Thermal and Dynamic Mechanical Properties of Hydroxypropyl Cellulose Films
نویسنده
چکیده
DifI'..tial scanning calorimetry (~ and dynamic ~-,!jCaJ thermal analysis (DMTA) were used to characterize the morphology of eolv81t cast hydroXYPl'Opyl ceUuloee (Hpc) films. DSC r-.lta windicative of a aemicryltaUine mat«ial with a melt at 220°C and a ,tran8itioo at 19°C (T1). althoucb an 8dditiCXlal _t wu MIumted by a baseline inftectioo at about ~C (Tt). Cc pcx1din, relaxatiMS wfound by DMTA. A 8eCOOdary relaxatioo at 55°C wu attributed to the interaction betw-. hydroxyl croups of the poIyJDS' and rBduaI dilu81t. The tan 3 peek at Tz wea found to arise &om an organited phue, prelUmably from a liquid-cryatal m8OPhale fonDed while in solution. Cro88Iinking with a diiIOCyanate increesed the peak telupwatwe of the two IKimary relaxatiooa, and ~ted in a mwe dearly d£ned peak fCM' the Tt tranaitioo. Frun this bellavior it wu cooclud«i that ooth T1 and Tz are 8iDilar to,tran8itiona (T.'s) a81ciated with an amorph0\8 compon81t and a more highly ordered phase (due to a r8idualliquid crystal su~cture) in the HPC bulk.
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