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Enhanced thermal conductivity and electrothermal conversion of epoxy composites through silane-dopamine modified graphite films 通过硅烷-多巴胺改性石墨薄膜提高环氧树脂复合材料的导热性和电热转化率
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56186
Wen Li, Lingcheng Kong, Wei Zhang, Dong Zhao, Wenbo Xin

A novel surface modification technique for graphite films (GF) to improve the interface thermal resistance with epoxy resin was presented. By utilizing the self-polymerization of dopamine (PDA), dopamine micro and nanoparticles were formed on the surface of the GF. Subsequently, the surface of the epoxy resin was functionalized with polydopamine (PDA) through grafting of the silane coupling agent 3-glycidyl ether oxy-propyl trimethoxy silane (GOPTS), enabling the introduction of epoxy resin groups onto the surface of the GF. Employing a simple folding technique, a three-dimensional GF network (3DGF) was constructed, in which modified GF was successfully incorporated into the polymer matrix. The results showed that the 3DGF network further promoted the effective transfer of heat and electrons within the composite, leading to a significant improvement in thermal and electrothermal conversion performance. The prepared 3DGPGF/epoxy resin composite exhibits high thermal conductivity (7.14 W/mK) at a relatively low GF loading (31.9 wt%). Under a voltage of 12 V, the surface temperature of the sample rapidly rises from room temperature to 130°C within 200 s, and can completely melt ice cubes within 60 s. These results indicate that epoxy-silane-dopamine-modified graphite film can be a promising candidate material, and this work provides a promising strategy for designing and manufacturing high-performance composites with improved thermal properties. The developed method has the potential to be extended to other polymer matrices and fillers, and the prepared composites have enormous potential in various applications.

该研究提出了一种新型石墨薄膜(GF)表面改性技术,以改善其与环氧树脂的界面热阻。通过利用多巴胺(PDA)的自聚合作用,在石墨膜表面形成了多巴胺微颗粒和纳米颗粒。随后,通过接枝硅烷偶联剂 3-缩水甘油醚氧丙基三甲氧基硅烷(GOPTS),环氧树脂表面被多巴胺(PDA)功能化,从而在 GF 表面引入环氧树脂基团。利用简单的折叠技术构建了三维 GF 网络(3DGF),并成功地将改性 GF 融入聚合物基体中。结果表明,三维 GF 网络进一步促进了复合材料内部热量和电子的有效传递,从而显著提高了热转换和电热转换性能。制备的 3DGPGF/epoxy 树脂复合材料在相对较低的 GF 负载(31.9 wt%)下表现出较高的热导率(7.14 W/mK)。这些结果表明,环氧-硅烷-多巴胺改性石墨薄膜是一种很有前途的候选材料,这项工作为设计和制造具有更好热性能的高性能复合材料提供了一种很有前途的策略。所开发的方法有可能扩展到其他聚合物基材和填料,所制备的复合材料在各种应用中具有巨大的潜力。
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引用次数: 0
Free-radical emulsion copolymerization of styrene/1-hexene in an autoclave: Synthesis and property evaluation 苯乙烯/己烯在高压釜中的自由基乳液共聚:合成与性能评估
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56194
Sanjay Remanan, Mamdouh Ahmed Al-Harthi

A copolymer based on styrene and 1-hexene was synthesized using free-radical emulsion polymerization. Reaction pressure has a significant influence on copolymer formation. There was a phase separation when styrene was copolymerized with 1-hexene at lower pressure (1 bar) and a stable emulsion was observed under a pressurized reaction (4.5 bar). Additionally, a phase separation was also observed at a lower reaction pH (7.2) and was evidenced by the reduced pH value at the end of the copolymerization. H1 nuclear magnetic resonance (NMR) spectroscopy analysis showed the disappearance of methylene proton peak intensities in both styrene and 1-hexene after the copolymerization reaction indicating the increased conversion of monomers in emulsion. Synthesized copolymer was also studied using the C13 NMR analysis. It was further analyzed by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The emulsion was destabilized by the synergistic action of acid and temperature to recover solid polymer. The applicability of the copolymer as a polymer modifier was studied by blending with commercial PS. Copolymer thermal properties were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Other properties such as emulsion particle size, droplet morphology, and the effect of pH were also investigated in this study.

