POLYMER DEGRADATION AND STABILITY
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2025
·
IF 7.4
Zhen Zhang,Xin Hu,Geng Chen,Peijie Hou,Qi Zhang,Dahong Zhang,Chengdong Xiong,Xiliang Liu,Lifang Zhang
In this study, a series of ABA–type block copolymers, PTMC–b–PCL–b–PTMC, with varying block ratios were synthesized via sequential ring–opening polymerization. A systematic investigation was conducted to assess the mechanical properties, thermal behavior, crystallization characteristics, enzymatic degradation under lipase–rich conditions, and biological performance of the copolymers with different compositions. The results demonstrated that increasing the PTMC block content significantly influenced the physicochemical properties of the copolymers. Specifically, a higher proportion of PTMC blocks resulted in decreased crystallinity and enhanced toughness. Furthermore, lipase degradation studies revealed that during the early stages, all polymer compositions exhibited the characteristic surface erosion behavior of polyesters. However, in the later stages, PCL–OH exhibited more pronounced collapse degradation, whereas the block copolymers PTCT6040 and PTCT7030, with higher crystallinity, maintained surface erosion–dominated degradation while preserving their macroscopic structure and mechanical stability. Additionally, biocompatibility assays confirmed the non–cytotoxicity of these materials, highlighting their potential for applications in tissue engineering.
研究领域:
高分子科学
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材料科学
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生物医学工程
·
可降解材料
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DOI
高影响因子
PLANTA
·
2022
·Vol. 255
·期 4
·1-13
·
IF 4.54
Han Xueyuan,Wang Xiaoyu,Shen Chi,Mo Yiwei,Tian Rungang,Mao Linchun,Luo Zisheng,Yang Huanyi
Main conclusion
Exogenous ABA played a positive role in the accumulation and biosynthesis of aroma components of postharvest kiwifruit after low-temperature storage, especially the esters production during ripening.
Abstract Low-temperature storage (LTS) generally affects the aroma formation associated with the decrease in aroma quality in kiwifruit. In this work, abscisic acid (ABA) treatment after LTS increased the production of aroma components in postharvest kiwifruit and enhanced the related enzyme activity, especially alcohol acyltransferase (AAT), branched amino acid transaminase (BCAT) and hydroperoxide lyase (HPL). Corresponding to the enzyme activity, the gene expression of AchnAAT , AchnADH , AchnBCAT and AchnHPL was significantly up-regulated by ABA. The principal component analysis further illustrated the differences in aroma components between ABA and the control. The positive correlation of aroma accumulation with the expression levels of AchnPDC and AchnLOX and the enzyme activities of BCAT and pyruvate decarboxylase (PDC) was also revealed by correlation analysis. In addition, the promoter sequences of the key genes involved in aroma biosynthesis contained multiple cis-elements (ABRE and G-box) of ABA-responsive proteins. Combining the transcriptome sequencing data, the promoting role of ABA signaling in the regulation of aroma biosynthesis of postharvest kiwifruit after LTS was discussed. This study would provide a reference for improving aroma quality of postharvest kiwifruit after LTS, as well the molecular mechanism of kiwifruit aroma fading after LTS.
