If I prepare thin films of atactic and isotactic PMMA by spin-coating method and measure contact angles of deionized water on these films under room condition, are the contact angles of these two samples the same or different?
Dear Chi Pui Jeremy Wong,
I googled the title of your question and I came across the following book from Google Books:
Polymer Interface and Adhesion:
http://www.crcpress.com/product/isbn/9780824715335
http://books.google.gr/books?id=tXNgrCbsCfIC&pg=PA209&lpg=PA209&dq=Surface+tension+of+PMMA+with+different+tacticities&source=bl&ots=YL_9G7mSZ1&sig=snJfb_FJceIKQKFsAygMsjbETVM&hl=el&sa=X&ei=iPDQU6b3HqfnywOe04KQCw&ved=0CCsQ6AEwAg
I quote from page 211:
[...] The effect of tacticity on surface tension has not been investigated adequately. Any effect is expected to arise from the density effect. Very small differences in the gamma_c of some polymethacrylates of different tacticity has been reported [81].
Reference 81 is what you need:
http://www.sciencedirect.com/science/article/pii/0021979774903105
Good luck.
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