PMMA solution (60 mg mL1) was prepared by dissolving 1.2 g
PMMA in 20 mL DMF at 50 C. Then, a controlled amount of BPO
was  dissolved  in  the  PMMA  solution  at  room  temperature  to
prepare  a  BPO/PMMA  blended  solution  (the  concentration  of
BPO = 0.05, 0.1, 0.2, or 0.3 M)
                             ~~~~就是这个M是什么意思？

谢谢
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修改:ScoDK FROM 211.99.222.*
FROM 211.99.222.*