Effect of molecular weight of polyurethane toughening agent on adhesive strength and rheological characteristics of automotive structural adhesives

Daeyeon Kim; Dong Geun Lee; Jin Chul Kim; Choong Sun Lim; Nam Sik Kong; Jin Hong Kim; Hyun Wook Jung; Seung Man Noh; Young Il Park

doi:10.1016/j.ijadhadh.2016.12.006

Effect of molecular weight of polyurethane toughening agent on adhesive strength and rheological characteristics of automotive structural adhesives

Daeyeon Kim, Dong Geun Lee, Jin Chul Kim, Choong Sun Lim, Nam Sik Kong, Jin Hong Kim, Hyun Wook Jung, Seung Man Noh, Young Il Park

Department of Chemical and Biological Engineering

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

18 Citations (Scopus)

Abstract

Rheological and adhesive properties of automotive structural adhesives including polyurethane (PU) toughening agents have been investigated by adjusting the molar ratio of polytetrahydrofuran (polyTHF) and hexamethylene diisocyanate (HMDI) for the control of molecular weight of a PU prepolymer. Thixotropic behavior, crosslinking characteristics, and lap-shear and T-peel adhesion strengths for various adhesives were significantly affected by single or binary-mixed PUs with different molecular weights. Thixotropic hysteresis loop of shear viscosity along with shear rate of an adhesive became larger with increasing PU molecular weight, exhibiting favorable flowability, however, the adhesion strengths were not satisfactory for injection and coating applications. We found that both rheological and adhesive properties of adhesives could be interestingly tuned by combining PU components with different molecular weights.

Original language	English
Pages (from-to)	21-27
Number of pages	7
Journal	International Journal of Adhesion and Adhesives
Volume	74
DOIs	https://doi.org/10.1016/j.ijadhadh.2016.12.006
Publication status	Published - 2017 Apr 1

Keywords

Adhesion strength
Lap-shear strength
Polyurethane
Rheology
Structural adhesive
Thixotropic

ASJC Scopus subject areas

Biomaterials
Chemical Engineering(all)
Polymers and Plastics

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10.1016/j.ijadhadh.2016.12.006

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Kim, D., Lee, D. G., Kim, J. C., Lim, C. S., Kong, N. S., Kim, J. H., Jung, H. W., Noh, S. M., & Park, Y. I. (2017). Effect of molecular weight of polyurethane toughening agent on adhesive strength and rheological characteristics of automotive structural adhesives. International Journal of Adhesion and Adhesives, 74, 21-27. https://doi.org/10.1016/j.ijadhadh.2016.12.006

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abstract = "Rheological and adhesive properties of automotive structural adhesives including polyurethane (PU) toughening agents have been investigated by adjusting the molar ratio of polytetrahydrofuran (polyTHF) and hexamethylene diisocyanate (HMDI) for the control of molecular weight of a PU prepolymer. Thixotropic behavior, crosslinking characteristics, and lap-shear and T-peel adhesion strengths for various adhesives were significantly affected by single or binary-mixed PUs with different molecular weights. Thixotropic hysteresis loop of shear viscosity along with shear rate of an adhesive became larger with increasing PU molecular weight, exhibiting favorable flowability, however, the adhesion strengths were not satisfactory for injection and coating applications. We found that both rheological and adhesive properties of adhesives could be interestingly tuned by combining PU components with different molecular weights.",

keywords = "Adhesion strength, Lap-shear strength, Polyurethane, Rheology, Structural adhesive, Thixotropic",

author = "Daeyeon Kim and Lee, {Dong Geun} and Kim, {Jin Chul} and Lim, {Choong Sun} and Kong, {Nam Sik} and Kim, {Jin Hong} and Jung, {Hyun Wook} and Noh, {Seung Man} and Park, {Young Il}",

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AU - Kim, Daeyeon

AU - Lee, Dong Geun

AU - Kim, Jin Chul

AU - Lim, Choong Sun

AU - Kong, Nam Sik

AU - Kim, Jin Hong

AU - Jung, Hyun Wook

AU - Noh, Seung Man

AU - Park, Young Il

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AB - Rheological and adhesive properties of automotive structural adhesives including polyurethane (PU) toughening agents have been investigated by adjusting the molar ratio of polytetrahydrofuran (polyTHF) and hexamethylene diisocyanate (HMDI) for the control of molecular weight of a PU prepolymer. Thixotropic behavior, crosslinking characteristics, and lap-shear and T-peel adhesion strengths for various adhesives were significantly affected by single or binary-mixed PUs with different molecular weights. Thixotropic hysteresis loop of shear viscosity along with shear rate of an adhesive became larger with increasing PU molecular weight, exhibiting favorable flowability, however, the adhesion strengths were not satisfactory for injection and coating applications. We found that both rheological and adhesive properties of adhesives could be interestingly tuned by combining PU components with different molecular weights.

KW - Adhesion strength

KW - Lap-shear strength

KW - Polyurethane

KW - Rheology

KW - Structural adhesive

KW - Thixotropic

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Effect of molecular weight of polyurethane toughening agent on adhesive strength and rheological characteristics of automotive structural adhesives

Abstract

Keywords

ASJC Scopus subject areas

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