欢迎登录材料期刊网

材料期刊网

高级检索

以乳酸为原料,辛酸亚锡为催化剂,采用梯度升温法,在168℃、0.098MPa下直接熔融缩聚生成端羧基聚乳酸共聚物P(LA/SA)、P(LA/CA)和P(LA/AC).用乌氏粘度法、FT-IR、1H-NMR、DSC、TGA及XRD等对共聚物进行了表征.结果表明和PLA相比,3种端羧基共聚物Tg均有不同程度的降低,说明端羧基的引入降低了聚乳酸的刚性;TGA结果表明各共聚物热稳定性提高为一步热分解过程;XRD分析得出P(LA/SA)和P(LA/AC)比PLA的结晶度有所升高,而P (LA/CA)的结晶度略微降低,说明可通过调节乳酸和改性剂的配比来调节材料的力学性能.

参考文献

[1] Hidto Tsuji;Ippei Fukui .Enhanced thermal stability of poly(lactide)s in the melt by enantiomeric polymer blending[J].Polymer: The International Journal for the Science and Technology of Polymers,2003(10):2891-2896.
[2] Pluta M .Morphology and properties of polylactide modified by thermal treatment, filling with layered silicates and plasticization[J].Polymer: The International Journal for the Science and Technology of Polymers,2004(24):8239-8251.
[3] Ragauskas A;Williams C;Davision B et al.[J].Science,2006,311:484-489.
[4] Woo S I;Kim B O;Jun H S et al.[J].Polymer Bulletin,1995,35(04):415-421.
[5] Inata H;Matsumura S .[J].Journal of Applied Polymer Science,1986,32:4581-4585.
[6] Harkonen M;Hiltunen K;Malin M et al.[J].Journal of Macromolecular Science Part A:Pure and Applied Chemistry,1995,32(04):857-862.
[7] 张建安,吴明元,吴庆云,杨建军,程杰.生物降解材料聚乳酸的合成与表征[J].安徽大学学报(自然科学版),2008(06):78-81.
[8] J.Kylma;J.Tuominen;A Helminen;J.Seppala .Chain extending of lactic acid oligomers.Effect of 2,2'-bis(2-oxazoline) on 1,6hexamethylene diisocyanate linking reaction[J].Polymer: The International Journal for the Science and Technology of Polymers,2001(8):3333-3343.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%