|
OALib Journal期刊
ISSN: 2333-9721
费用：99美元
|
|
|
|
氯化亚锡/萘二磺酸对d,l乳酸聚合物微结构的影响
DOI: 10.3969/j.jssn.1000-2006.2009.03.026, PP. 111-115
Keywords: d,l乳酸,聚乳酸,光学活性,立构选择性,微结构
Abstract:
以d,l乳酸为原料，氯化亚锡(sncl2)与萘二磺酸(nda)为催化剂体系，熔融缩聚制备聚乳酸，并采用旋光度法、1hnmr和13cnmr核磁共振法、x射线衍射和黏度法等研究萘二磺酸对聚乳酸微结构的影响。sncl2和nda分别催化d,l乳酸聚合可制备消旋的非晶态聚乳酸，而sncl2/nda催化体系所得的聚乳酸是高光学活性的l构型的结晶聚合物。sncl2/nda催化体系具有高度的立构选择性，且sncl2与nda配比及其用量对聚乳酸的光学活性、分子链的构型、链段序列分布和晶体结构等微结构均有明显的影响。当sncl2质量分数为0.5%、n(sncl2)/n(nda)为1∶1时，d,l乳酸熔融缩聚可制备光学纯度97.4%的高光学活性的l型聚乳酸。
| [1] | 高勤卫,李明子,董晓.d,l？乳酸的立构选择性聚合[j].南京林业大学学报:自然科学版,2008,32(3):43-47.
|
| [2] | 董晓.聚乳酸的立构选择性聚合研究[d].南京:南京林业大学,2007.
|
| [3] | robertjl,aubrechtkb.greenchemistry:ring？openingpolymerizationoflactidetoformabiodegradablepolymer[j].jchemedu,2008,85(2):258-260.
|
| [4] | platelrh,hodgsonlm,williamsck.biocompatibleinitiatorsforlactidepolymerization[j].polymrev,2008,48(1):11-63.
|
| [5] | tangzh,yangyk,pangx,etal.controlledandstereospecificpolymerizationofrac？lactidewithasingle？siteethylaluminumandalcoholinitiatingsystem[j].japplpolymsci,2005,98(1):102-108.
|
| [6] | 高勤卫,李明子,董晓.聚乳酸的立构选择性聚合的研究进展[j].现代化工,2007,27(10):20-24.
|
| [7] | gaoq？w,lanp,shaoh,etal.directsynthesiswithmeltpolycondensationandmicrostructureanalysisofpoly(l？lacticacid？co？glycolicacid)[j].polymj,2002,35(11):786-790.
|
| [8] | spasskyn,wisniewskim,plutac,etal.highlystereoelectivepolymerizationofrac？(d,l)？lactidewithachiralschiff’sbase/aluminiumalkoxideinitiator[j].macromolchemphys,1996,197:2627-2637.
|
| [9] | akihiroando,kuniokimura,yukoonda,etal.newattemptatthestereoselectivepoly？merizationoflactidebyusingcrystallizationduringpolymerizaion[j].macromolecularrapidcommunications,2005,26:98-102.
|
| [10] | choiej,parkjk,changhn.effectofpolymerizationcatalystsonthemicrostructureofpoly(l？la？co？εcl)[j].jpolymscipartb:polymphys,1994,32:2481-2489.
|
| [11] | esoarterojl,manolovasm,manolovan,etal.nmranalysisoflowmolecularweightpoly(lacticacid)s[j].macromoleculars,1996,29:3535-3539.
|
| [12] | svhindlera,harperdj.poly(lacticacid)istereosequencedistributioninthepolymerizationofracemicdilactide[j].polymsci:polymlett,1976,14:729-734.
|
| [13] | chamberlainbm,chengm,mooredr,etal.polymerizationoflactidewithzincandmagnesiumbeta？diiminatecomplexes:stereocontrolandmechanism[j].jamchemsoc,2001,123(14):3229-3238.
|
| [14] | coatesgeoffreyw,ovitttinam.stereoselectivering？openingpolymerizationoflactide:synthesisofsyndiotacticandheterotacticpoly(lacticacid)s[c]//bookofabstracts,219thacsnationalmeeting,sanfrancisco,ca,2000.
|
| [15] | kricheldorfhr,andsumbelm.polylactones？18polymerizationofl,l？lactidewithsn(ⅱ)andsn(ⅳ)halogenides[j].eurpolym,1989,25:585-591.
|
Full-Text
|
|
Contact Us
service@oalib.com QQ:3279437679 
WhatsApp +8615387084133
|
|
