Abstract:
MDI based polyurethanes have vast variety
of applications. Its applications will be broaden with an
understanding of the microstructural changes in the
polymer matrix due to UV exposure. In this study the
fluorescence analysis has been used to uncover the
microstructural changes of polymer matrix in a UV
environment. When this polymer is exposed to UV
radiation hard segments crystallize and the process is
assisted localized melting. When the UV exposure was
ceased molecules re-arrange back to their initial
structure due to the tensile forces originating from softsegment
crystallization. However, tensile forces are not
strong enough for a complete recovery of the micro
structure. Residual solvent molecules can also disturb
the recovery.
