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

S. Subramani; I. W. Cheong; J. H. Kim

doi:10.1016/j.porgcoat.2004.08.004

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

S. Subramani, I. W. Cheong, J. H. Kim

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

20 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 T_g 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 language	English
Pages (from-to)	328-338
Number of pages	11
Journal	Progress in Organic Coatings
Volume	51
Issue number	4
DOIs	https://doi.org/10.1016/j.porgcoat.2004.08.004
Publication status	Published - 2004 Dec 20

Bibliographical note

Funding Information:
This research was supported by the Korea Institute of Science and Technology Evaluation and Planning (National Research Laboratory Program, Project No. M19911000044).

All Science Journal Classification (ASJC) codes

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

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10.1016/j.porgcoat.2004.08.004

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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.",

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note = "Funding Information: This research was supported by the Korea Institute of Science and Technology Evaluation and Planning (National Research Laboratory Program, Project No. M19911000044).",

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AU - Cheong, I. W.

AU - Kim, J. H.

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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.

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

Abstract

Bibliographical note

All Science Journal Classification (ASJC) codes

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