利用自由基乳液聚合法合成了一种基于苯乙烯和 1-己烯的共聚物。反应压力对共聚物的形成有重要影响。苯乙烯与 1- 己烯在较低压力(1 巴)下共聚时会发生相分离,而在加压反应(4.5 巴)下则可观察到稳定的乳液。此外,在较低的反应 pH 值(7.2)下也观察到了相分离现象,共聚结束时 pH 值的降低也证明了这一点。H1 核磁共振(NMR)光谱分析显示,共聚反应后苯乙烯和 1-己烯中的亚甲基质子峰强度消失,表明乳液中单体的转化率提高。还利用 C13 NMR 分析对合成的共聚物进行了研究。傅立叶变换红外光谱(FT-IR)和 X 射线光电子能谱(XPS)对其进行了进一步分析。乳液在酸和温度的协同作用下变得不稳定,从而回收了固体聚合物。通过与商用 PS 混合,研究了共聚物作为聚合物改性剂的适用性。通过差示扫描量热法(DSC)和热重分析法(TGA)分析了共聚物的热性能。本研究还考察了乳液粒度、液滴形态和 pH 值影响等其他特性。
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引用次数: 0
Tailored design of well-defined comb-like copolymer dispersants for enhanced dispersion and stability of cerium oxide nanoparticle suspensions 量身设计定义明确的梳状共聚物分散剂,提高纳米氧化铈悬浮液的分散性和稳定性
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56243
Jinlin Man, Xinyue Guan, Guanshao Huang, Junjie Zhou, Han Miao, Xinxin Li

The development of effective dispersants for nanoparticle suspensions is crucial for enhancing the performance and stability of various functional materials. In this study, we investigated a series of comb-like block copolymers with well-defined structures, including both categories of block copolymers and uniformly composed random copolymers, as dispersants for cerium oxide (CeO2) suspensions. Acrylic acid (AA) units were used for anchoring and electrostatic repulsion, while methoxy polyethylene glycol acrylate (MPEGA) units provided additional steric hindrance and solubility. We explored stabilization mechanisms involving polymer topologies, chain lengths, compositions, and molecular interactions from kinetic and thermodynamic perspectives. The results demonstrate significant improvements in dispersion stability with both categories of well-controlled copolymers, especially with uniformly composed random copolymers due to their uniformly distributed multi-point anchoring and balanced electrostatic and steric stabilization. This research not only enhances the fundamental understanding of polymer-nanoparticle interactions and polymer dispersants, but also provides valuable guidance for the tailored design of dispersants for specific industrial and scientific needs.

为纳米颗粒悬浮液开发有效的分散剂对于提高各种功能材料的性能和稳定性至关重要。在本研究中,我们研究了一系列具有明确结构的梳状嵌段共聚物,包括嵌段共聚物和均匀组成的无规共聚物两类,作为氧化铈(CeO2)悬浮液的分散剂。丙烯酸(AA)单元用于锚定和静电排斥,而甲氧基聚乙二醇丙烯酸酯(MPEGA)单元则提供额外的立体阻碍和溶解性。我们从动力学和热力学角度探讨了涉及聚合物拓扑结构、链长、组成和分子相互作用的稳定机制。结果表明,这两类控制良好的共聚物的分散稳定性都有明显改善,尤其是均匀组成的无规共聚物,因为它们具有均匀分布的多点锚定以及平衡的静电和立体稳定作用。这项研究不仅加深了人们对聚合物-纳米粒子相互作用和聚合物分散剂的基本了解,还为针对特定工业和科学需求量身定制分散剂的设计提供了宝贵的指导。
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引用次数: 0
On the thermal degradation of telechelic poly (lactic acid) and FLAX fiber biocomposites 聚(乳酸)和 FLAX 纤维生物复合材料的热降解研究
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56217
Ananda K. C. Albuquerque, Pedro H. M. Nicácio, Laura Boskamp, Katharina Arnaut, Katharina Koschek, Renate Maria Ramos Wellen

Renewable resources based polymers have been the focus of materials science scientists since they help to protect the environment in addition to reducing the petroleum resources use. Among renewable polymers poly (lactic acid) (PLA) has emerged due to its biodegradable character and proper performance similar to engineering resins, which afford wide field of applications. In this work the thermal degradation of esterified PLA with itaconic acid (PLA ITA) and the biocomposite PLA ITA FLAX was investigated using thermogavimetry (TG) which data were corroborated through Fourier transform infrared spectroscopy (FTIR). Isothermal TGs scans and FTIRs spectra were acquired from 150 to 600°C, collected data evidenced that FLAX improved PLA ITA thermal stability, delaying the decomposition of PLA ITA by up to 100 min at 250°C, ensuring safer processability at higher temperatures. From the deconvolution of the DTG peaks, the peak at lower temperature is suggested to be linked to itaconic anhydride decomposition which undergoes macromolecule dissociation, converting into itaconic anhydride and releasing water and afterwards being converted into citraconic anhydride, while the peak at higher temperature is associated to the thermal degradation of telechelic PLA. Degradation mechanism is proposed, evidenced by changes in the wavelength of CO group under the effect of temperature, as evidenced in TG-IR spectra.

