Enhanced mechanical, thermal, and barrier properties of poly (3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)/montmorillonite nanocomposites using silane coupling agent

Abstract

A nanocomposite of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH)/ montmorillonite (MMT) modified with silane coupling agent 3-aminopropyltriethoxysilane (KH550) (PHBH/MMT/KH550) was prepared by solution casting method. The effects of KH550 content on properties of nanocomposites were comparatively investigated. According to the Fourier transform infrared spectra, the new chemical bonding between the PHBH and the MMT was formed by adding KH550. The crystallinity, thermal properties, mechanical properties, and barrier properties of the nanocomposites were improved because of the good dispersion of MMT. Compared with pure PHBH, a 220.05%, 158.25%, and 58.91% improvement in young's modulus, tensile strength, and elongation at break was obtained. The water vapor transmission coefficient was decreased by 113.30%. Moreover, it was notable that the nanocomposite possessed the optimal mechanical properties when the KH550 content was 5 wt%.The obtained results revealed that the nanocomposite will expand the practical application of PHBH base plastics as a substitute of traditional petrochemical materials.

Insight into the complex coupling agents on thermal, mechanical, and barrier properties of lignin‐poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) biocomposites

“…[ 20 ] In addition, the silane coupling agent first hydrolyzes in ethanol to form SiOH, which is then dehydrated with the hydroxyl group on the surface of lignin to form SiOM covalent bond (M represents the surface of lignin particles). [ 21 ] Compared with EHL/P composite, the hydroxyl peaks of TL/P and MTL/P are weakened at 3440 cm −1 . At the same time, the symmetric stretching vibration peaks of CH 2 at 2965 cm −1 in TL/P and MTL/P are enhanced.…”

Investigation on improvement of thermal, mechanical, and barrier properties of lignin/poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) using inorganic nanoparticles as fillers

“…According to our previous reported work, 2 g of PHBH was fully dissolved in 40 ml of DMF solution, and 3 wt% of lignin was completely dispersed in 10 ml of DMF solution. [ 26 ] The two solutions were mixed together at 55°C for 1 h in a magnetic stirrer, and ultrasonically dispersed for 1 h until they were completely mixed. Finally, the mixture was quickly poured onto a glass plate and evaporated at 55°C for 2 h to obtain the Lignin/PHBH (L/P) composite film, which was defined as L/P.…”

Multifunctional montmorillonite/polyhydroxy butyrate composites using surfactant structure modulation strategy for packaging applications

“…8,[12][13][14] The addition of montmorillonite (MMT), which has a low-cost, sizable specific surface area, and distinctive layered structure (as in Figure 1), is an efficient way to enhance the properties of PHB, therefore further reducing the cost and enlarging the limited processing window. 5,8,[15][16][17][18] However, the two dissimilar polarities of MMT and PHB will cause weak interfacial bonding and serious agglomeration during the blending process. [16][17][18] Some research has already been conducted to improve the contact force between MMT and matrix by adjusting hydrophobicity.…”