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Fragrance is a commonly used substance in a number of commercial products, and fine control over the release behavior of the fragrance is essential for its successful application. Understanding the release behavior of the fragrance is the key to realizing the control of its release. Herein, we use tobacco leaf as the model substrate and investigate the mechanism of eugenol release from tobacco leaf. Our results show that interaction between eugenol and tobacco leaf is weak physical adsorption, and the eugenol release from tobacco leaf substrate is a temperature-dependent process. Further analysis on the release behavior reveals that eugenol release is closely associated with the morphology change of tobacco leaves under heating conditions. Our results provide insight into the release mechanism of fragrance from polymer substrate and may be useful for the future design of fragrance release systems. [ABSTRACT FROM AUTHOR]

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We describe an approach to form stimuli-responsive pressure-sensitive adhesive (PSA) films that are activated by thermal energy. This approach is used to form films that do not adhere on contact to any non-adhesive substrates. However, upon activation using heat as a stimulus, the films change irreversibly into PSA coatings. In order to develop this system, a PSA polymer emulsion stabilized by a novel low-molecular-weight polymeric stabilizer was synthesized. This emulsion was dried at ambient conditions to form films with a well-defined morphology with the PSA encapsulated by a protective matrix of polymeric stabilizer. This morphology is not thermodynamically stable and is disrupted when the temperature is elevated above the glass transition temperature of the protective polymeric stabilizer. Thermodynamically-driven rearrangement of the phases leads to the PSA migrating to and occupying the air–film interface. The impact of the amount and composition of the stabilizer in the PSA emulsion on emulsion stability, latency and stimulus response was explored. Supporting data for the proposed mechanism include TEM micrographs of the film morphology. [ABSTRACT FROM AUTHOR]