Comparative study of PHBV/TBP and PHBV/BPA blends

Abstract

In order to clarify the effects of phenols on properties of polyesters, the blends of poly[(3‐hydroxybutyrate)‐co‐(3‐hydroxyvalerate)] (PHBV) with 4,4′‐dihydroxydiphenylpropane (BPA) and p‐tert‐butylphenol (TBP) were studied. The FTIR spectra revealed that there was strong hydrogen‐bond (H‐bond) interaction between PHBV and both phenols. By evaluating the fraction of H‐bonded CO in the blend, it was concluded that BPA showed a stronger tendency than TBP to form H‐bonds with PHBV. Accordingly, BPA formed a stronger suppression than TBP on the crystallization of PHBV. When 30 wt% BPA or 50 wt% TBP were added into PHBV, the crystallization of PHBV was completely suppressed in the DSC cooling scan. As the phenol content was increased, the Tg of PHBV/TBP blend decreased while the Tg of PHBV/BPA blend increased. This difference indicated that TBP and BPA acted as plasticizer and physical crosslinking agent, respectively. Copyright © 2004 Society of Chemical Industry

Miscibility of Blends of Biodegradable Polymers and Copolymers with Different Plasticizers

“…[9][10][11][12][13][14] However, the PHB possesses low thermal stability and is thermo-oxidatively degraded at a few degrees above its fusion temperature and with its high degree of crystallinity it confers low impact resistance. These drawbacks have urged the development of different strategies to improve its properties.…”

“…Recent studies have pointed out the use of elastomeric materials and plasticizers as an adequate second component of the PHB blends to achieve biodegradability and promote a better interfacial adhesion. [10][11][12] Specifically, the penetration of a small amount of a solvent plasticizer through the polymer matrix causes a partial relaxation of the polymer chains by reducing the intermolecular forces of attraction thus producing higher freedom of movement. The result is a change in the material properties, both greater flexibility and plasticity and lower tensile strength and glass transition temperature.…”

“…On the other hand, a shoulder is noticed at high wavelength (l % 350 nm) which can be caused by the tendency of BPF to self-assembly, as also seen for blends of PHBHV with other diphenolic plasticizers, such as 4,4 0 -dihydroxydiphenylpropane, in their FT-IR spectra. [11] From the spectra corresponding to the 12 systems measured, the degree of association has been calculated with Equation (10) (values not shown) and illustrated in Figure 4 as a function of the blend molar ratio. For the sake R. García-Lopera, I. S. Monzó, I. Porcar, C. Abad, A. Campos Figure 2.…”

Particular thermal properties of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) oligomers

“…However, the commercial PHBV has some disadvantages including brittleness, high melting temperature, bad thermal stability, high crystallinity, and so on [7][8][9][10][11][12][13][14]. Various solutions have been used to solve the above problems, including physical blending [5][6][7][8][9][13][14][15], surface modification [16], grafting [17] and cross-linking copolymerization [18], block copolymerization [19][20][21][22][23][24][25][26][27][28] and biosynthesis [29]. Block copolymerization can be an effective way to modify PHBV because block copolymers has the potential Electronic supplementary material The online version of this article (doi:10.1007/s10965-011-9756-6) contains supplementary material, which is available to authorized users.…”

Effects of Lignophenols on Mechanical Performance of Biocomposites Based on Polyhydroxybutyrate (PHB) and Polypropylene (PP) Reinforced with Pulp Fibers

“…Although relatively few hydroxyl and carboxylic acid groups are present at the ends of PHB molecular chains, it is possible that dipolar interactions occur among the moderately polar (-C=O) and polar groups (-OH and -COOH) of PHBV and the hydroxyl group (-OH) of cellulosic wood fiber. Thus, interfacial interactions could take place between the fiber and the matrix (Jotier et al 1988;Fei et al 2004).…”