Crystallization behavior, mechanical properties, and environmental biodegradability of poly(β‐hydroxybutyrate)/cellulose acetate butyrate blends

Wang, Tiezhu; Cheng, Guoxiang; Ma, Shuang; Cai, Zengxuan; Zhang, Liguang

doi:10.1002/app.12359

Cited by 49 publications

(49 citation statements)

References 21 publications

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“…[85][86][87][88][89][90][91][92][93] Estudos conduzidos em tais blendas através de DMA e DSC indicam que tanto o PHB como seus copolímeros (PHB-co-HV) formam blendas miscíveis com os derivados de celulose. [85][86][87][88][89][90][91][92][93] Para teores acima de 50% em massa de PHB observa-se uma queda na temperatura de fusão, com o aumento na quantidade de celulose, indicando a miscibilidade do sistema. Por outro lado, para teores de PHB inferiores a 50% em massa, a cristalização do PHB é impedida, sendo obtidas blendas amorfas.…”

Section: Blendas De Phb E éSteres De Celuloseunclassified

“…Porém, observa-se um comportamento inverso destas propriedades quando o PHB começa a cristalizar, o que ocorre para as blendas contendo quantidades superiores a 50% de PHB. 93 Os derivados de celulose causam uma diminuição significativa na temperatura de fusão e na taxa de cristalização do PHB. Para as blendas de PHB e CAB nas composições contendo entre 25 e 40% de PHB a Tg é relativamente menor que a Tg do CAB.…”

Section: Blendas De Phb E éSteres De Celuloseunclassified

See 1 more Smart Citation

Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade

Quental¹,

Carvalho²,

Tada³

et al. 2010

Quím. Nova

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Recebido em 12/5/09; aceito em 29/7/09; publicado na web em 8/1/10 BLENDS OF PHB AND ITS COPOLYMERS: MISCIBILITY AND COMPATIBILITY. Poly(hydroxybutyrate) and its copolymers are linear polyesters behaving as conventional thermoplastic materials. However, they are totally biodegradable and produced by a wide variety of bacteria from renewable sources. Some properties and high production cost are still preventing future applications. In an attempt to improve the properties and to reduce cost blending PHB with others polymeric materials is one of the most efficient method. In this paper, miscibility, compatibility, morphological and mechanical aspects of PHB blends will be reviewed. An extensive revision over twenty last years was realized about works of blends based on PHB and its copolymers.Keywords: blends; PHB; miscibility. INTRODUÇÃO Poli(hidroxibutirato) -PHBO PHB e seus copolímeros são produzidos naturalmente por bactérias a partir de fontes renováveis de energia, e são biodegradados por uma enorme quantidade de bactérias e fungos presentes na natureza. 1,2 No Brasil, a produção de PHB foi desenvolvida por uma joint venture entre a Copersucar (Cooperativa dos Produtores de Canade-açúcar do Estado de São Paulo), o IPT (Instituto de Pesquisas Tecnológicas) e pelo ICB (Instituto de Ciências Biomédicas da USP).3,4 A produção de PHB, encontrou condições excepcionalmente favoráveis no Brasil devido às características da indústria de açúcar e álcool, bastante desenvolvida durante o programa PROALCOOL. A disposição de açúcar a baixos preços e grandes quantidades, que é utilizado como substrato para o crescimento das bactérias do PHB, é uma das principais características que favorecem a produção desse polímero.De 1995 a 2000, a primeira produção em planta piloto do PHB no Brasil, utilizando o processo Copersucar-IPT-ICB, foi realizada na usina de açúcar e álcool Usina da Pedra. Os principais objetivos dessa planta piloto foram testar a viabilidade do processo, desenvolvê-lo e realizar uma avaliação econômica do custo de produção de PHB. 4 Em 2000, a produção comercial de PHB se iniciou com a criação da empresa PHB Industrial, em Serrana, próxima à Usina da Pedra. 4 A produção de PHB pela PHB Industrial é a única produção industrial de PHB a partir de cana-de-açúcar e integrada em usina sucroalcooleira. Essa empresa opera desde 2005 com uma planta de capacidade máxima de 60 toneladas de PHB por ano. "Enquanto na Europa, o PHB é produzido a US$10-20,00/kg, no Brasil esses custos estão entre US$2,5-5,00/kg (...)".3 No entanto, esse preço ainda é muito superior aos preços dos polímeros sintéticos da indústria petroquímica, o que desestimula a ampla comercialização do PHB.A biodegradabilidade não pode ser o único atrativo no PHB ou em qualquer polímero biodegradável. Para ser aceito em larga escala, estes polímeros têm de possuir os atrativos dos termoplásticos convencionais como: (i) suprir a demanda do mercado, ou seja, ser produzido em grande quantidade; (ii) correta compostagem para preservar a sua biodegradação; (iii)...

