Review

60 KKU Science Journal Volume 39 Number 1 Review
R-O:M
O
-
+ O
O
R
O
O
O
O
-
O:M
O
lactide
R
O
√Ÿª∑’Ë 9 ªØ‘°‘√‘¬“æÕ≈‘‡¡Õ‰√‡´—π·∫∫‡ªî¥«ß·À«π·∫∫‰ÕÕÕπ≈∫ (anionic ring-opening polymerization) ¢Õß
·≈§‰∑¥å (∑’Ë¡“: Gupta and Kumar, 2007)
O
O
n
O
-
O:M
µ—«Õ¬à“ߢÕßµ—«‡√àߪؑ°‘√‘¬“ (catalyst) ¢Õß
°√–∫«π°“√æÕ≈‘‡¡Õ‰√‡´—π·∫∫‡ªî¥«ß·À«π·∫∫
‰ÕÕÕπ∫«° ‰¥â·°à borontrifluoride ·≈– trifluoroacetic
acid (Tang et al., 2003) ¥—ß· ¥ß„π√Ÿª∑’Ë 10 ¢âÕ‡ ’¬
∑’Ë ”§—≠¢Õß°√–∫«π°“√π’È §◊Õ ∑”„À₧√ß·∫∫¢Õß
·≈§‰∑¥å‡ª≈’ˬπ·ª≈߉¥âßà“¬∑’ËÕÿ≥À¿Ÿ¡‘ Ÿß ·µà‡¡◊ËÕ≈¥
Õÿ≥À¿Ÿ¡‘°“√ —߇§√“–Àå≈ß®–∑”„ÀâÕ—µ√“°“√‡°‘¥
ªØ‘°‘√‘¬“â“≈ß (Wang et al., 2004)
O
+
F 3 CSO 3 CH 3 +
O
O
O
OCH 3
F 3 C-SO 3
-
O
+
O
O
OCH 3
O
O
O
O
O
+
O
O
O
O
+
O
O
O
O
OCH 3
O
√Ÿª∑’Ë 10 ªØ‘°‘√‘¬“æÕ≈‘‡¡Õ‰√‡´—π·∫∫‡ªî¥«ß·À«π·∫∫‰ÕÕÕπ∫«° (cationic ring-opening polymerization) ¢Õß
·≈§‰∑¥å (∑’Ë¡“: Gupta and Kumar, 2007)
”À√—∫°√–∫«π°“√æÕ≈‘‡¡Õ‰√‡´—π·∫∫
‡ªî¥«ß·À«π·∫∫‚§ÕÕ√契‡π—π-°“√·∑√° ‡ªìπ
°√–∫«π°“√∑’Ë„â„π°“√ —߇§√“–ÀåæÕ≈‘·≈§‰∑¥å
„πªí®®ÿ∫—π¡“°∑’Ë ÿ¥ ‚¥¬∑—Ë«‰ª„â√–∫∫‡√‘Ë¡ªØ‘°‘√‘¬“
(initiating systems) ∑’˪√–°Õ∫¥â«¬ “√ª√–°Õ∫
‰Œ¥√Õ°´’≈ (hydroxyl compounds) ·≈– “√
ª√–°Õ∫‚≈À–Õ‘π∑√’¬å (organometallic compounds)
‚¥¬ “√ª√–°Õ∫‚≈À–Õ‘π∑√’¬å∑’Ë¡’°“√„â¡“°∑’Ë ÿ¥ §◊Õ
·µππ— ÕÕ°‚∑‡Õ∑ (stannous octoate, Sn(Oct) 2
) ∑’Ë
¡’◊ËÕ„π√–∫∫ IUPAC «à“ tin (II)-bis-2-ethylhexanoate
´÷Ëß¡’‚§√ß √â“ß∑“߇§¡’¥—ß· ¥ß„π√Ÿª∑’Ë11 ‡π◊ËÕß®“°‡ªìπ
“√ª√–°Õ∫‚≈À–Õ‘π∑√’¬å∑’ˉ¥â√—∫°“√Õπÿ≠“µ®“°
Õߧ尓√Õ“À“√·≈–¬“ª√–‡∑» À√—∞Õ‡¡√‘°“ (Food and
Drug Administration, FDA) ”À√—∫„⇪ìπ à«πº ¡
„πº≈‘µ¿—≥±åÕ“À“√·≈–¬“‰¥â (Stridsberg et al., 2002)