Properties and Degradation Performances of Biodegradable Poly(lactic acid)/Poly(3-hydroxybutyrate) Blends and Keratin Composites

Danko, Martin; Mosnáčková, Katarína; Vykydalová, Anna; Kleinová, Angela; Puškárová, Andrea; Pangallo, Domenico; Bujdoš, Marek; Mosnáček, Jaroslav

doi:10.3390/polym13162693

Cited by 14 publications

(11 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GPC analysis is facilitated by the study of the aging mechanism for polymers doped with inorganic fillers . The sonocatalytic aging effect of the different inorganic particles on the polymers has been investigated by GPC .…”

Section: Characterization For Substantial Chain Changes Of Polymersmentioning

confidence: 99%

“…The slowly declined CL/EG ratio in the first 12 days was a result of the hydrolysis of PCCL segments. Moreover, the aging of polylactic acid/poly(3-hydroxybutyrate) (PLA/PHB) blends and composites doped with keratin were studied by NMR spectroscopy . The ratio of integrations of methyl in PLA (∼1.56 ppm) and PHB (∼1.26 ppm) was studied before and after aging.…”

Section: Characterization For Chain Scission/cross-linking In Acceler...mentioning

confidence: 99%

“…Moreover, the aging of polylactic acid/poly(3hydroxybutyrate) (PLA/PHB) blends and composites doped with keratin were studied by NMR spectroscopy. 178 The ratio of integrations of methyl in PLA (∼1.56 ppm) and PHB (∼1.26 ppm) was studied before and after aging. This ratio decayed after the aging, and the addition of keratin could strengthen this decrease by accelerating the hydrolytic aging.…”

Section: Peak Assignment and Spectral Analysis By Nmr For Aged Polymersmentioning

confidence: 99%

“…22 GPC analysis is facilitated by the study of the aging mechanism for polymers doped with inorganic fillers. 178 The sonocatalytic aging effect of the different inorganic particles on the polymers has been investigated by GPC. 194 GPC profiles of 2-hydroxyethyl cellulose (HEC) in the presence of TiO 2 , MMT, ZnO and Fe 3 O 4 showed a sequence of narrowed peaks as Fe 3 O 4 > Rutile-TiO 2 > ZnO > anatase-TiO 2 > MMT.…”

Section: Monitoring the Molecular Weight By Gel Permeation Chromatogr...mentioning

confidence: 99%

See 3 more Smart Citations

Characterization Techniques of Polymer Aging: From Beginning to End

Tian

Lin

et al. 2023

Chem. Rev.

View full text Add to dashboard Cite

Polymers have been widely applied in various fields in the daily routines and the manufacturing. Despite the awareness of the aggressive and inevitable aging for the polymers, it still remains a challenge to choose an appropriate characterization strategy for evaluating the aging behaviors. The difficulties lie in the fact that the polymer features from the different aging stages require different characterization methods. In this review, we present an overview of the characterization strategies preferable for the initial, accelerated, and late stages during polymer aging. The optimum strategies have been discussed to characterize the generation of radicals, variation of functional groups, substantial chain scission, formation of low-molecular products, and deterioration in the polymers' macro-performances. In view of the advantages and the limitations of these characterization techniques, their utilization in a strategic approach is considered. In addition, we highlight the structure−property relationship for the aged polymers and provide available guidance for lifetime prediction. This review could allow the readers to be knowledgeable of the features for the polymers in the different aging stages and provide access to choose the optimum characterization techniques. We believe that this review will attract the communities dedicated to materials science and chemistry.

show abstract

Section: Characterization For Substantial Chain Changes Of Polymersmentioning

confidence: 99%

Section: Characterization For Chain Scission/cross-linking In Acceler...mentioning

confidence: 99%

Section: Peak Assignment and Spectral Analysis By Nmr For Aged Polymersmentioning

confidence: 99%

Section: Monitoring the Molecular Weight By Gel Permeation Chromatogr...mentioning

confidence: 99%

See 2 more Smart Citations

Characterization Techniques of Polymer Aging: From Beginning to End

Tian

Lin

et al. 2023

Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…Among these, poly(3-hydroxybutyrate) [P(3HB)] is the most abundant PHA in nature and is produced by many microbes. Although the brittleness of P(3HB) has limited its practical use, recent studies have developed several applications by blending P(3HB) with other polymers, such as soy protein fibers [ 14 ], chitosans [ 15 ], and PLAs [ 16 ]. Another effective strategy to reduce brittleness is random copolymerization, which induces increased ductility of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Versatile aliphatic polyester biosynthesis system for producing random and block copolymers composed of 2-, 3-, 4-, 5-, and 6-hydroxyalkanoates using the sequence-regulating polyhydroxyalkanoate synthase PhaCAR

