随着全球生物经济的发展,生物基材料由于其绿色低碳、环境友好和资源节约等特点成为了新的研究焦点。本文以同一生物基来源的2,5-呋喃二甲酸和1,5-戊二醇为基础,通过熔融聚合制备了一系列无规的韧性聚酯材料——聚呋喃二甲酸戊二醇酯(PP...随着全球生物经济的发展,生物基材料由于其绿色低碳、环境友好和资源节约等特点成为了新的研究焦点。本文以同一生物基来源的2,5-呋喃二甲酸和1,5-戊二醇为基础,通过熔融聚合制备了一系列无规的韧性聚酯材料——聚呋喃二甲酸戊二醇酯(PPeF)。利用1 H NMR和FTIR确定其分子结构后,通过溶剂铺膜的方式得到薄膜材料。GPC的结果表明,PPeF的数均分子量均在2万以上,且多分散性指数为2.0~2.4,分子量分布较窄。TG的结果表明,PPeF的初始热分解温度约为370℃,具有良好的耐热性及加工性。XRD的结果表明,PPeF处于非结晶状态。力学测试结果表明,PPeF薄膜具备较好的延展性,其最大的断裂伸长率可达1764%。PPeF作为一种可生物降解的材料,可将其应用于脆性生物基材料的改性。展开更多
The behavior of poly(ethylene glycol)-b-poly(butylene terephthalate) copol ymer has been investigated. The influences of the immersing time(in phosphate buffer solution of pH=7 4, at (37±1) ℃) on the sw elling r...The behavior of poly(ethylene glycol)-b-poly(butylene terephthalate) copol ymer has been investigated. The influences of the immersing time(in phosphate buffer solution of pH=7 4, at (37±1) ℃) on the sw elling ratio, the mass loss and the surface morphology of the copolymer film were examined. The copolymer is found to be degradable. The m icrospheres of PEG-b-PBT were prepared by a solvent extraction method using PVA as a stabilizer and characteristic of a sm ooth and spherical surface, sized about 1 133 μm. IR and XRD results reveal that Levonorgestrel crystalls are physically entrapped in the microspheres of the copolymer.展开更多
文摘随着全球生物经济的发展,生物基材料由于其绿色低碳、环境友好和资源节约等特点成为了新的研究焦点。本文以同一生物基来源的2,5-呋喃二甲酸和1,5-戊二醇为基础,通过熔融聚合制备了一系列无规的韧性聚酯材料——聚呋喃二甲酸戊二醇酯(PPeF)。利用1 H NMR和FTIR确定其分子结构后,通过溶剂铺膜的方式得到薄膜材料。GPC的结果表明,PPeF的数均分子量均在2万以上,且多分散性指数为2.0~2.4,分子量分布较窄。TG的结果表明,PPeF的初始热分解温度约为370℃,具有良好的耐热性及加工性。XRD的结果表明,PPeF处于非结晶状态。力学测试结果表明,PPeF薄膜具备较好的延展性,其最大的断裂伸长率可达1764%。PPeF作为一种可生物降解的材料,可将其应用于脆性生物基材料的改性。
文摘The behavior of poly(ethylene glycol)-b-poly(butylene terephthalate) copol ymer has been investigated. The influences of the immersing time(in phosphate buffer solution of pH=7 4, at (37±1) ℃) on the sw elling ratio, the mass loss and the surface morphology of the copolymer film were examined. The copolymer is found to be degradable. The m icrospheres of PEG-b-PBT were prepared by a solvent extraction method using PVA as a stabilizer and characteristic of a sm ooth and spherical surface, sized about 1 133 μm. IR and XRD results reveal that Levonorgestrel crystalls are physically entrapped in the microspheres of the copolymer.
