Two-Step Process for Continuous Polymerization of Polylactic Acid

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We examined a two-step process concept for PLA polymerization with a small amount of catalyst addition to achieve both a high conversion ratio and a small degree of yellowing. First, we developed a calculation program for the chemical reactions. Next, we carried out beaker-scale PLA polymerization experiments to measure the degrees of yellowing. The measured values were compared to amounts of thermal degradation estimated from the calculations simulating the experiments. Then, bench-scale equipment experiments were carried out on the basis of the obtained conditions. The conversion ratios and the degrees of yellowing of the PLA samples obtained from the bench-scale equipment were compared to the numerical simulation results to verify the process concept and conditions. 170°C was good for a first polymerization temperature to avoid a runaway reaction due to heat generation in the ring-opening polymerization. To minimize the degree of yellowing at conversion ratio of 0.9, we chose 5 h as both the first polymerization time at 170°C and the second polymerization time at 190°C. From bench-scale continuous polymerization experiments, we got PLA that had a conversion ratio of 0.92, a weight average molecular weight of 1.96 × 10<SUP>5</SUP>, and a <I>b</I>-value of 2.42 to verify the concept of the two-step process.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 41(6), 474-484, 2008-06-01 

    The Society of Chemical Engineers, Japan

参考文献:  18件

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被引用文献:  2件

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各種コード

  • NII論文ID(NAID)
    10021110463
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    9544429
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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