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Valorization of Tree Bark-Derived Suberin in Applications for the Bio-Based Composites Industry–A Recent Review

Journal of Renewable Materials 2024年第6期12卷 1029-1042页

作者： Aleksandra Jeżo Institute of Wood Sciences and Furniture SGGWNowoursynowska St.159Warsaw02-776Poland

Bark extracts are sustainable sources of biopolymers and hold great promise for replacing fossil fuel-based polymers,for example,in wood-based *** addition to primary and secondary metabolites,tree bark also contains suberin,which plays a major role in protecting the tree from environmental *** is a natural aliphatic-aromatic cross-linked polyester present in the cell walls of both normal and damaged external tissues,the main component of which are long-chain aliphatic *** main role as a plant ingredient is to protect against microbiological factors and water *** of the most important suberin monomers are suberin fatty acids,known for their hydrophobic and barrier ***,due to the diverse chemical composition of suberin,it is an attractive alternative to hydrocarbon-based *** its potential is recognized,it is not widely used in biocomposites technology,including wood-based composites and the polymer *** article will discuss the current knowledge about the potential of suberin and its components in biocomposites technology,which will include surface finishes,composite adhesives and polymer blends.

关键词： Suberin suberinic acids wood composites biocomposites biopolyester

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PRODUCTION AND CHARACTERIZATION OF POLY(3-HYDROXYBUTYRATE-co-3-HYDROXYHEXANOATE)-POLY(ETHYLENE GLYCOL) HYBIRD COPOLYMER WITH ADJUSTABLE MOLECULAR WEIGHT

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Chinese Journal of Polymer Science 2012年第1期30卷 101-111页

作者： Ya—li Zhang Xiao-yun Lu Qian-qian Liu Ming-chuan Li Zhi-qian Yang Jian-gang Ma Department of Biological Science and Bioengineering Key Laboratory of Biomedicai Information Engineering of Ministry of Education School of Life Science and Technology Xi ＇an Jiaotong University Xi ＇an 710049 China

A novel natural-synthetic hybrid block copolymer was synthesized by Aeromonas hydrophila 4AK4 in poly（ethylene glycol）（PEG,M_n=200） modified *** hybrid biomaterial consists of the natural hydrophobic polymer poly（3-hydroxybutyrat-co-3-hydroxyhexanoate）（PHBHHx） end-capped with hydrophilic PEG,which has the increased flexibility as well as the improved thermal *** of diethylene glycol（DEG） and ethylene glycol could not result in the accumulation of hybrid block *** and ethylene glycol,together with PEG-200,could cause a reduction of molar mass of PHBHHx,resulting in a series of low molecular weight polymer and the reduction of the polymer yield as well as the cellular *** vitro degradation of PHBHHx and PHBHHx-PEG with different molecular weight showed that the decrease of molecular weight accelerated the degradation of copolymers,but PEG modification has little effect on its degradation *** results in this study provided a convenient and direct method to produce a series of PHBHHx and PHBHHx-PEG materials with adjustable molecular weight and broad molecular weight distribution which will be very useful for the biomedical applications.

关键词： biopolyester Biodegradable Molecular weight Polyhydroxyalkanoates Polyethylene glycol

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Crystallization Kinetics of Poly(3-hydroxybutyrate) Granules in Different Environmental Conditions

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Journal of Biomaterials and Nanobiotechnology 2011年第3期2卷 301-310页

作者： Michael Porter Jian Yu 不详

Poly(3-hydroxybutyrate) (PHB) is a natural biopolyester accumulated in microbial cells as tiny amorphous granules. The nano- micro-particles have a variety of potential applications and behave differently in different environments. In this work, the in situ crystallization of native PHB granules was investigated under different environmental conditions. The isothermal crystallization kinetics of the granules was shown to follow Avrami’s equation. The model parameter describing crystal growth is a function of temperature or pH and estimated from in situ crystallization measurements with attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. Empirical equations describing crystal growth are derived for the parameter values. PHB granules heated at 80-140°C in acidic solution (pH 2) up to 4 hr showed an increase in crystallinity from about 5% to 35% and moderate particle aggregation. PHB granules suspended in alkaline solutions (pH 9-12) at room temperature up to 4 hr showed an increase in crystallinity up to 45% and very little particle aggregation. It was found that the amorphousness of PHB granules in vivo is stabilized by water, lipids and proteins. Upon removal of these impurities, partial crystallization is induced which may inhibit extensive particle aggregation.

关键词： Avrami model crystallization kinetics PHA PHB granules biopolyester particles

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