Review
Review
Review
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62 KKU Science Journal Volume 39 Number 1 <strong>Review</strong><br />
(a)<br />
Sn(Oct) 2<br />
+ R-OH<br />
OctSn-OR + OctH<br />
Stannous octoate Hydroxy compound Stannous alkoxide<br />
O<br />
(b)<br />
OctSn-OR<br />
+<br />
n<br />
O<br />
O<br />
ROP<br />
OctSn<br />
O<br />
O-CH-C<br />
CH 3<br />
OR<br />
2n<br />
Stannous alkoxide<br />
O<br />
Lactide<br />
Poly(lactide)<br />
√Ÿª∑’Ë 13 ªØ‘°‘√‘¬“æÕ≈‘‡¡Õ‰√‡´—π·∫∫‡ªî¥«ß¢Õß·≈§‰∑¥å‚¥¬„â ·µππ— ÕÕ°‚∑‡Õ∑·≈– “√ª√–°Õ∫‰Œ¥√Õ°´‘≈<br />
‡ªìπ√–∫∫‡√‘Ë¡ªØ‘°‘√‘¬“ ‚¥¬°“√‡°‘¥ ·µππ— Õ—≈§Õ°‰´¥å (a) ¢—ÈπµÕπ°“√‡°‘¥ ·µππ— Õ—≈§Õ°‰´¥å ·≈–<br />
(b) ¢—ÈπµÕπ°“√‡ªî¥«ß·À«π¢Õß·≈§‰∑¥å (∑’Ë¡“: Dechy-Cabaret et al., 2004)<br />
¡∫—µ‘∑“ߧ«“¡√âÕπ¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥<br />
”À√—∫ PLLA ·≈– PDLA ‡ªìπæÕ≈‘‡¡Õ√å<br />
°÷Ëߺ≈÷° (semi-crystalline polymers) ∑’Ë¡’§à“Õÿ≥À¿Ÿ¡‘<br />
°“√À≈Õ¡ (melting temperatures, T m<br />
) Õ¬Ÿà„πà«ß<br />
ª√–¡“≥ 170-180 Õß»“‡´≈‡´’¬ ·≈–¡’§à“Õÿ≥À¿Ÿ¡‘°“√<br />
‡ª≈’ˬπ ∂“π–§≈⓬·°â« (glass-transition temperature,<br />
T g<br />
) Õ¬Ÿà„πà«ßª√–¡“≥ 60 - 65 Õß»“‡´≈‡´’¬ ¢≥–∑’Ë<br />
PDLLA ‡ªìπæÕ≈‘‡¡Õ√åÕ —≥∞“π (amorphous<br />
polymer) ‰¡à¡’§«“¡‡ªìπº≈÷° ®÷߉¡àª√“°Ø§à“ T m<br />
‚¥¬<br />
¡’§à“ T g<br />
Õ¬Ÿà„πà«ßª√–¡“≥ 50-60 Õß»“‡´≈‡´’¬<br />
(Maharana et al., 2009) ‚¥¬§à“ T g<br />
·≈– T m<br />
¢Õß<br />
æÕ≈‘·≈§µ‘°·Õ´‘¥®–¡’§à“¡“°¢÷Èπ ‡¡◊ËÕ§«“¡¬“«¢Õß<br />
‚¡‡≈°ÿ≈ À√◊ÕπÈ”Àπ—°‚¡‡≈°ÿ≈¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥<br />
‡æ‘Ë¡¢÷Èπ<br />
¡∫—µ‘°“√≈–≈“¬¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥<br />
§«“¡ “¡“√∂„π°“√≈–≈“¬ (solubility) „π<br />
µ—«∑”≈–≈“¬Õ‘π∑√’¬å¢Õß PLLA ·≈– PDLLA · ¥ß<br />
„πµ“√“ß∑’Ë 1 ‚¥¬ PDLA ®–¡’§«“¡ “¡“√∂„π°“√<br />
≈–≈“¬‡àπ‡¥’¬«°—π°—∫ PLLA ®“°µ“√“ß∑’Ë 1 æ∫«à“<br />
PDLLA “¡“√∂≈–≈“¬„πµ—«∑”≈–≈“¬Õ‘π∑√’¬å‰¥â<br />
À≈“¬π‘¥¡“°°«à“ PLLA ‡π◊ËÕß®“°§«“¡‡ªìπº≈÷°¢Õß<br />
PLLA ∑”„Àâ “¡“√∂≈–≈“¬„πµ—«∑”≈–≈“¬Õ‘π∑√’¬å<br />
µà“ßʉ¥âπâÕ¬°«à“ PDLLA