et al. 2022

View full text Add to dashboard Cite

Background Polyhydroxyalkanoates (PHAs) are microbial polyesters synthesized by PHA synthases. Naturally occurring PHA copolymers possess a random monomer sequence. The development of PhaCAR, a unique sequence-regulating PHA synthase, has enabled the spontaneous biosynthesis of PHA block copolymers. PhaCAR synthesizes both a block copolymer poly(2-hydroxybutyrate)-b-poly(3-hydroxybutyrate) [P(2HB)-b-P(3HB)], and a random copolymer, poly(3HB-co-3-hydroxyhexanoate), indicating that the combination of monomers determines the monomer sequence. Therefore, in this study, we explored the substrate scope of PhaCAR and the monomer sequences of the resulting copolymers to identify the determinants of the monomer sequence. PhaCAR is a class I PHA synthase that is thought to incorporate long-main-chain hydroxyalkanoates (LMC HAs, > C3 in the main [backbone] chain). Thus, the LMC monomers, 4-hydroxy-2-methylbutyrate (4H2MB), 5-hydroxyvalerate (5HV), and 6-hydroxyhexanoate (6HHx), as well as 2HB, 3HB, and 3-hydroxypropionate (3HP) were tested. Results Recombinant Escherichia coli harboring PhaCAR, CoA transferase and CoA ligase genes was used for PHA production. The medium contained the monomer precursors, 2HB, 3HB, 3HP, 4H2MB, 5HV, and 6HHx, either individually or in combination. As a result, homopolymers were obtained only for 3HB and 3HP. Moreover, 3HB and 3HP were randomly copolymerized by PhaCAR. 3HB-based binary copolymers P(3HB-co-LMC HA)s containing up to 2.9 mol% 4H2MB, 4.8 mol% 5HV, or 1.8 mol% 6HHx were produced. Differential scanning calorimetry analysis of the copolymers indicated that P(3HB-co-LMC HA)s had a random sequence. In contrast, combining 3HP and 2HB induced the synthesis of P(3HP)-b-P(2HB). Similarly, P(2HB) segment-containing block copolymers P(3HB-co-LMC HA)-b-P(2HB)s were synthesized. Binary copolymers of LMC HAs and 2HB were not obtained, indicating that the 3HB or 3HP unit is essential to the polymer synthesis. Conclusion PhaCAR possesses a wide substrate scope towards 2-, 3-, 4-, 5-, and 6-hydroxyalkanoates. 3HB or 3HP units are essential for polymer synthesis using PhaCAR. The presence of a 2HB monomer is key to synthesizing block copolymers, such as P(3HP)-b-P(2HB) and P(3HB-co-LMC HA)-b-P(2HB)s. The copolymers that did not contain 2HB units had a random sequence. This study’s results provide insights into the mechanism of sequence regulation by PhaCAR and pave the way for designing PHA block copolymers.

show abstract

Preparation of Sustainable Composite Materials from Bio‐Based Domestic and Industrial Waste: Progress, Problems, and Prospects‐ A Review

Rehman,

Ullah,

Sajid

et al. 2024

Advanced Sustainable Systems

View full text Add to dashboard Cite

Bio‐based waste from households and industries is a big problem for the world, however, turning it into valuable composite materials can offer a promising approach to deal with it. It involves the conversion of waste from different bio‐based sources such as cellulose waste from farming and forestry leftovers, chitin waste from seafood and mushrooms, and keratin waste from hair, nails, and feathers into natural fibers. These fibers are then effectively mixed with other materials to create composite materials having unique properties, such as high strength and stiffness, good thermal and electrical conductivity, and better barrier properties. Developing these materials is not just good for the environment because it reduces landfill waste and the reliance on non‐renewable resources, but it can also make economic sense for producers. In this review, the basic compounds of natural fibers and the development of composite materials from them are explored and discussed in detail. Furthermore, their chemical and mechanical properties are discussed and summarized. In the final section, a brief overview of the challenges and the future research needed in this fast‐evolving field is given.

show abstract

Properties and Degradation Performances of Biodegradable Poly(lactic acid)/Poly(3-hydroxybutyrate) Blends and Keratin Composites

Cited by 14 publications

References 50 publications

Characterization Techniques of Polymer Aging: From Beginning to End

Characterization Techniques of Polymer Aging: From Beginning to End

Versatile aliphatic polyester biosynthesis system for producing random and block copolymers composed of 2-, 3-, 4-, 5-, and 6-hydroxyalkanoates using the sequence-regulating polyhydroxyalkanoate synthase PhaCAR

Preparation of Sustainable Composite Materials from Bio‐Based Domestic and Industrial Waste: Progress, Problems, and Prospects‐ A Review

Contact Info

Product

Resources

About