Biodegradation of microbial copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)

Doi, Yoshiharu; Kanesawa, Youko; Kunioka, Masao; Saito, Terumi

doi:10.1021/ma00203a006

Cited by 365 publications

(185 citation statements)

References 18 publications

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“…In this case, the activation energy values for PLA-REX and PLA-REX-C were 193 and 216 kJ mol −1 , respectively. Several authors argued that thermal and hydrolysis reactions for biopolymers could be generated by random chain scission reactions of ester groups [80,81]. This is in accordance with our kinetic findings.…”

Section: Kinetics Of the Thermal Decomposition: Elucidation Of Reactisupporting

confidence: 93%

PLA-OMMT nanocomposites manufactured by reactive extrusion

Carrasco¹,

Santana²,

Cailloux³

et al. 2017

Biodegradable Polymers: Recent Developments and New Perspectives

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Section: Kinetics Of the Thermal Decomposition: Elucidation Of Reactisupporting

confidence: 93%

PLA-OMMT nanocomposites manufactured by reactive extrusion

Carrasco¹,

Santana²,

Cailloux³

et al. 2017

Biodegradable Polymers: Recent Developments and New Perspectives

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“…16 Under the conditions in this work, the same was confirmed, as seen in Figure 4. Two PCL samples were prepared.…”

Section: Effects Of Polymer Shape On Biodegradability Of Pclb-pva Copsupporting

confidence: 77%

Morphology and Biodegradability of Poly(ε-caprolactone)/Poly(vinyl alcohol) Block Copolymers

Zhou

Nishimura

Takasu

et al. 2004

Polym J

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ABSTRACT:Poly("-caprolactone)-block-poly(vinyl alcohol) (PCL-b-PVA) copolymers were prepared by using a bifunctional initiator 4-(2-hydroxyethoxy)-benzaldehyde (4-HEBA), which could respond to both ring-opening polymerization and aldol-type group transfer polymerization. Morphological changes along with block length ratios were observed with differential scanning calorimeter and polarized optical microscope. Increment of PVA block influenced the crystallizing manner of PCL block. Biodegradability of PCL-b-PVA copolymers, two homopolymers (PCL and PVA), and PCL/PVA blend was evaluated from biochemical oxygen demand (BOD) in the presence of activated sludge. Under the conditions in this study, the biodegradation behavior of PCL-b-PVA copolymer was influenced by shape of sample. Increment of the PVA block in PCL-b-PVA copolymers slowed down biodegradation rates. When the content of PVA block in the block copolymer increased to more than 25 mol %, the biodegradation of PCL moiety was effectively inhibited even after much longer exposure time.

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“…Several authors [3,4] reported that the residual water or moisture content inside the polymer matrix activates hydrolysis reactions (Figure 1a) implying the split-up of the ester linkage into alcohol and acid carboxylic groups. Doi et al [5] as well as Yu et al [6] argued that thermal and hydrolysis reactions for biocopolymers could be generated by random chain scission reactions of the ester groups following a mathematical model depending on its own composition. Coupled with these two last mechanisms, intra-( Figure 1c) and intermolecular ( Figure 1d) transesterification reactions could also cause a drop in molecular weight at longer reaction times [7,8].…”

Section: Introductionmentioning

confidence: 99%

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

Cailloux¹,

Santana

Urquiza³

et al. 2013

Express Polym. Lett.

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Abstract. One-step reactive extrusion-calendering process (REX-Calendering) was used in order to obtain sheets of 1mm from two PD,L-LA extrusion grades modified with a styrene-acrylic multifunctional oligomeric agent. In a preliminary internal mixer study, torque versus time was monitored in order to determine chain extender ratios and reaction time. Once all parameters were optimized, reactive extrusion experiments were performed. Independently of the processing method employed, under the same processing conditions, PD,L-LA with the lower D enantiomer molar content revealed a higher reactivity towards the reactive agent, induced by its higher thermal sensitivity. REXCalendering process seemed to minimize the degradations reactions during processing, although a competition between degradation and chain extension/branching reactions took place in both processes. Finally, the rheological characterization revealed a higher degree of modification in the melt rheological behaviour for REX-Calendered samples.

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Biodegradation of microbial copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)

Cited by 365 publications

References 18 publications

PLA-OMMT nanocomposites manufactured by reactive extrusion

PLA-OMMT nanocomposites manufactured by reactive extrusion

Morphology and Biodegradability of Poly(ε-caprolactone)/Poly(vinyl alcohol) Block Copolymers

Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis

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