs) were prepared by prepolymer mixing process, using toluene 2,4-diisocyanate (TDI), 4,4′-di-p-phenylmethane diisocyanate (MDI), poly (oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA), methyl ethyl ketoxime (MEKO) and ε-caprolactam (CL). Particle size, viscosity, pH, molecular weight, storage stability, and deblocking temperature of the BPUDs were measured and compared. Chain extension of BPUD was carried out with three types of chain extenders, hexamethylene diamine (HMDA), isophorone diamine (IPDA) and tetraethylene pentamine (TEPA), at various de-blocking temperatures. Tensile and thermal properties of the chain extended BPUD films were investigated and results confirmed that MEKO-BPUDs de-blocked at lower temperature than ε-caprolactam-BPUDs. The Tg values of the chain extended BPUDs were higher than those of the BPUDs and pure PTMG. Improvement in the thermal stability confirmed the de-blocking and chain extension reaction of blocked PU prepolymers.

AB - A series of water-based blocked aromatic polyurethane dispersions (BPUDs) were prepared by prepolymer mixing process, using toluene 2,4-diisocyanate (TDI), 4,4′-di-p-phenylmethane diisocyanate (MDI), poly (oxytetramethylene) glycol (PTMG), dimethylol propionic acid (DMPA), methyl ethyl ketoxime (MEKO) and ε-caprolactam (CL). Particle size, viscosity, pH, molecular weight, storage stability, and deblocking temperature of the BPUDs were measured and compared. Chain extension of BPUD was carried out with three types of chain extenders, hexamethylene diamine (HMDA), isophorone diamine (IPDA) and tetraethylene pentamine (TEPA), at various de-blocking temperatures. Tensile and thermal properties of the chain extended BPUD films were investigated and results confirmed that MEKO-BPUDs de-blocked at lower temperature than ε-caprolactam-BPUDs. The Tg values of the chain extended BPUDs were higher than those of the BPUDs and pure PTMG. Improvement in the thermal stability confirmed the de-blocking and chain extension reaction of blocked PU prepolymers.

UR - http://www.scopus.com/inward/record.url?scp=10044220572&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=10044220572&partnerID=8YFLogxK

U2 - 10.1016/j.porgcoat.2004.08.004

DO - 10.1016/j.porgcoat.2004.08.004

M3 - Article

AN - SCOPUS:10044220572

VL - 51

SP - 328

EP - 338

JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

SN - 0033-0655

IS - 4

ER -