研究领域:
植物生理学
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采后生物学
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分子生物学
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生物化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 4.6
Zhu Heng-Hui,Wang Jin-Yu,Deng Nan-Kai,Huang Jia-Xiang,Hou Ya-Nan,Wang Meng,Liu Zhi-Yang,Huang Shuai
Liquid crystal elastomers (LCEs) are compelling smart materials for soft robotics and flexible electronics. However, both conventional and dynamically crosslinked LCE systems fundamentally rely on chemically crosslinked networks, which has long been regarded as a prerequisite for their reversible actuation. While thermoplastic elastomers based on block copolymers offer a structural model for constructing robust physically crosslinked networks, it remains a significant challenge to transplant this design strategy into LCEs to realize reversible actuation in non-co-valently crosslinked system. Herein, we develop a physically crosslinked thermoplastic LCE system based on ABA-type triblock copolymers (PS- b -MCLCP- b -PS). Polystyrene (PS) hard-block aggregates act as reversible physical crosslinking sites, effectively replacing permanent covalent bonds. We systematically investigated the regulatory effect of the PS block content on the microstructure, mechanical properties, and thermally responsive actuation of the materials. By achieving an optimal balance between physical network confinement and the segment mobility of the liquid crystal phase, the resultant elastomer exhibits excellent reversible thermally driven actuation, well-balanced mechanical properties and solvent recyclability with high mechanical retention. Furthermore, the material demonstrates prominent wide-temperature-range damping performance attributed to the synergistic energy dissipation of the physical network and mesogen rotation. This work offers a feasible molecular design strategy for sustainable and multifunctional LCEs to break the dependence on chemical crosslinking for reversible actuation.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1495-1504
·
IF 4.1
Wu Shi-Long,Yang Huan-Huan,Chen Quan
In this study, we synthesized a series of ABA-type vitrimers by crosslinking the short A moieties of precursors with a bifunctional crosslinker and evaporating the small molecular byproduct. The vitrimer samples thus prepared exhibit linear viscoelasticity dependent on the length of A moiety as well as the content of the crosslinks. When the average number of A monomers per end moiety m =1.1, the crosslinker can only extend the chain but not crosslink the chain. When m becomes 2.8 or higher, introducing a crosslinker first leads to the gelation, whereas excess in crosslinker molecules leads opening of the crosslinking sites and accordingly reentry into the sol regime. Surprisingly, a further increase in the length of the A moieties increases the relaxation time much weaker than the exponential increase seen for the physically crosslinked ABA-type ionomers. We attribute this difference to the distinct relaxation mechanisms: the relaxation of the vitrimer samples is based on relatively independent exchange reactions, which contrasts with the ABA-type ionomers that relax through the collective hopping of connected ionic groups from one ion aggregate to another.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Journal of Proteomics
·
2017
·
IF 3.914
Xueyuan Han,Wenjing Lu,Xiaopeng Wei,Li Li,Linchun Mao,Yuying Zhao
Quick suberin-based healing after wounding played a protective role for plant to prevent further damage. In this study, the stimulative effect of exogenous abscisic acid (ABA) on wound suberization in postharvest kiwifruit was evaluated through suberin staining with toluidine blue O as well as the determination of suberin phenolics and aliphatics in wound tissue. Furthermore, to reveal the regulatory involvement of ABA in wound suberization, comparative quantitative proteomics and transcriptomics analyses based on iTRAQ and qRT-PCR technique were performed. In proteomics levels, a total of 95 protein species consistently showed differential abundance between ABA and control, including 29 down-regulated and 66 up-regulated protein species. The Kyoto Encyclopedia of Genes and Genomes (KEGG) with protein-protein interaction analyses revealed that ABA mainly affected the antioxidant system, phenylpropanoid metabolism and lipid metabolism associated with wound suberization. Based on the data of proteomics analysis, the differential expressions of genes encoding 11 selected protein species were confirmed by qRT-PCR analyses. GSH-Px, MDHAR, SOD , APX , POD, PAL , CCR, PPO , CYP86B1, DGGT and KCS11 were likely to be the key enzymes that involved the response of ABA to stimulate wound suberization by mediating the antioxidant system, phenylpropanoid metabolism and lipid metabolism. Biological significance Kiwifruit is susceptible to physical injury causing postharvest deterioration during harvest, transportation and storage. Therefore, quick healing is important for maintaining the postharvest quality of injured fruit. This work elucidated the potential role of ABA and the proteomic mechanism of its regulation in wound suberization of postharvest kiwifruit.
研究领域:
植物生理学
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蛋白质组学
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分子生物学
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DOI
PubMed
高影响因子
iScience
·
2023
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IF 5.8
Yuanyuan Zhang,Jie Zheng,Shiraku Margaret Linyerera,Richard Odongo Magwanga,Yuqing Hou,Yuhong Wang,Yanchao Xu,Aziz Khan,Shuxun Yu,Zhongli Zhou,Fang Liu,Xiaoyan Cai
Summary The 5′-deoxyadenosine deaminase (DADD), a member of the amidohydrolase family regulates biological purine metabolism. In this study, bioinformatic analysis, overexpression and knockdown of GhdadD gene were detected to identify its potential role in drought and salt stress tolerance. The results revealed that GhdadD was induced by ABA, Auxin, MBS and light responsive elements. In transgenic Arabidopsis, seed germination rate and root length were increased under drought or salt stress. GhdadD overexpressed seedlings resulted in higher plant height, less leaf damage and lower ion permeability. The expression of osmotic stress and ABA-responsive genes were up regulated. While in GhdadD -silenced cotton seedlings, CAT, SOD activity and soluble sugar content were reduced, MDA content was increased, and the stoma opening was depressed under drought or salt stress. Some osmics stress marker genes were also up regulated. These data indicating that GhdadD enhanced plant resistance to drought and salt stress through ABA pathways.
