Effect of Gamma Radiation on the Properties of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)/Poly(ε-Caprolactone) Blends

Rosário, Francisco; Corradini, Elisângela; Casarin, Suzan Aline; Agnelli, José Augusto Marcondes

doi:10.1007/s10924-013-0573-3

Cited by 15 publications

(13 citation statements)

References 20 publications

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“…To verify if any gel fraction was formed in Cast PHBV and C-PHBV/3C30B bionanocomposite samples during gamma irradiation exposure, solubility test was performed. Approximately 1 g of dry irradiated and non-irradiated Cast PHBV and C-PHBV/3C30B bionanocomposite samples were placed in a Soxhlet apparatus and extracted with 100 ml of chloroform at 60°C for 1 h [17].…”

Section: Solubility Testmentioning

confidence: 99%

The Effects of Gamma Irradiation on Molecular Weight, Morphology and Physical Properties of PHBV/ Cloisite 30B Bionanocomposites

Iggui

Kaci

Mahlous

et al. 2019

Journal of Renewable Materials

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In this paper, the effects of gamma irradiation on Cast poly(3hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and PHBV/Cloisite 30B (C30B) (3 wt%) bionanocomposite prepared by melt compounding, were evaluated at various doses, i.e., 5, 15, 20, 50 and 100 kGy at room temperature in air. Changes in molecular weight, morphology and physical properties were investigated. The study showed that the main degradation mechanism occurring in gamma irradiation in both Cast PHBV and C-PHBV/3C30B bionanocomposite is chain scission, responsible for the decrease of molecular weight. Differential scanning calorimetry (DSC) data indicated a regular decrease in crystallization temperature, melting temperature and crystallinity index for all irradiated samples with increasing the dose. Further, DSC thermograms of both Cast PHBV and PHBV bionanocomposite exhibited double melting peaks due probably to changes in the PHBV crystal structure. Tensile and DMA data showed a reduction in Young's modulus, strength, elongation at break and storage modulus with the radiation dose; the decrease was however more pronounced for Cast PHBV. The morphological damages were much less pronounced for the PHBV bionanocomposite sample compared to Cast PHBV, for which some irregularities and defects were observed at 100 kGy. This study highlighted the ability of C30B to counterbalance the detrimental effect of radiolytic degradation on the functional properties of PHBV up to 100 kGy, thus acting as a potential anti-rad.

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Section: Solubility Testmentioning

confidence: 99%

The Effects of Gamma Irradiation on Molecular Weight, Morphology and Physical Properties of PHBV/ Cloisite 30B Bionanocomposites

Iggui

Kaci

Mahlous

et al. 2019

Journal of Renewable Materials

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“…Values of 93.7 J g -1 [40], 139 J g -1 [7,9] and 109 J g -1 [39,40] were respectively used for PLA, PCL and PHBV.…”

Section: Characterizationmentioning

confidence: 99%

“…PHBV, a nine carbon membered carbon thermoplastic polymer, has been mainly used for medical applications because it is non-toxic and compatible with the human body, but it suffers from low thermal stability and brittleness due to its high degree of crystallinity. This is a limiting factor for its use in the packaging industry, because it will have to be prepared using solvents to avoid thermal degradation when processing through melt mixing [3,[5][6][7]. PCL, a six carbon membered thermoplastic with hydroxyl terminated end groups, is a rubbery polymer with good ductility because of its low glass transition temperature of -61 °C, and a good thermal stability with a moderate degree of crystallinity [3,[8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Very little information is available on the mechanical properties of PHBV/PCL blends [7,35], and none on the introduction of particulate fillers into these blends. A study of the dynamic mechanical properties of irradiated samples of these blends showed that the glass transition temperature of PCL increased and the intensity of the tan δ peaks decreased in the presence of PHBV.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic mechanical properties of PLA/PHBV, PLA/PCL, PHBV/PCL blends and their nanocomposites with TiO2 as nanofiller

Mofokeng

Luyt

2015

Thermochimica Acta

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“…where ∆H m is the enthalpy of melting and ∆H m • is the enthalpy of melting of the 100% crystalline polymer (139 J/g) [24,25].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

PDMAEMA/Polyester Miktopolymers: Synthesis via In-Out Approach, Physicochemical Characterization and Enzymatic Degradation

Kupczak¹,

Mielańczyk²,

Neugebauer³

2021

Materials

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Synthesis, physicochemical characterization, and the enzymatic degradation of the amphiphilic miktoarm star-shaped polymers is reported herein. First, star-shaped macroinitiators, based on N,N′-dimethylaminoethyl methacrylate (DMAEMA) and glycerol dimethacrylate (GDMA) ((PDMAEMA)n-PGDMA), were synthesized. Due to the presence of hydroxyl groups in the macroinitiator core, polyesters such as poly(ɛ-caprolactone) (P(ɛ-CL)), polylactide (PLA) and poly(lactide-co-glycolide) (PLGA) were synthesized using ring opening polymerization (ROP). Comprehensive degradation studies on enzymatic degradation, using a lipase from Pseudomonas cepacia, were performed. Enzymatic degradation was monitored by weight measurements and nuclear magnetic resonance spectroscopy (1H NMR). The fastest degradation rate was observed for the polymer with the lowest molecular weight. Amphiphilic miktopolymers may find application as biomaterials for long- or mid-term period drug-delivery systems.

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Effect of Gamma Radiation on the Properties of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)/Poly(ε-Caprolactone) Blends

Cited by 15 publications

References 20 publications

The Effects of Gamma Irradiation on Molecular Weight, Morphology and Physical Properties of PHBV/ Cloisite 30B Bionanocomposites

The Effects of Gamma Irradiation on Molecular Weight, Morphology and Physical Properties of PHBV/ Cloisite 30B Bionanocomposites

Dynamic mechanical properties of PLA/PHBV, PLA/PCL, PHBV/PCL blends and their nanocomposites with TiO2 as nanofiller

PDMAEMA/Polyester Miktopolymers: Synthesis via In-Out Approach, Physicochemical Characterization and Enzymatic Degradation

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