From Korea

From: Á¶ ÀÎÈ£ (inhoy2k@yahoo.co.kr)
Date: Fri Nov 05 1999 - 16:09:13 EET


Dear sir

 I have been taking the experiments , using SLA 250
and Cibatool SL5170 resin
 I am In Ho Cho , BA candidate , Pusan National
University in Korea .
 Can I ask questionare about the resin ?
 1. When I pour SL 5170 resin on the hydrophillic
surface ,
    I found that the wettability is better than on
the hydrophobic surface .
    So I thoght the resin character is hydrophillic .

    what the components in the 5170 resin make such a
phenomon ?
    whtat are the wettability characters of the
SL5170 resin ?
    Is it true that SL 5170 is more wettable on the
hydrophillic than hyrophobic surface ?
 
 2. Whenever spining the resin on the hyrophillic
surface ,
     many fine bubble were found in thinly-spun-on
resin .
     above method is simillar to the spin coating
usually used in the PR spin coating
     How do you think I coud deal with fine bubble
problem ?
     I don't know why the many fine bubble forms in
the resin ,
     though I didn't find any of bubbls in the resin
before spining on .
     I tried many experiments to remove the bubbles.
       - to decrease the viscousity ,
           A. 5 % methylalcohol added in the resin
           B. heating the resin
           C. One more trial was done .
               Heating and swirling the resin to
remove the intrinsic resin .
              Such a trial seemed like so effective .
              but after spin coating the resin ,
cooled resin formed fine bubbles again.
     These 3 trials is no benifit to remove the bubble
    
     Finally I expected the anwer to remove the
bubble is in the resin .
3. Can I get the thermal properties of the SL resin
especially 5170 resin .

Pease , anwer all the question .
Please , if not possible , show me the another way to
solve the problem.
Thank you .
 Sincerely
    In Ho Cho

=====

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