Alfano Sara, Doineau Estelle, Perdrier Coline, Preziosi-Belloy Laurence, Gontard Nathalie, Martinelli Andrea, Grousseau Estelle, Angellier-Coussy Hélène
Department of Chemistry, University of Rome La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy.
JRU IATE 1208, INRAE, Montpellier SupAgro, University of Montpellier, CEDEX 02, 34060 Montpellier, France.
ACS Omega. 2024 Jun 27;9(27):29360-29371. doi: 10.1021/acsomega.4c01282. eCollection 2024 Jul 9.
Poly(3-hydroxybutyrate--3-hydroxyvalerate (P(3HB--3HV) copolymers are an attractive class of biopolymers whose properties can be tailored by changing the 3-hydroxyvalerate monomer (3HV) concentration, offering the possibility of counteracting problems related to high crystallinity, brittleness, and processability. However, there are few studies about the effects of 3HV content on the processability of copolymers. The present study aims to provide new insights into the effect of 3HV content on the processing step including common practices like compounding, addition of nucleation agents and/or amorphous polymers as plasticizers. P(3HB--3HV)-based films containing 3, 18, and 28 mol % 3HV were processed into films by extrusion and subsequent molding. The characterization results confirmed that increasing the 3HV content from 3 to 28 mol % resulted in a decrease in the melting point (from 175 to 100 °C) and an improvement in mechanical properties (i.e., elongation at break from 7 ± 1% to 120 ± 3%). The behavior of P(3HB--3HV) in the presence of additives was also investigated. It was shown that an increase in the 3HV content leads to better miscibility with amorphous polymers.
聚（3-羟基丁酸酯-3-羟基戊酸酯）（P(3HB-3HV)）共聚物是一类有吸引力的生物聚合物，其性能可通过改变3-羟基戊酸酯单体（3HV）的浓度来调整，从而有可能解决与高结晶度、脆性和加工性能相关的问题。然而，关于3HV含量对共聚物加工性能影响的研究很少。本研究旨在深入了解3HV含量对包括混合、添加成核剂和/或无定形聚合物作为增塑剂等常见加工步骤的影响。含3、18和28摩尔% 3HV的P(3HB-3HV)基薄膜通过挤出和后续成型加工成薄膜。表征结果证实，将3HV含量从3摩尔%提高到28摩尔%会导致熔点降低（从175℃降至100℃）并改善机械性能（即断裂伸长率从7±1%提高到120±3%）。还研究了P(3HB-3HV)在添加剂存在下的行为。结果表明，3HV含量的增加会导致与无定形聚合物更好地混溶。
