摘要
为了提高聚乳酸的亲水性,以辛酸亚锡为催化剂、聚乙二醇单甲醚(mPEG)为大分子引发剂进行丙交酯(LLA)开环聚合,合成聚乙二醇-b-聚乳酸两嵌段共聚物(PELA).以红外光谱1、H核磁共振谱、接触角测试、差热扫描量热分析等方法对PELA的结构及性能进行表征.结果表明,通过调控mPEG与LLA的投料比可以控制PELA的相对分子质量,而随着mPEG组分含量或链长增加,共聚物亲水性增强,但其Tg、Tcc、Tm有所降低.由普通电纺制备PELA超细纤维,并分别由乳液电纺和同轴电纺得到以水溶性聚氧化乙烯(PEO)为芯、PELA为壳的芯/壳结构复合超细纤维(E-PEO/PELA和C-PEO/PELA).扫描电镜和透射电镜结果表明,PELA、E-PEO/PELA和C-PEO/PELA超细纤维形貌良好.随着PELA中mPEG含量的增加,电纺PELA纤维膜的吸水率增强,而由乳液电纺和同轴电纺制备的PEO/PELA芯/壳结构超细纤维膜,亲水性均好于PELA超细纤维膜.
In order to improve the hydrophilicity of poly（lactic acid） ,poly（ethylene glycol）-b-poly（L-lactic acid） diblock copolymers （PELA） with different relative molecular masses and compositions were synthesized by ringopening polymerization of L-lactide （LLA） with Sn （Oct）2 as the catalyst and methoxy poly （ethylene glycol） （mPEG） as the initiator. The structure and properties were investigated by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, contact angle measurements and differential scanning calorimetry. Results indicated that the relative molecular mass of PELA could be controlled by adjusting the feed ratio of mPEG to LLA, and the hydrophilicity of PELA increased with the increase of amount and chain length of mPEG, but the values of Tg, Tcc, Tm of PELA decreased. Uhrafine fibrous PELA membranes were prepared by traditional electrospinning from a 0.2 g/mL PELA solution in a mixture of chloroform and N, N-dimethylformamide （90： 10, V/V）, and fibrous composite membranes with water-soluble poly （ethylene oxide） （PEO） as the core polymer were produced by emulsion electrospinning from a W/O emulsion solution of PEO/PELA in water/chloroform （E-PEO/PELA） and coaxial electrospinning from an aqueous PEO solution as the inner polymer solution and a PELA solution in 2,2,2- trifluoroethyl alcohol as the outer polymer solution （C-PEO/PELA）, respectively. Characterization by scanning electron microscope and transmission electron microscope verified the fine fiber morphology of the above three kinds of the obtained electrospun fibers. The hydrophilicity of the electrospun PELA membranes increased with their content of mPEG. Core/shell E-PEO/PELA and C-PEO/PELA fiber structures were obtained by both emulsion electrospinning and coaxial electrospinning, meanwhile their hydrophilicity was better than that of the electrospun PELA membrane because of the special core/shell fiber structure and PEO in the core.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2008年第5期405-409,共5页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号50573055)资助项目
关键词
聚乙二醇-聚乳酸共聚物
亲水性
电纺
超细纤维
Poly （ ethylene glycol ）- b-poly （ L-lactic acid ） copolymer, Hydrophilicity, Electrospinning, Ultrafinefiber
