The Properties of Reactive Hot Melt Polyurethane Adhesives: Effects of Molecular Weight and Reactive Organoclay

Kim, Tae Kyoon; Kim, Byung Kyu; Kim, Yong‐Sung; Cho, Yang Lae; Lee, Sang-Yun; Cho, Youn Bok; Jeong, Han Mo

doi:10.1080/03602550902995034

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Figure 6 presents the DSC curves of the rosin‐based PURHMAs, and it can be found that the crystallization temperature ( T c ) values of the PURHMAs exhibits a gradually decreasing trend: PURHMA 0 (55.2°C) > PURHMA 0.2 (53.4°C) > PURHMA 0.4 (49.8°C) > PURHMA 0.6 (44.6°C). With the increase of chain extender content, the disorder of the PU molecular chain increases with the length of molecular chain, which results in decreasing crystallization performance and the T c of the PURHMAs 34 . In addition, the area of the endothermic peak also shows a decreasing trend as content of chain extender increases, conforming to T c results.…”

Section: Resultssupporting

confidence: 73%

Study on novel rosin‐based polyurethane reactive hot melt adhesive

Xie

2021

Polymers for Advanced Techs

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Chain extender is a major additive in polyurethane adhesive preparation, which has a great influence on its molecular weight, green strength, and thermal resistance. In this work, we first synthesized a novel rosin‐based chain extender to replace conventional petroleum derived ones due to rosin was a renewable and low cost natural material. Afterward, the as‐prepared rosin‐based chain extender reacted with the isocyanate‐terminated polyurethane prepolymer to prepare polyurethane reactive hot melt adhesive (PURHMA). Rosin contains rigid hydrophenanthrene ring, which may have good effect on the thermal and mechanical properties of PURHMA. Consequently, the characterization of the thermal and physical properties of sustainable PURHMA was made using differential scanning calorimetry, X‐ray diffraction, dynamic mechanical thermal analyzer, as well as thermogravimetric analysis. Eventually, the adhesion performance of PURHMA on wood substrates were investigated by adjusting the amount of rosin‐based chain extender in the adhesive system. It was found that with the increase of the chain extender content, the thermal resistance, mechanical property, and adhesion property of PURHMA were significantly improved. The tensile strength of adhesive joints increased from 4.15 to 15.53 MPa, and the ultimate lap shear strength increased from 5.76 to 8.92 MPa. More strikingly, the rosin‐based PURHMA exhibited excellent bonding strength even after aging in water (less than 18%).

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Section: Resultssupporting

confidence: 73%

Study on novel rosin‐based polyurethane reactive hot melt adhesive

Xie

2021

Polymers for Advanced Techs

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“…62 In that case, the heavy reduction of the matrix crosslinking degree displayed by the composites filled by the most hydrophilic clays (Cloisite Õ 30B) was ascribed to the strong polymer-filler interfacial interaction that led to the absorption of high amounts of chain extender in the intragallery spaces, with detrimental effects on the crosslinking kinetics of the material. Also, Kim et al 76 studying the effect of molecular weight on the adhesion properties of polyurethane/ lamellar silicate nanocomposites, found that the crosslinking of the PU matrix was reduced by the presence of Cloisite Õ 30B clay. They hypothesized that the increased viscosity of the nanofilled systems might be a cause of this decreased crosslinking degree.…”

Section: Resultsmentioning

confidence: 99%

Effect of the polymer—filler interaction on the thermo-mechanical response of polyurethane-clay nanocomposites from blocked prepolymer

Dorigato

Pegoretti

Penati

2011

Journal of Reinforced Plastics and Composites

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nanocomposites from blocked prepolymer filler interaction on the thermo-mechanical response of polyurethane-clay −− Effect of the polymerPublished by: http://www.sagepublications.com can be found at: Journal of Reinforced Plastics and Composites Additional services and information forAbstract Thin transparent films of polyurethane-clay nanocomposites were prepared by dispersing different amounts of commercial organo-modified clay in a mixture of cycloaliphatic amines used as chain extender of a blocking prepolymer, in order to investigate the role of the filler content on the thermo-mechanical behavior of the resulting composites. X-ray diffraction measurements evidenced the formation of an intercalated structure, regardless to the clay loading. Furthermore, the optical clarity of the samples was not substantially compromised by the nanofiller addition even at elevated clay amounts. Interestingly, the relatively strong polymer-filler interaction led to a substantial reduction of the matrix crosslinking degree for high clay loadings. Consequently, the relative thermal lifetime was positively affected by the presence of clay up to a filler content of 7 wt%, while uniaxial tensile tests under quasi-static and impact conditions evidenced an increase of the elastic modulus proportional to the clay concentration, without impairing the original tensile properties at break.

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