Effect of the Molecular Structure of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-3HV)) Produced from Mixed Bacterial Cultures on Its Crystallization and Mechanical Properties,Biomacromolecules

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Effect of the Molecular Structure of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-3HV)) Produced from Mixed Bacterial Cultures on Its Crystallization and Mechanical Properties
Biomacromolecules ( IF 5.5 ) Pub Date : 2020-10-29 , DOI: 10.1021/acs.biomac.0c00826
Julie Bossu ₁ , Hélène Angellier-Coussy ₁ , Cedric Totee ₂ , Mariana Matos ₃ , Maria Reis ₃ , Valérie Guillard ₁

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Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(3HB-3HV)) copolymer’s properties depend on (i) the molar fraction of comonomers, (ii) the overall molar mass, and (ii) the chemical compositional distribution. This work aims at providing a better understanding of the effect of the P(3HB-3HV) molecular structure, produced from mixed cultures and waste feedstock, on copolymer crystallization and tensile properties. Conventional biopolymer characterization methods (differential scanning calorimetry, X-ray diffraction, and polarized optical microscopy) were coupled to both classical one-dimensional (¹H and ¹³C) and advanced two-dimensional (diffusion-ordered spectroscopy (DOSY) and ¹H/¹³C heteronuclear single quantum coherence (HSQC)) nuclear magnetic resonance (NMR) spectroscopy techniques. The obtained results evidenced that (i) a high-quality copolymer could be achieved, even from a waste feedstock; (ii) increasing the 3HV content displayed a positive impact on P(3HB-3HV) mechanical properties only if good interactions between 3HB and 3HV moieties were established; and (iii) the purification process eliminated short-length 3HV-rich chains and promoted homogeneous co-crystallization. Such optimized microstructures enabled the maximal stress and strain at break to be increased by +41.2 and +100%, respectively.

中文翻译：

聚（3-羟基丁酸酯的分子结构的影响共同从及其晶化和力学性能的混合细菌培养-3-羟基戊酸酯）（P（3HB-3HV））生产的

聚（3-羟基丁酸酯-共-3-羟基戊酸酯）（P（3HB-3HV））共聚物的性能取决于（i）共聚单体的摩尔分数，（ii）总摩尔质量和（ii）化学组成分布。这项工作旨在更好地理解由混合培养物和废料产生的P（3HB-3HV）分子结构对共聚物结晶和拉伸性能的影响。常规的生物聚合物表征方法（差示扫描量热法，X射线衍射和偏振光学显微镜）已与经典一维（¹ H和¹³ C）和高级二维（扩散有序光谱法（DOSY）和¹ H ）耦合/ ¹³C异核单量子相干（HSQC））核磁共振（NMR）光谱技术。获得的结果证明：（i）即使从废料中也可以得到高质量的共聚物；（ii）仅在3HB和3HV部分之间建立起良好的相互作用时，增加3HV含量才对P（3HB-3HV）力学性能产生积极影响；（iii）纯化过程消除了短的富含3HV的链并促进了均匀的共结晶。这种优化的微结构使断裂时的最大应力和应变分别增加了+41.2和+ 100％。

更新日期：2020-12-14

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