Glass transition temperatures of hydrocarbon blends: Adhesives measured by differential scanning calorimetry and dynamic mechanical analysis

✍ Scribed by Adam S. Cantor

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 153 KB
• Volume: 77
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(20000725)77:4<826::aid-app16>3.0.co;2-7

✦ Synopsis

A comparison of calculated and measured glass transition temperatures of a series of three-component hydrocarbon blends was performed. The blends were prepared as mixtures of an elastomer with different proportions of tackifying resin and oil. Glass transition temperature, T g , was measured by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) at four measurement frequencies. Most of these blends had pressure-sensitive adhesive (PSA) properties, and were used to prepare a series of PSA tapes. The adhesion of the PSA tapes was shown to be strongly dependent on T g . Tack of PSA tapes was measured at two different temperatures, and shown to be directly correlated to the blend T g . Several predictive methods for blend T g that are based on individual component T g s were evaluated. The prediction of blend T g is far more accurate if the individual component T g values are determined by DMA instead of DSC. In addition, the Gordon-Taylor equation gave a significant improvement on predicted blend T g when compared to the Fox equation.