Raman microspectroscopy study of structure, dispersibility, and crystallinity of poly(hydroxybutyrate)/poly(l-lactic acid) blends

Furukawa, T.; Sato, Harumi; Murakami, Rumi; Zhang, Jianming; Noda, Isao; Ochiai, Shukichi; Ozaki, Yukihiro

doi:10.1016/j.polymer.2006.03.010

Cited by 103 publications

(70 citation statements)

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“…Our previous microspectroscopic studies showed the 20/80 blend is the most homogeneous one among all the blends. 29,30 As expected, the STD of the 20/80 blend shows an especially small value for both components classified to PHB and PLLA, respectively. Thus, it was shown that the score images and their histograms for PHB and PLLA classes together provide the complementary qualitative and quantitative results, indicating that the PHB/PLLA blends studied have a high degree of homogeneity.…”

Section: Nir Spectra Of Neat Phb and Pllasupporting

confidence: 76%

“…[23][24][25][26][27][28][29][30] In our previous studies, the miscibility and dispersibility of PHB/PLLA blends were revealed by IR and Raman microspectroscopy. 29,30 These studies showed that the PHB component is always crystallized in the blends irrespective of the blend ratio, and that both components are mixed in the nonspherulite parts. However, these studies were carried out in only some localized spots of samples with different morphology by using polarized light microscopy.…”

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confidence: 99%

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Evaluation of Homogeneity of Binary Blends of Poly(3-hydroxybutyrate) and Poly(l-lactic acid) Studied by Near Infrared Chemical Imaging (NIRCI)

et al. 2007

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IntroductionPoly((R)-3-hydroxybutyrate) (PHB) and poly(L-lactic acid) (PLLA) are well-studied aliphatic biodegradable polymers. PHB synthesized by bacteria is a biodegradable thermoplastic. [1][2][3][4][5][6][7] PHB has received much attention as a environmentally friendly material because of its thermoplasticity coupled with its biodegradability. However, it has been recognized that PHB is often too rigid and stiff for many applications because of the perfectly isotactic structure consisting exclusively of the R configuration. PLLA produced from renewable resources, such as starch, also is a biodegradable and biocompatible thermoplastic. [7][8][9][10][11] PLLA has already been used in various applications, especially in the medical field, because of its superior biocompatibility. The crystalline structures of PHB and PLLA have been established as orthorhombic systems by means of wide angle X-ray diffraction (WAXD). 12-16The thermal behavior of PHB and PLLA have also been investigated by infrared (IR) spectroscopy, differential scanning calorimetry (DSC), and WAXD. [17][18][19][20][21][22] The physical and mechanical properties of PHB and PLLA are not always suitable for practical applications. Several modifications have been proposed to improve their processing and mechanical properties, such as copolymerization and blending with other biodegradable polymers. Compared to copolymerization methods, physical blending is an easier and faster way to manipulate the desired properties of polymeric materials. Several studies of the miscibility and morphology for PHB/PLLA blends have been published. [23][24][25][26][27][28][29][30] In our previous studies, the miscibility and dispersibility of PHB/PLLA blends were revealed by IR and Raman microspectroscopy. 29,30 These studies showed that the PHB component is always crystallized in the blends irrespective of the blend ratio, and that both components are mixed in the nonspherulite parts. However, these studies were carried out in only some localized spots of samples with different morphology by using polarized light microscopy. Thus, the blends were not analyzed in much wider areas encompassing the entire composite material.Near infrared (NIR) spectroscopy is widely used as a tool for materials characterization. [31][32][33][34] In the NIR region (800 -2500 nm), the overtone and combination bands of the C-H, O-H, and N-H stretching and deformation vibrational modes provide highly specific molecular information for species identification. Sample preparation and handling are relatively straightforward for NIR spectroscopy. Multivariate data analysis has also accelerated the application of NIR spectroscopy. [35][36][37][38] Therefore, NIR spectroscopy has often been adopted as a useful probe in studying polymers. For example, the isothermal crystallization kinetics of PHB was investigated by NIR spectroscopy. 39 An NIR on-line monitoring system has proven to be useful in the quantitative analysis of the molten polyolefin polymers [40][41][42][43] and in the tracking of the ...

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Section: Nir Spectra Of Neat Phb and Pllasupporting

confidence: 76%

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confidence: 99%

Evaluation of Homogeneity of Binary Blends of Poly(3-hydroxybutyrate) and Poly(l-lactic acid) Studied by Near Infrared Chemical Imaging (NIRCI)

et al. 2007

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“…Os espectros de PHB (Figura 1 e 2) e blenda (Figura 3) foram normalizados pela intensidade de absorbância de uma banda considerada como padrão interno em 1380 cm -1 , atribuída à deformação simétrica de grupos CH 3 [14,15,16] , e desconvoluídos pela função Lorentziana para obter melhor resolução das bandas (separação em picos) [17] .…”

