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《酯交換反應(yīng)條件對聚(L-丙交酯-co-ε-己內(nèi)酯)力學(xué)性能的影響.pdf》由會員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫。
1、2011年第19卷第5期,590-594·研究論文·合成化學(xué)Chin船eJournalof‘SyntheticChemistryV01.19,20IINo.5,590—594酯交換反應(yīng)條件對聚(L.丙交酯.CO—s.己內(nèi)酯)力學(xué)性能的影響吳航1,一,張麗芳1,熊左春1,(1.中國科學(xué)院成都有機(jī)化學(xué)研究所,四川成都馬馳1.一,陳棟梁1,熊成東1610041;2.中國科學(xué)院研究生院,北京10039)摘要:以辛酸亞錫催化L丙交酯(kLA)和g.己內(nèi)酯(8.CL)通過酯交換反應(yīng)完成本體開環(huán)聚合制得可降解的生物醫(yī)用
2、材料聚(L丙交酯-CO-占-己內(nèi)酯)(PLLCA),其結(jié)構(gòu)和熱性能經(jīng)1HNMR,高效凝膠色譜和差示掃描量熱分析表征。研究了酯交換反應(yīng)條件對PLLCA力學(xué)性能的影響,結(jié)果表明,提高聚合溫度有利于酯交換反應(yīng)進(jìn)行,LLA和占一CL的平均嵌段長度減小,PLLCA的玻璃化轉(zhuǎn)變溫度(Tg)和拉伸強(qiáng)度也隨之減小,斷裂伸長率則單調(diào)增大;增大8-CL的投料摩爾分?jǐn)?shù)同樣有利于酯交換反應(yīng)的進(jìn)行,LLA的平均嵌段長度隨之減小而s.cL的平均嵌段長度則增大,Tg和拉伸強(qiáng)度均隨之減小。關(guān)鍵詞:L-丙交酯;8-己內(nèi)酯;酯交換反應(yīng);聚(
3、o丙交酯-CO-占-己內(nèi)酯);拉伸強(qiáng)度;斷裂伸長率.中圖分類號:0631.1文獻(xiàn)標(biāo)識碼:A文章編號:1005-1511(2011)05-0590-05InfluenceofTransesterificationConditionsonMechanicalPerformanceofPoly(L-lactide-CO-E—caprolactone)WUHan91”,ZHANGLi.fan91,XIONGZuo—chunl,MAChil,-,CHENDong-lian91,XIONGCheng.don91(1.
4、ChengduInstituteof0瑁aIIicChemistry,Chin∞eAcademyofSciences,Chengdu610041,China;2.GraduatedSchoolofChineseAcademyofSciences,Bcijing100039,China)Abstract:Abiodegradablebiomedicalmaterial,poly(L-lactide—CO·占-caprolactone)(PLLCA)waspreparedbytransesterificati
5、onofL—lactide(L—LA)and占-caprolactone(占-CL)inbulkopenloopU—singstannousoctoateasthecatalyst.ThestructureandthermalpropertiesofPLLCAwerecharacter-izedby1HNMR。gelchromatographyanddifferentialscanningcalorimetry.Influenceoftransesterifi-cationconditionsOilmec
6、hanicalperformanceofPU£Awereinvertigated.TheresultsshowedthattransesterificationwasboostedbyincreaseofpolymerizationtemperatureandaveragelengthofL廣LAand占一CLblocksdecreasedovertherangeof130oCto150℃.Glasstransitiontemperature(Tg)andtensilestrengthofPLLCAals
7、odecreasedwithincreaseofthetemperature,however,theelongationofPLLCAincreased.Increaseof占.CLmolefractionwasalsobeneficialtotransesterification.a(chǎn)veragelengthofL—LAblockdecreasedovertherangeof0.1to0.9andaveragelengthof占一CLblockin—creasedonthecontrary.TheTgan
8、dtensilestrengthofPLLCAalsodecreasedwithincreaseofF—CLmolefraction.Keywords:L-lactide;8-caprolaetone;transesterification;poly(L—lactide-C0-8一caprolactone);ten.silestrength;elongation收稿日期:2011-05-26;修訂日期:2011-06-20基金