Synthesis of polylactic acid by direct polycondensation under vacuum without catalysts, solvents and initiators

被引：0
|
作者：
Achmad, Feerzet [1 ]
Yamane, Kenji [1 ]
Quan, Shi [1 ]
Kokugan, Takao [1 ]
机构：
[1] Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo, 184-8588, Japan
来源：
Chemical Engineering Journal | 2009年 / 151卷 / 1-3期
关键词：
In order to reduce the production cost of polylactic acid (PLA); l-lactic acid was polymerized by direct polycondensation (DP) under vacuum without catalysts; solvents and initiators. Experiments were conducted at polymerization temperatures (Tp) of 150-250 °C. The maximum PLA molecular weight obtained was 90 kDa at 200 °C after 89 h under vacuum. Above 200 °C; PLA is thermally degraded by specific scission. The DP activation energy (Ea) was also investigated and was found to be larger than that required by catalyzed ring opening polymerization (ROP). Furthermore; the Ea was higher than the deactivation energy (Ed) for both DP and ROP. PLA yields were higher at lower Tp; while the yield of lactide increased with Tp. The total yield of PLA and lactide was approximately 52-75 wt.%. The uncatalyzed DP method may have applications in on-site cell plant production; where compactness is required; as well as safe and simple operating procedures. © 2009 Elsevier B.V. All rights reserved;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
页码：342 / 350
相关论文
共 50 条
  • [21] A NEW METHOD FOR THE PREPARATION OF DRUG CONTAINING POLYLACTIC ACID MICROPARTICLES WITHOUT USING ORGANIC-SOLVENTS
    WICHERT, B
    ROHDEWALD, P
    JOURNAL OF CONTROLLED RELEASE, 1990, 14 (03) : 269 - 283
  • [22] SYNTHESIS OF AROMATIC POLYKETONES BY DIRECT POLYCONDENSATION BETWEEN TEREPHTHALIC ACID AND DIARYL COMPOUNDS
    JIN, JI
    LEE, SY
    PARK, JH
    POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING, 1994, 33 (03) : 253 - 263
  • [23] In situ synthesis of poly(ether ester) via direct polycondensation of terephthalic acid and 1,3-propanediol with sulfonic acids as catalysts
    Gan, Ziyao
    Bing, Dexian
    Qu, Shuang
    Li, Shengyi
    Tan, Tianwei
    Yang, Jing
    POLYMER CHEMISTRY, 2019, 10 (26) : 3629 - 3638
  • [24] Ionic liquids as solvents for dissolution of corn starch and homogeneous synthesis of fatty-acid starch esters without catalysts
    Gao, Jing
    Luo, Zhi-Gang
    Luo, Fa-Xing
    CARBOHYDRATE POLYMERS, 2012, 89 (04) : 1215 - 1221
  • [25] Synthesis and characterization of poly(lactic acid-co-mandelic acid)s by direct solution polycondensation
    Kim, WJ
    Kim, JH
    Kim, SH
    Kim, YH
    POLYMER-KOREA, 2000, 24 (03) : 431 - 436
  • [26] Environmentally benign polyester synthesis by room temperature direct polycondensation of dicarboxylic acid and diol
    Takasu, A
    Iio, Y
    Oishi, Y
    Narukawa, Y
    Hirabayashi, T
    MACROMOLECULES, 2005, 38 (04) : 1048 - 1050
  • [27] Synthesis of high molecular weight poly(α,β-malic acid) for biomedical use by direct polycondensation
    Kajiyama, T
    Taguchi, T
    Kobayashi, H
    Kataoka, K
    Tanaka, J
    POLYMER DEGRADATION AND STABILITY, 2003, 81 (03) : 525 - 530
  • [28] Synthesis of PLLA(I): Direct melt polycondensation of L-lactic acid.
    Mai, HZ
    Zhao, YM
    Wang, ZY
    Yan, B
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2002, 223 : D2 - D2
  • [29] Cobalt Catalysts for Alkene Hydrosilylation under Aerobic Conditions without Dry Solvents or Additives
    Gutierrez-Tarrino, Silvia
    Concepcion, Patricia
    Ona-Burgos, Pascual
    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 2018, (45) : 4867 - 4874
  • [30] Studies on the synthesis and thermal properties of copoly(L-lactic acid/glycolic acid) by direct melt polycondensation
    Lan, P
    Zhang, YP
    Gao, QW
    Shao, HL
    Hu, XC
    JOURNAL OF APPLIED POLYMER SCIENCE, 2004, 92 (04) : 2163 - 2168
12345