研究领域:
植物科学
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分子生物学
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胁迫生理学
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DOI
PubMed
高影响因子
MACROMOLECULES
·
2018
·
IF 5.914
Zhujun Huang,Teng Qiu,Huangbing Xu,Haotian Shi,Jianling Rui,Xiaoyu Li,Longhai Guo
Surfactant-free visible-light-controlled emulsion polymerizations are demonstrated here to synthesize ABA-type amphiphilic triblock copolymers, where A represents the hydrophilic block of poly(acrylic acid) (PAA) and B represents the hydrophobic block, such as poly(butyl acrylate) (PBA), poly(ethyl acrylate) (PEA), poly(trifluoroethyl acrylate) (PTFEA), and poly(hexafluorobutyl acrylate) (PHFBA). The photoiniferter solution polymerization of acrylic acid (AA) in 1,4-dioxane was first performed under air atmosphere and successfully controlled by visible light with the existence of iniferter agent and ascorbic acid. Using the as-synthesized PAA with trithioester end-groups as macro-iniferter agent, ABA-type triblock copolymers were synthesized in an aqueous emulsion system. Chain growth of various hydrophobic B blocks induced self-assembly and micellization. The micelles were in turn swelled by monomers and acted as main reaction loci for the further photoiniferter emulsion polymerizations. All the polymerizations showed typical characteristics of controlled/living radical polymerization (CLRP) and an obvious “on and off” feature controlled by visible light. Compared with solution polymerizations, emulsion polymerizations exhibited higher polymerization rate and monomer conversion, and an ability to directly produce colloidal polymer microparticles.
研究领域:
高分子化学
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材料科学
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光响应材料
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胶体与界面科学
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可控自由基聚合
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DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yi Qin,Shudong Zhang,Shuai Han,Tingting Xu,Cui Liu,Min Xi,Xinling Yu,Nian Li,Zhenyang Wang
Cycloaliphatic epoxy (CE) resin plays a vital role in insulation equipment due to its excellent insulation and processability. However, the insufficient ability of CE to confine electrons under high voltage often leads to an electric breakdown, which limits its wide applications in high-voltage insulation equipment. In this work, the interface effect of inorganic nano-SiO2 introduces deep traps to capture electrons, which is synergistic with the inherent ability of the voltage stabilizer m-aminobenzoic acid (m-ABA) to capture high-energy electrons through collision. Therefore, the insulation failure rate is reduced owing to doping of the functionalized nanoparticles of the m-ABA-grafted nano-SiO2 (m-ABA-SiO2) into the CE. It is worth noting that the breakdown field strength of this m-ABA-SiO2/CE reaches 53 kV/mm, which is 40.8% higher than that of pure CE. In addition, the tensile strength and volume resistivity of m-ABA-SiO2/CE are increased by 29.1 and 140%, respectively. Meanwhile, the glass transition temperature was increased by about 25 °C and reached 213 °C. This work proves that the comprehensive performance of CE-based nanocomposites is effectively improved by m-ABA-SiO2 nanoparticles, showing great application potential in high-voltage insulated power equipment.
研究领域:
材料科学
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电气工程
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DOI
PubMed
高影响因子
PLANT CELL AND ENVIRONMENT
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2026
·
IF 6.9
Huan Chen,Qinyu Deng,Lijie Yang,Mengqi Hao,Linxi Pan,Qing Gao,Ran Li,Yonggen Lou,Jing Lu
Nitrogen level significantly impacts rice resistance to the brown planthopper (BPH, Nilaparvata lugens ). Yet, the mechanisms underlying nitrogen level-mediated rice BPH resistance remain largely unclear. Here, we found that, relative to medium nitrogen (MN) and high nitrogen (HN) conditions, low nitrogen (LN) suppressed rice growth but enhanced plant resistance to BPH, as evidenced by reduced nymph biomass, decreased phloem ingestion and lower fecundity. Biochemical and transcriptome analyses revealed that compared to MN and HN plants, LN plants exhibited significantly higher basal and/or BPH-induced levels of abscisic acid (ABA) and salicylic acid (SA), cell wall components (lignin, cellulose and hemicellulose), and certain flavonoids but lower levels of phenolamides. Moreover, the relative water content (RWC) and total amino acid concentrations were significantly lower in LN plants compared with those in MN and HN plants. Impairing the signalling pathway mediated by ABA but not SA in rice abolished the basal and/or BPH-induced accumulation of defence compounds (cell wall components and certain flavonoids) in plants and plant resistance to BPH. The results demonstrate that the ABA signalling pathway, together with reduced RWC and total amino acid concentrations in plants caused by LN conditions, plays an important role in regulating the LN-mediated rice resistance to BPH.