Section: Resultado E Discussãounclassified

“…A Tabela 3 compara os índices carbonila de fase amorfa (1748 cm -1 ) e de fase cristalina (1719 cm -1 ) [15,16] dos filmes de PHB e da blenda de PP/PHB originais e biotratados em água do Rio Atibaia antes e após o descarte do efluente (valores extraídos das Figura 1c, d). Na Tabela 4 estão apresentados os índices de fase amorfa e cristalina do PHB, obtidos, respectivamente, dos valores de absorbância da banda em 1186 cm -1 atribuída ao estiramento simétrico de grupo C-O-C e da banda em 1230 cm -1 atribuída à conformação helicoidal de cadeia, em relação à banda de referência em 1380 cm -1 , mantida como padrão interno [14,16] .…”

Section: Resultado E Discussãounclassified

Biodegradação de filmes de polipropileno (PP), poli(3-hidroxibutirato) (PHB) e blenda de PP/PHB por microrganismos das águas do Rio Atibaia

Faria

Martins-Franchetti

2010

Polímeros

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Resumo: O propósito deste estudo é investigar a biodegradação de filmes de PHB, PP e blenda de PP/PHB (1:1) por microrganismos de águas de rio poluído que recebeu vários tipos de descartes, inclusive de refinaria de petróleo. Os filmes poliméricos foram obtidos por fusão do pó do material a 175 °C, prensados a 71,3 kgf.cm -2 e resfriados a 25 °C. Estes filmes foram mantidos em amostras de águas do rio poluído, coletadas antes e após o descarte do efluente da refinaria de petróleo e mantidas em estufa bacteriológica a 28 °C, durante 120 dias. As mudanças, causadas pela ação microbiana nos filmes, foram analisadas por medidas de perda de massa, infravermelho com transformada de Fourier (FTIR) e microscopia eletrônica de varredura (MEV). Os resultados provaram que a degradação do PHB ocorre tanto na sua fase amorfa como na cristalina, sendo mais significativa na água do rio que recebeu o efluente da refinaria de petróleo, contendo microrganismos reconhecidos como potencialmente capazes de degradar substâncias persistentes no meio ambiente. Palavras-chave: Biodegradação, PP, PHB, blendas, microrganismos, rio poluído. Biodegradation of Polypropylene (PP), Poly(3-hydroxybutyrate) (PHB) Films and PP/PHB Blend by Microorganisms from Atibaia RiverAbstract: The purpose of this study is to investigate the biodegradation of films made with PP, PHB and PP/PHB (1:1) blend caused by microorganisms from polluted river which received several types of waste, including an oil refinery effluent. The films were obtained by melting the powder from the material at 175 °C, pressed at 71.3 kgf.cm -2 and cooled at 25 °C. These films were kept in polluted river water samples, collected before and after the discarding of oil refinery waste, and they were kept in the bacteriological incubator at 28 °C for 120 days. The changes caused by microbial action on the films were analyzed by measurements of weight loss, Fourier transform infrared (FTIR) and scanning electronic microscopy (SEM). The results proved that PHB degradation occurs in amorphous and crystalline phases, being more significant in the river water which received refinery oil waste, containing microorganisms recognized as potentially capable to degrade recalcitrant substances in the environment. Keywords: Biodegradation, PP, PHB, blends, microorganisms, polluted river. IntroduçãoOs polímeros sintéticos tornaram-se importantes na sociedade porque podem substituir materiais como: papel, madeira, vidro e metal, solucionando grande número de problemas, quer na indústria, na agricultura, na medicina e em outras áreas. Isso se deve às características como: durabilidade, atoxicidade, baixo custo, facilidade para serem moldados, capacidade de serem reciclados e versatilidade de aplicação. O mercado de resinas plásticas tem aumentado ultimamente, significando uma expansão da indústria petroquímica, que movimenta a economia e gera empregos em diversos segmentos do setor [1,2] . Entretanto, o uso e o descarte indevidos dos materiais plásticos, aliados a sua resistência à degradação acabam g...

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“…The Raman shift band of HAp at 430cm -1 corresponds to the axisymmetric deformation of PO 4 , and the shifts between 550 and 600cm -1 are superimposed with the Raman shifts of PHB; these shifts are related to the deformation of -CCO-and -C-CH 3 groups. 7 It is also possible to observe that the C2 scaffold has lower-intensity HAp peaks compared with those of the C1 scaffold. This result may be related to a lower concentration of HAp in these membranes.…”

Section: Membrane Characterizationmentioning

confidence: 99%

Effect of Electrospun Phb and Hap-Phb Composite Scaffolds Characteristics on Mesenchymal Stem Cell Growth Viability

Viezzer¹,

Forte²,

Berutti³

et al. 2017

MOJABB

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Raman microspectroscopy study of structure, dispersibility, and crystallinity of poly(hydroxybutyrate)/poly(l-lactic acid) blends

Cited by 103 publications

References 42 publications

Evaluation of Homogeneity of Binary Blends of Poly(3-hydroxybutyrate) and Poly(l-lactic acid) Studied by Near Infrared Chemical Imaging (NIRCI)

Evaluation of Homogeneity of Binary Blends of Poly(3-hydroxybutyrate) and Poly(l-lactic acid) Studied by Near Infrared Chemical Imaging (NIRCI)

Biodegradação de filmes de polipropileno (PP), poli(3-hidroxibutirato) (PHB) e blenda de PP/PHB por microrganismos das águas do Rio Atibaia

Effect of Electrospun Phb and Hap-Phb Composite Scaffolds Characteristics on Mesenchymal Stem Cell Growth Viability

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