陕西师范大学学报（自然科学版）
陝西師範大學學報（自然科學版）
협서사범대학학보（자연과학판）
JOURNAL OF SHAANXI NORMAL UNIVERSITY(NATURAL SCIENCE EDITION)
2010年
2期
50-53
,共4页
引发剂%季戊四醇%星形L-聚乳酸%微波辐射%合成
引髮劑%季戊四醇%星形L-聚乳痠%微波輻射%閤成
인발제%계무사순%성형L-취유산%미파복사%합성
initiator%pentaerythritol%star-shape poly(latic acid)%microwave radiation%synthesis
通过微波辐射,以L-乳酸为原料、SnCl_2为催化剂、季戊四醇为引发剂,在负压和氮气保护条件下合成了具有直链和星形结构的L-聚乳酸.产物黏均分子量和玻璃化温度均较高.发现了氮气流量的大小对合成产物颜色的影响较大,当氮气流量较大时产物白度大,氮气流量小时产物白度小,优化了合成条件.并用FTIR、~(13)C NMR对产物进行了结构表征.利用GPC、DSC和MDA对产物进行了分析,分析结果显示星形结构的L-聚乳酸具有应变小、受力后外形恢复快等特点,比直链结构的L-聚乳酸更适合作医学骨质替代物.
通過微波輻射,以L-乳痠為原料、SnCl_2為催化劑、季戊四醇為引髮劑,在負壓和氮氣保護條件下閤成瞭具有直鏈和星形結構的L-聚乳痠.產物黏均分子量和玻璃化溫度均較高.髮現瞭氮氣流量的大小對閤成產物顏色的影響較大,噹氮氣流量較大時產物白度大,氮氣流量小時產物白度小,優化瞭閤成條件.併用FTIR、~(13)C NMR對產物進行瞭結構錶徵.利用GPC、DSC和MDA對產物進行瞭分析,分析結果顯示星形結構的L-聚乳痠具有應變小、受力後外形恢複快等特點,比直鏈結構的L-聚乳痠更適閤作醫學骨質替代物.
통과미파복사,이L-유산위원료、SnCl_2위최화제、계무사순위인발제,재부압화담기보호조건하합성료구유직련화성형결구적L-취유산.산물점균분자량화파리화온도균교고.발현료담기류량적대소대합성산물안색적영향교대,당담기류량교대시산물백도대,담기류량소시산물백도소,우화료합성조건.병용FTIR、~(13)C NMR대산물진행료결구표정.이용GPC、DSC화MDA대산물진행료분석,분석결과현시성형결구적L-취유산구유응변소、수력후외형회복쾌등특점,비직련결구적L-취유산경괄합작의학골질체대물.
The PLAs with linear-chain(PLLA) and star-shape (SPLLA) structure were directly synthesized using L-latic acid as row material, SnCl_2 as catalyst, pentaerythritol as initiator under inert nitrogen atmosphere with microwave radiation. The synthesized product has high viscosity-average molecular weight and glass transition temperature. The results also showed that the color of the product lighten with increasing the flow rate of the inert gas. The synthetic conditions were finally optimized. Polymers were structurally characterized by FT-IR and ~(13)C NMR techniques and also analyzed by GPC and DSC. MDA results showed that SPLLA has a smaller strain, faster recovery of shape, and SPLLA is more suitable than PLLA in medical used as bone substeitute.
