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62 KKU Science Journal Volume 39 Number 1 <strong>Review</strong> (a) Sn(Oct) 2 + R-OH OctSn-OR + OctH Stannous octoate Hydroxy compound Stannous alkoxide O (b) OctSn-OR + n O O ROP OctSn O O-CH-C CH 3 OR 2n Stannous alkoxide O Lactide Poly(lactide) √Ÿª∑’Ë 13 ªØ‘°‘√‘¬“æÕ≈‘‡¡Õ‰√‡´—π·∫∫‡ªî¥«ß¢Õß·≈§‰∑¥å‚¥¬„â ·µππ— ÕÕ°‚∑‡Õ∑·≈– “√ª√–°Õ∫‰Œ¥√Õ°´‘≈ ‡ªìπ√–∫∫‡√‘Ë¡ªØ‘°‘√‘¬“ ‚¥¬°“√‡°‘¥ ·µππ— Õ—≈§Õ°‰´¥å (a) ¢—ÈπµÕπ°“√‡°‘¥ ·µππ— Õ—≈§Õ°‰´¥å ·≈– (b) ¢—ÈπµÕπ°“√‡ªî¥«ß·À«π¢Õß·≈§‰∑¥å (∑’Ë¡“: Dechy-Cabaret et al., 2004) ¡∫—µ‘∑“ß§«“¡√âÕπ¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥ ”À√—∫ PLLA ·≈– PDLA ‡ªìπæÕ≈‘‡¡Õ√å °÷Ëßº≈÷° (semi-crystalline polymers) ∑’Ë¡’§à“Õÿ≥À¿Ÿ¡‘ °“√À≈Õ¡ (melting temperatures, T m ) Õ¬Ÿà„πà«ß ª√–¡“≥ 170-180 Õß»“‡´≈‡´’¬ ·≈–¡’§à“Õÿ≥À¿Ÿ¡‘°“√ ‡ª≈’Ë¬π ∂“π–§≈â“¬·°â« (glass-transition temperature, T g ) Õ¬Ÿà„πà«ßª√–¡“≥ 60 - 65 Õß»“‡´≈‡´’¬ ¢≥–∑’Ë PDLLA ‡ªìπæÕ≈‘‡¡Õ√åÕ —≥∞“π (amorphous polymer) ‰¡à¡’§«“¡‡ªìπº≈÷° ®÷ß‰¡àª√“°Ø§à“ T m ‚¥¬ ¡’§à“ T g Õ¬Ÿà„πà«ßª√–¡“≥ 50-60 Õß»“‡´≈‡´’¬ (Maharana et al., 2009) ‚¥¬§à“ T g ·≈– T m ¢Õß æÕ≈‘·≈§µ‘°·Õ´‘¥®–¡’§à“¡“°¢÷Èπ ‡¡◊ËÕ§«“¡¬“«¢Õß ‚¡‡≈°ÿ≈ À√◊ÕπÈ”Àπ—°‚¡‡≈°ÿ≈¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥ ‡æ‘Ë¡¢÷Èπ ¡∫—µ‘°“√≈–≈“¬¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥ §«“¡ “¡“√∂„π°“√≈–≈“¬ (solubility) „π µ—«∑”≈–≈“¬Õ‘π∑√’¬å¢Õß PLLA ·≈– PDLLA · ¥ß „πµ“√“ß∑’Ë 1 ‚¥¬ PDLA ®–¡’§«“¡ “¡“√∂„π°“√ ≈–≈“¬‡àπ‡¥’¬«°—π°—∫ PLLA ®“°µ“√“ß∑’Ë 1 æ∫«à“ PDLLA “¡“√∂≈–≈“¬„πµ—«∑”≈–≈“¬Õ‘π∑√’¬å‰¥â À≈“¬π‘¥¡“°°«à“ PLLA ‡π◊ËÕß®“°§«“¡‡ªìπº≈÷°¢Õß PLLA ∑”„Àâ “¡“√∂≈–≈“¬„πµ—«∑”≈–≈“¬Õ‘π∑√’¬å µà“ßÊ‰¥âπâÕ¬°«à“ PDLLA
∫∑§«“¡ «“√ “√«‘∑¬“»“ µ√å ¡¢. ªï∑’Ë 39 ©∫—∫∑’Ë 1 63 µ“√“ß∑’Ë 1 §«“¡ “¡“√∂„π°“√≈–≈“¬¢ÕßæÕ≈‘·≈§µ‘°·Õ´‘¥„πµ—«∑”≈–≈“¬Õ‘π∑√’¬åµà“ßÊ (Södergård and Stolt, 2002) Organic solvents PLLA PDLLA Isopropyl ether Cyclohexane Xylene Ethyl acetate Tetrahydrofuran Chloroform Methyl ether ketone Furan Acetone 1,4-Dioxane Ethyl lactate 1,3-Dioxolane Pyridine Dimethylsulfoxide N,N-Dimethylformamide Ethanol = non-soluble, = swelling, = soluble
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