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DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 11
·2100055
·
IF 2.527
Xiaofan Chen,Zhou Zhou,Hao Zhang,Yipeng Mao,Zhenyang Luo,Xiang Li,Ye Sha
A lignin-derived polyacrylate, namely, poly(guaiacyl acrylate) (PGA), is evaluated as an end block in linear ABA triblock copolymer-based sustainable thermoplastic elastomers. Triblock copolymers containing a rubbery poly(methyl acrylate) (PMA) midblock and glassy PGA end blocks are prepared via Cu(0)-mediated living radical polymerization or single electron transfer living radical polymerization. A suite of triblock copolymers with different block ratios and a constant end block molecular weight is prepared. Even a low-end block content (<5% mole ratio) can significantly increase the material's mechanical strength (3–7 folds) and long elongation at break. The enhanced mechanical properties are attributed to microphase separation morphologies evidenced by calorimetric and scattering analyses. These elastomers also exhibit enhanced thermal stability compared with that of their parent homopolymers.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2023
·
IF 7
Renchi Chen,Yingyin Wu,Xiaobo Wei,Zhihai Huang,Linchun Mao
Both ethylene and abscisic acid (ABA) are identified to be crucial phytohormones that positively regulate strawberry fruit ( Fragaria × ananassa Duch.) ripening. In this work, the interplay between ethylene and ABA involved in the ripening of strawberry fruit was explored. Results suggested that ethylene promoted ABA biosynthesis via repressing miR161 expression. Meanwhile, miR161 silencing (STTM161) verified that miR161 negatively regulated ABA biosynthesis via suppressing FaNCED1 expression. In addition, dual-luciferase reporter demonstrated the suppression of miR161 on the promoter of FaNCED1 . These results illuminated a potential molecular mechanism of the collaboration between ethylene and ABA in postharvest strawberry fruit through miR161.
研究领域:
植物生理学
·
园艺学
·
分子生物学
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产品关联
DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Silu Wang,Yinan Zeng,Ammara Aslam,Haofei Yang,Yu Wang,Runsha Zhai,Yangyang Hu,Jianhua Zhang
The fast sol-gel transition of ABA triblock copolymers in aqueous solution has demonstrated excellent promise for various applications. However, the occurrence of gelation behaviors often needs precise temperature control or concentration regulation. Considering the advantages of precisely spatiotemporal control and noninvasive manner, the photo-controlled gelation behaviors are desirable but still remain a significant challenge, especially for ABA triblock copolymers. Herein, we reported a facile strategy for spatiotemporal photo-modulation of reversible gelation of ABA triblock copolymers. The pH-responsive ABA triblock copolymers [poly( N,N - diethylaminoethyl methacrylate)- b -polyethylene glycol- b -poly( N,N -diethylaminoethyl methacrylate), PDEAEMA-PEG-PDEAEMA] were synthesized and used for preparing photobase generator (Malachite green carbinol base, MGOH)-containing micellar solution. Under ultraviolet irradiation, the MGOH in PDEAEMA-PEG-PDEAEMA micelles could rapidly generate OH − , resulting in deprotonation and hydrophobization of PDEAEMA chain, finally achieving micellar reconstruction and in situ gelation transition. This study demonstrated not only a photo-controlled reversible sol-gel transition of ABA triblock copolymers without the limitations associated with conventional photosensitive reagents, but also a low-cost and fast system for intelligent monitoring, early warning, and rapid shielding of ultraviolet rays. Considering the easily available agents, simple preparation process and high flexibility in tuning hydrogel properties, this strategy opens up a promising avenue to develop photo-controlled hydrogels for various applications without involving complex synthesis of photosensitive polymers.
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高影响因子
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