乙交酯、L-丙交酯均聚物及其共聚物的制備和性能研究
發(fā)布時間:2018-10-10 11:43
【摘要】:以辛酸亞錫為催化劑、1,4-丁二醇為引發(fā)劑,在高溫、高真空條件下本體熔融開環(huán)聚合制備了聚乙交酯(PGA)、聚L-丙交酯(PLLA)及其不同比例的共聚物(PLGA).通過紅外光譜(IR)、核磁共振(1H-NMR)對聚合物的結構進行了表征,用烏氏黏度計、凝膠滲透色譜儀(GPC)、示差掃描量熱儀(DSC)、熱重分析儀(TGA)、X射線粉末衍射儀(XRD)、流變儀等對聚合物的特性黏數、分子量與分子量分布、熱性能、結晶性、流變性能進行了研究.結果表明PLGA和PLLA具有較高的分子量和窄的分子量分布;PGA、PLLA、PLGA均具有較高的熱穩(wěn)定性,隨著PLGA中PGA單元的增加,分解溫度逐漸升高.直接熔融合成的PGA在各有機溶劑中溶解性都不理想,用二甲基亞砜(DMSO)重結晶后的PGA在六氟異丙醇(HFIP)中的溶解度增大;PGA、PLLA具有較高的結晶度,而PLGA以非晶態(tài)存在,DMSO重結晶后的PGA的結晶度降低.PGA、PLLA、PLGA的熔體均是剪切變稀流體,但PGA、PLLA具有較高的儲能模量,PLGA具有較高的損耗模量.相對于PGA和PLLA,無規(guī)共聚的PLGA易純化,并且柔性較好,更易加工,因此PLGA是更適宜的生物可降解材料.
[Abstract]:Poly (glycolide) (PGA), poly (L- lactide) (PLLA) and its copolymers (PLGA). Were prepared by bulk melt ring-opening polymerization at high temperature and high vacuum using stannous octanoate as catalyst. The structure of the polymer was characterized by infrared (IR), NMR (1H-NMR). The intrinsic viscosity of the polymer was characterized by Wursonian viscometer, (GPC), differential scanning calorimeter, (TGA) X-ray powder diffractometer, (XRD), rheometer, etc. Molecular weight and molecular weight distribution, thermal properties, crystallization, rheological properties were studied. The results show that both PLGA and PLLA have high molecular weight and narrow molecular weight distribution. The decomposition temperature increases with the increase of PGA units in PLGA. The solubility of PGA synthesized by direct melt synthesis is not ideal in all organic solvents. The solubility of PGA after recrystallization with dimethyl sulfoxide (DMSO) in hexafluoroisopropanol (HFIP) is increased, and that of PGA,PLLA has higher crystallinity. However, the crystallinity of DMSO recrystallized PGA decreases with the existence of PLGA in amorphous state. The melt of PGA,PLLA,PLGA is shear-thinning fluid, but PGA,PLLA has higher storage modulus and PLGA has higher loss modulus. Compared with the random copolymerization of PGA and PLLA, PLGA is easy to purify, flexible and easy to process, so PLGA is a more suitable biodegradable material.
【作者單位】: 山東師范大學化學化工與材料科學學院教育部化學成像功能探針協(xié)同創(chuàng)新中心 齊魯工業(yè)大學山東省輕工助劑重點實驗室
【基金】:山東省自然科學基金(基金號ZR2013EMM004) 國家級大學生創(chuàng)新計劃項目(項目號201101020236)資助
【分類號】:R318.08
[Abstract]:Poly (glycolide) (PGA), poly (L- lactide) (PLLA) and its copolymers (PLGA). Were prepared by bulk melt ring-opening polymerization at high temperature and high vacuum using stannous octanoate as catalyst. The structure of the polymer was characterized by infrared (IR), NMR (1H-NMR). The intrinsic viscosity of the polymer was characterized by Wursonian viscometer, (GPC), differential scanning calorimeter, (TGA) X-ray powder diffractometer, (XRD), rheometer, etc. Molecular weight and molecular weight distribution, thermal properties, crystallization, rheological properties were studied. The results show that both PLGA and PLLA have high molecular weight and narrow molecular weight distribution. The decomposition temperature increases with the increase of PGA units in PLGA. The solubility of PGA synthesized by direct melt synthesis is not ideal in all organic solvents. The solubility of PGA after recrystallization with dimethyl sulfoxide (DMSO) in hexafluoroisopropanol (HFIP) is increased, and that of PGA,PLLA has higher crystallinity. However, the crystallinity of DMSO recrystallized PGA decreases with the existence of PLGA in amorphous state. The melt of PGA,PLLA,PLGA is shear-thinning fluid, but PGA,PLLA has higher storage modulus and PLGA has higher loss modulus. Compared with the random copolymerization of PGA and PLLA, PLGA is easy to purify, flexible and easy to process, so PLGA is a more suitable biodegradable material.
【作者單位】: 山東師范大學化學化工與材料科學學院教育部化學成像功能探針協(xié)同創(chuàng)新中心 齊魯工業(yè)大學山東省輕工助劑重點實驗室
【基金】:山東省自然科學基金(基金號ZR2013EMM004) 國家級大學生創(chuàng)新計劃項目(項目號201101020236)資助
【分類號】:R318.08
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