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Section: Blendas De Phb E éSteres De Celuloseunclassified

Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade

Quental¹,

Carvalho²,

Tada³

et al. 2010

Quím. Nova

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“…12 In fact, this system is miscible over the entire composition range, for no evidence was found for a second lower temperature, T g , as the blends contain more than 60% of PHB. The trend in T g is ascribed to the presence of two mobilization processes in a homogeneous blend.…”

Section: 14mentioning

confidence: 95%

“…12 Our purpose is to find the relationship between the blend morphology and physical properties, but more important is to seek a means of making the best use of this degradable polyester. Unfortunately, we found that the mechanical properties of PHB/CAB blends were not greatly improved to meet the needs of practical use.…”

Section: Introductionmentioning

confidence: 99%

Preparation of cellulose acetate butyrate and poly(ethylene glycol) copolymer to blend with poly(3‐hydroxybutyrate)

Cheng

Wang

Zhao

et al. 2006

J of Applied Polymer Sci

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A two-step procedure was used to synthesize the cellulose acetate butyrate and poly(ethylene glycol) graft copolymer (CAB-g-PEG). By choosing the appropriate composition, the crosslinked graft copolymer or not could be obtained. Then, the CAB-g-PEG copolymer was blended with poly(3-hydroxybutyrate) (PHB), to further improve the mechanical properties of PHB. The results indicated that PHB and CAB-g-PEG that were not crosslinked were miscible over the entire composition range. As the CAB-g-PEG copolymer increased in the PHB/CAB-g-PEG blends, the melting temperature of the blends decreased, the crystallization of PHB became more difficult, and the crystallinity of the blend and PHB phase all decreased. The tensile properties and impact strength of the PHB/CAB-g-PEG blends were superior to the PHB/CAB blends.

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“…PHAs blends with cellulose acetate butyrate, wollastonite, or poly(L-lactide) have been studied, with the aim to enhance hydrolytic or enzymatic biodegradation. [24][25][26] Biodegradability of surface-modified PHAs membranes or films has been attracting much attention in recent years. For example, PHB films with a functionalized surface have been prepared by alkali treatment so as to enhance hydrophilicity and biodegradability in soil.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of PHBV films with different functional groups: Thermal properties and in vitro degradation

Wang

et al. 2010

J of Applied Polymer Sci

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Polyacrylamide was photografted on solution-cast poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) films (amide-PHBV), on which amide groups were transformed into amine groups through Hofmann degradation reaction (amine-PHBV), followed by collagen coupling reaction to prepare collagen-modified PHBV (collagen-PHBV). Amide-, amine-, and collagen-PHBV had higher water absorption and d-spacing values than PHBV, and melting temperatures and enthalpies decreased in the order of collagen-PHBV < amine-PHBV < amide-PHBV < PHBV. Thermal decomposition kinetics of PHBV component in the films has been investigated by means of nonisothermal thermogravimetric and derivative thermogravimetric studies. Applying the Avrami-Erofeev equation with index of 2/5 as the probable kinetic function, the suitable activation energy was calculated by the Friedman method through linear fitting (correlation coefficient > 0.98). The activation energy of PHBV was lower than that of amide-PHBV but higher than that of amine-and collagen-PHBV. Being incubated in phosphate-buffered saline at 37 C, the modified PHBV films showed more weight loss than PHBV during 360 days; however, pH of degradation fluids was nearly neutral as the initial pH was recorded at 7.2. The modified PHBV films with different functional groups may provide an improved biodegradation rate for various cytocompatible biomaterials constructs.

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Crystallization behavior, mechanical properties, and environmental biodegradability of poly(β‐hydroxybutyrate)/cellulose acetate butyrate blends

Cited by 49 publications

References 21 publications

Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade

Blendas de PHB e seus copolímeros: miscibilidade e compatibilidade

Preparation of cellulose acetate butyrate and poly(ethylene glycol) copolymer to blend with poly(3‐hydroxybutyrate)

Surface modification of PHBV films with different functional groups: Thermal properties and in vitro degradation

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