Fabrication of Novel Polyhydroxybutyrate-co-Hydroxyvalerate (PHBV) Mixed with Natural Rubber Latex

Abstract

Polyhydroxybutyrate-co-hydroxyvalerate (PHBV) is mixed with natural rubber latex to make better mechanical properties of PHBV. The various ratios between PHBV and natural rubber latex are examined to improve their mechanical properties. The PHBV are solid, easily broken, while natural rubber is excessive elastic materials. Concentrations of the employed PHBV solution are 1, 2, and 3 (%w/v). The mixtures of this solution to natural rubber latex are fabricated the biofilms in three different ratios, 4:6, 5:5, and 6:4, respectively. The films are characterized by electron microscope, universal testing machine, and differential scanning calorimetry (DSC). The electron micrographs of the mixed films and unmixed PHBV yield the lowest void distributions in 3%w/v PHBV. For mechanical properties, the averaged elastic moduli of 1, 2, and 3 (%w/v PHBV) mixed films are 773, 955 and 1,008 kPa, respectively. Their tensile strengths increase with increasing the PHBV concentrations. A similar trend is also found in elastic modulus. The crystallization and melting behavior of pure PHBV and the mixed films are examined by DSC. Melting transition temperatures of pure PHBV exhibit two melting peaks at 154°C and 173°C. In addition, the melting peaks of the mixed films remain in the range of 152-156°C and 168-171°C, respectively. According to their morphology, void distributions reduce twice, compared to the unmixed PHBV. Mechanical properties and thermal analysis indicate that the mixed PHBV can be improved their properties with more resilient and wide range temperature than usual.

Unidirectional Rubber-Toughened Green Composites Based on PHBV

“…The increase is considered likely to be due to a refinement of the crystalline structure of PHBV created by PBAT addition, since the PBAT particles were finely dispersed throughout the matrix (Figure 8) and could have acted as a nucleating agent. The reduction in melting temperature caused by ENR addition is consistent with the findings of Kuntanoo et al [44] for an unreinforced PHBV/natural rubber latex 50:50 blend. They found that the T m was reduced by 3 • C from that of neat PHBV.…”

Tensile Strength of PHBV/Natural Rubber Latex Mixtures

“…This biopolymer is presented itself as the biodegradable polymer and aliphatic polyesters because of naturally synthesized materials from renewable supplies. According to the study of Kuntanoo and others (2015) [4][5], the PHBV chains additionally reveal crystalline conformations and the co-monomer dispersion specifies statistically arbitrary. The main copolymer consists of two copolymers, 3HV (hydroxyvalerate) and 3HB (hydroxybutyrate), which their properties depend on the HV specialty.…”

“…Mechanical property is one of some modifications to improve PHBV, for example chemical modification or physical blending. The latter is desired because of rapid, simple, and lowexpense functioning performances [4].…”