Polymer glass transition temperature manipulation via z/e hydrazone photoswitching
AssigneeTrustees of Dartmouth College
InventorsIvan Abrahamian, Sirun Yang, Laura L. Jeliazkov, Jared D. Harris
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Abstract
In an embodiment, the present disclosure pertains to a method of changing the glass transition temperature of a polymer. In some embodiments, the polymer includes at least one hydrazone-containing compound. In general, the methods of the present disclosure include one or more of the following steps of: (1) applying light to the polymer; and (2) thereby changing the glass transition temperature of the polymer. In another embodiment, the present disclosure pertains to a polymer having a light-adjustable glass transition temperature. In some embodiments, the polymer includes at least one hydrazone-containing compound.
Claims18
A method of increasing the glass transition temperature (Tg) of a polymer,
- wherein the polymer is covalently linked to at least one hydrazone-containing compound,
- wherein the hydrazone-containing compound comprises:
- or combinations thereof,
- wherein at least one of Y and R1 comprises the polymer,
- wherein Y, R1 and R2 are each independently selected from the group consisting of H, alkyl groups, alkenyl groups, alkoxy groups, aryl groups, ketone groups, amine groups, amide groups, carboxyl groups, carboxylic acid groups, ester groups, thiol groups, sulfoxide groups, alcohol groups, alkyne groups, azide groups, CH2CH3, C(CH3), (CH2)5CH3, (CH2)7CH3, (CH2)9CH3, (CH2)11CH3, (CH2)1-20CH3, t-butyl, n- hexyl, n-octyl, n-decyl, n-dodecyl and combinations thereof, and
- wherein the method comprises:
- applying light to the polymer,
- wherein the light increases the glass transition temperature (Tg) of the polymer,
- wherein the increase in Tg occurs through photo-isomerization, and
- wherein the hydrazone in the hydrazone-containing compound transitions from a Z state to an E state upon photoisomerization.
A polymer comprising a light-adjustable glass transition temperature (Tg), wherein the polymer is covalently linked to at least one hydrazone-containing compound, wherein the hydrazone-containing compound comprises:
- or combinations thereof,
- wherein at least one of Y and R1 comprises the polymer,
- wherein Y, R1 and R2 are each independently selected from the group consisting of H, alkyl groups, alkenyl groups, alkoxy groups, aryl groups, ketone groups, amine groups, amide groups, carboxyl groups, carboxylic acid groups, ester groups, thiol groups, sulfoxide groups, alcohol groups, alkyne groups, azide groups, CH2CH3, C(CH3), (CH2)5CH3, (CH2)7CH3, (CH2)9CH3, (CH2)1-20CH3, (CH2)1-20CH3, t-butyl, n- hexyl, n-octyl, n-decyl, and n-dodecyl and combinations thereof, and
- wherein the hydrazone in the hydrazone-containing compound is operational to transition from a Z state to an E state upon photoisomerization.
Dependencies are inferred from the claim text.