Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2024 Sep 9;14(1):21018.
doi: 10.1038/s41598-024-72053-3.

A facile strategy for synthesizing isosorbide-based polyurethane structural adhesives and core-shell rubber

Jin-Gyu Min  1 , Won-Bin Lim  1 , Ju-Hong Lee  1 , Jae-Ryong Lee  1 , Ji-Hong Bae  2 , PilHo Huh  3
Affiliations

A facile strategy for synthesizing isosorbide-based polyurethane structural adhesives and core-shell rubber

Jin-Gyu Min et al. Sci Rep. .

Abstract

A structural adhesive series of biomass-based polyurethane (Biomass-PU) is synthesized using polypropylene glycol (PPG2000), isosorbide-based polyol (RPO300) as polyols, isophorone diisocyanate (IPDI) as an isocyanate and 4-tert-butylphenol (BP) as a capping agent. Three different equivalent ratios of PPG2000/RPO300, 9/1 (Biomass-PU1), 7/3 (Biomass-PU2), and 1/1 (Biomass-PU3), are evaluated to determine the effect of isosorbide-based polyol content on the properties and the optimizing formulation of biomass-PU structure adhesive. The 9/1 ratio of PPG2000/RPO300 substantially leads to the improvement of impact strength by up to 35 MPa, and the PPG2000/RPO300 = 9/1 ratio exhibits better thermal properties and impact strength than those of other ratios. To achieve more compatibility between biomass-PU structure adhesive and core-shell rubber (CSR) toughener, novel CSRs are successfully synthesized using acryl-PU as a shell and biomass-based PU as a core. The chemical structure of biomass-PU structure adhesives is analyzed through FT-IR Spectroscopy and NCO% titration. Thermal properties are evaluated using TGA and DSC analysis. Their molecular weights are measured by GPC. Also, the core-shell rubber (CSR) with a polyurethane shell is prepared to reinforce the impact strength of Biomass-PU structure adhesive.

PubMed Disclaimer

Conflict of interest statement

The authors declare no competing interests.

Figures

Fig. 1
Fig. 1
FT-IR result of synthesized biomass-based polyurethane.
Fig. 2
Fig. 2
Thermal properties of biomass-based polyurethane. (A) TGA curves / (B) DSC curves.
Fig. 3
Fig. 3
Shear strength and impact strength of biomass-based polyurethane.
Fig. 4
Fig. 4
FE-SEM measurement results by drying method in CSR Fig. 7. (A) spray-drying (50 μm), (B) oven-drying (1 μm), (C) freeze-drying (1 μm).
Fig. 5
Fig. 5
FE-SEM image after spray drying of CSR polymerization series. (A) petroleum PUA as a shell type / (B) isosorbide-based PU as a core type.
Fig. 6
Fig. 6
Thermal properties of CSR polymerization series. (A) petroleum PUA as a shell type / (B) isosorbide-based PU as a core type.
Fig. 7
Fig. 7
A synthetic procedure for Ref. CSR.
Fig. 8
Fig. 8
A synthetic procedure for novel CSRs (A) involves using petroleum PUA as a shell and (B) isosorbide-based PU as a core.
Fig. 9
Fig. 9
Biomass-based polyurethane synthesis.
See this image and copyright information in PMC

References

    1. Baek, D. Y., Sim, K. B. & Kim, H. J. Mechanical characterization of core-shell rubber/epoxy polymers for automotive structural adhesives as a function of operating temperature. Polymers13, 734. 10.3390/polym13050734 (2021). 10.3390/polym13050734 - DOI - PMC - PubMed
    1. Lee, H. R. et al. The effect of nano functionalized block copolymer addition on the joint strength of structural epoxy adhesive for car body assembly. J. Weld. Join.33, 44–49. 10.5781/JWJ.2015.33.4.44 (2015).10.5781/JWJ.2015.33.4.44 - DOI
    1. Kim, D. Y. et al. Effect of molecular weight of polyurethane toughening agent on adhesive strength and rheological characteristics of automotive structural adhesives. Int. J. Adhes. Adhes.74, 21–27. 10.1016/j.ijadhadh.2016.12.006 (2017).10.1016/j.ijadhadh.2016.12.006 - DOI
    1. Ruan, M., Luan, H., Wang, G. & Shen, M. Bio-polyols synthesized from bio-based 1,3-propanediol and applications on polyurethane reactive hot melt adhesives. Ind. Crops Prod.128, 436–444. 10.1016/j.indcrop.2018.11.045 (2019).10.1016/j.indcrop.2018.11.045 - DOI
    1. Borrero-López, A. M. et al. Toward UV-triggered curing of solvent-free polyurethane adhesives based on castor oil. ACS Sustain. Chem. Eng.9, 11032–11040. 10.1021/acssuschemeng.1c02461 (2021).10.1021/acssuschemeng.1c02461 - DOI

LinkOut - more resources