Abstract
Honeycomb-patterned films were prepared with novel cellulosic macroinitiators. Both regiochemistry and degree of substitution (DS) were found to dramatically affect the ability to form honeycomb films. 3-O-(2-bromoisobutyryl)-2,6-TDMS-O-cellulose did not produce uniform honeycomb-patterned films, while 2,3-O-(2-bromoisobutyryl)-2,6-TDMS-O-cellulose was able to form honeycomb-patterned films with a narrow distribution of pore sizes of around 1 µm. Poly(N-isopropylacrylamide) (pNIPAm) was grafted from the surface of these films with different degrees of polymerization (DP) by surface-initiated atom transfer radical polymerization (ATRP) and it was found that the pNIPAm DP had a significant impact on the morphology of the films. At high DP, the films exhibited very hydrophilic surfaces at room temperature, however the honeycomb-patterned was lost. At lower DPs, the honeycomb pattern was maintained and the surface hydrophobicity/hydrophilicity was tailored by manipulating the DP. However, the pore size distribution of the modified surface varied between 0.4 to 1 µm, likely due to poor control of the polymerization process.
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