Crystallization and Melting Behavior in Blends of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)s with a Narrow Composition Distribution
Crystallization and Melting Behavior in Blends of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)s with a Narrow Composition Distribution
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具有窄组成分布的聚(3-羟基丁酸酯-co-3-羟基戊酸酯)共混物的结晶和熔融行为
DOI：
10.1295/polymj.28.45
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发表时间：
1996
期刊：
影响因子：
2.8
通讯作者：
Y. Inoue
中科院分区：
文献类型：
--
作者：
N. Yoshie;Hiroyuki Menju;Hidenori Sato;Y. Inoue
研究了细菌合成的P（HB-co-HV）组分分布较窄的聚（3-羟基丁酸酯-co-3-羟基戊酸酯）（P(HB-co-HV)）共聚酯的结晶和熔融行为，并与分馏前的P（HB-co-HV）进行了比较。DSC熔化热图和球晶生长速率的分析表明，混合可能产生四种情况。它们是：(i)由混相熔体形成的同构晶相。（ii）在(i)和（iii）两种情况下观察到的由混溶熔体形成的两种结晶相。（iii）从混溶熔体中分离出具有最大结晶速率的组分聚酯的结晶相。（iv）由不混溶熔体形成的与纯组分相似的两种结晶相。大多数细菌P（HB-co-HV）共聚酯处于(i)状态，与P（HB-co-HV）难以区分，组成分布狭窄。某些细菌P（HB-co-HV）共聚酯组分分布极广，其行为与P（HB-co-HV）组分分布窄不同。我们需要考虑这些P（HB-co-HV）样品成分分布的细节。特别是在情形（iii）中，我们容易把分节晶体的性质误认为是同构晶体的性质。对单个Tm的观察不足以证实晶体的同构。
Crystallization and melting behavior of blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(HB-co-HV)) copolyesters, which were prepared by compositional fractionation of bacterially synthesized P(HB-co-HV) and have a narrow composition distribution, have been investigated and compared to those of P(HB-co-HV) before fractionation. Analysis of DSC melting thermograms and spherulite growth rate indicates four situations that might arise from the blend. These are: (i) An isomorphous crystalline phase being formed from the miscible melt. (ii) Two crystalline phases observed in situations (i) and (iii) being formed from the miscible melt. (iii) A crystalline phase of the component polyester having the largest crystallization rate being partitioned from the miscible melt. (iv) Two crystalline phase similar to the pure components being formed from the immiscible melt. Most bacterial P(HB-co-HV) copolyesters are in situation (i) and are indistinguishable from P(HB-co-HV) having a narrow composition distribution. Some bacterial P(HB-co-HV) copolyesters, which have a extremely broad composition distribution, show behavior different from P(HB-co-HV) with a narrow one. We need to take account of the details of composition distribution of these P(HB-co-HV) samples. Especially in situation (iii), we are apt to mistake the properties of the partitioned crystals for those of the isomorphous crystals. An observation of a single Tm is not sufficient to confirm the isomorphous crystals.
影响因子：
5.5
作者：
KUNIOKA, M;DOI, Y
通讯作者：
DOI, Y