Influence of amorphous alkaline lignin on the crystallization behavior and thermal properties of bacterial polyester

Abstract

Bacterial polyester poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and alkaline lignin composites were prepared via melt processing method, and the influence of amorphous lignin on the crystallization behavior and thermal properties of PHBV were investigated. It was found that dual melting peaks appeared in DSC curves of PHBV/lignin composites, while only one single peak existed in PHBV. The non-isothermal crystallization process analyzed by Jeziorny method suggested that lignin changed the nucleation mode of composites and hindered the crystallization rate of PHBV. Data calculated from the results of WAXD demonstrated that lignin did not change the basic crystal structure of PHBV, but decreased the average size of the lamellar stacks. POM results confirmed that the effect of lignin on the crystallization behavior of PHBV carried out in two opposite way, namely the enhanced effect of nucleation and the hindered effect of growth. Besides, the thermal stability of composites was also decreased significantly.

Bioderived and Biodegradable Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Nanocomposites Based on Carbon Nanotubes: Microstructure Observation and EMI Shielding Property Improvement

“…At low CNT contents, the increase in T m could be interpreted by the generation of small PHBV spherulites with higher perfection (see Figure ) induced by the heterogeneous nucleation of CNTs . At higher CNT concentrations, the T m of PHBV specimens decreased slightly due to the agglomeration of CNTs (see Figure i), which restrained the movement of PHBV molecule chains and damaged the perfection degree of PHBV crystallites . These findings were similar to the results reported by Sanchez …”

“…42 At higher CNT concentrations, the T m of PHBV specimens decreased slightly due to the agglomeration of CNTs (see Figure 3i), which restrained the movement of PHBV molecule chains and damaged the perfection degree of PHBV crystallites. 43 These findings were similar to the results reported by Sanchez. 20 POM Analysis.…”

Designing packaging materials with viscoelastic and gas barrier properties by optimized processing of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with lignin

“…The addition of lignin already in the concentration of 1 wt.% modified the crystallization and the melting behavior of PHBHV. For example, Shichao and coworkers reported that alkaline lignin hindered crystallization of PHBHV [39]. Thermal data determined from heating-cooling-heating thermograms are displayed in Table 3.…”

“…Similarly, sugar cane bagasse lignin modified thermal decomposition behavior of PHBHV and deteriorated mechanical properties of PHBHV [34]. Shichao et al [39] reported a modified crystal structure of PHBHV and a decrease of its thermal stability due to an incorporation of 1-10% alkaline lignin. We hypothesize that influence of lignin on PHBHV depends on their interfacial compatibility.…”

Nucleation, Crystallization, and Thermal Fractionation of Poly (ε-Caprolactone)-Grafted-Lignin: Effects of Grafted Chains Length and Lignin Content

“…The effect of lignin content on the isothermal and nonisothermal crystallization kinetics of different polymeric materials has been reported, but none of them deals with PCL. Additionally, a considerable amount of articles study properties of polymer/lignin blends, but crystallization kinetics are not considered.…”