基于可再生资源的聚合物一直是材料科学科学家关注的焦点,因为它们不仅有助于保护环境,还能减少石油资源的使用。在可再生聚合物中,聚乳酸(PLA)因其可生物降解的特性和类似工程树脂的适当性能而崭露头角,应用领域十分广泛。在这项研究中,使用热重仪(TG)研究了衣康酸酯化聚乳酸(PLA ITA)和生物复合材料 PLA ITA FLAX 的热降解,并通过傅立叶变换红外光谱(FTIR)对数据进行了证实。从 150 到 600°C 的等温 TG 扫描和傅立叶变换红外光谱采集的数据表明,FLAX 提高了聚乳酸 ITA 的热稳定性,在 250°C 下可将聚乳酸 ITA 的分解时间延迟 100 分钟,从而确保了在更高温度下的加工安全性。从 DTG 峰的解卷积来看,较低温度下的峰与衣康酸酐分解有关,衣康酸酐分解时会发生大分子解离,转化为衣康酸酐并释放出水,然后转化为柠檬康酸酐;而较高温度下的峰与远志聚乳酸的热降解有关。根据 TG-IR 光谱显示的 CO 基团波长在温度作用下的变化,提出了降解机制。
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引用次数: 0
Synergistic effects of dune sand-based silica and alkali-treated date palm fiber as efficient fillers for improving the properties of hybrid epoxy composites 沙丘砂基二氧化硅和碱处理枣椰纤维作为高效填料在改善混合环氧树脂复合材料性能方面的协同效应
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56238
Samira Maou, Yazid Meftah, Yves Grohens, Antoine Kervoelen, Anthony Magueresse, Wassila Selmani, Fatima Ferhad

Lignocellulosic fiber-reinforced composites exhibit enhanced physical properties and eco-friendliness, which has resulted in extended application of these biocomposite materials in important engineering sectors. In this study, we investigated the synergistic impacts of dune sand (DS)-based silica (SiO2) and alkali-treated date palm fiber (ADPF) fillers on the thermophysical and viscoelastic characteristics of epoxy (EP) hybrid composites. A hand layup procedure was employed to produce EP hybrid composites reinforced with 20 wt.% ADPF as well as 5, 7, and 10 wt.% DS. Compared to the other composite samples, the EP matrix reinforced with 20 wt.% ADPF and 10 wt.% DS (HC5) exhibited better thermal (Tmax = 380°C, Tg = 63.13°C) and dynamic mechanical properties (storage modulus = 2700 MPa). Additionally, Cole–Cole plots revealed the excellent interaction between ADPF, DS, and epoxy matrix. Scanning electron microscopy (SEM) measurements further confirmed that the development of an effective interface between DS particles, ADPF fiber, and epoxy matrix caused a decrease in water absorption (1.5%). The best wetting conditions with the lowest thickness swelling (2.8%) were obtained by increasing the DS content up to 10 wt.%. Based on these findings, it can be concluded that, owing to their superior dynamic mechanical characteristics, hybrid composites containing 10 wt.% DS may be employed in important aircraft and aeronautic applications.

木质纤维素纤维增强复合材料具有更强的物理性能和生态友好性,因此这些生物复合材料在重要的工程领域得到了广泛应用。在本研究中,我们研究了沙丘砂(DS)基二氧化硅(SiO2)和碱处理枣椰纤维(ADPF)填料对环氧树脂(EP)混合复合材料的热物理特性和粘弹性特性的协同影响。采用手糊工艺生产了用 20 wt.% ADPF 以及 5、7 和 10 wt.% DS 增强的 EP 混合复合材料。与其他复合材料样品相比,使用 20 重量百分比 ADPF 和 10 重量百分比 DS(HC5)增强的 EP 基体具有更好的热性能(Tmax = 380°C,Tg = 63.13°C)和动态机械性能(存储模量 = 2700 兆帕)。此外,科尔-科尔图显示了 ADPF、DS 和环氧基质之间良好的相互作用。扫描电子显微镜(SEM)测量进一步证实,DS 颗粒、ADPF 纤维和环氧基质之间形成的有效界面降低了吸水率(1.5%)。将 DS 的含量提高到 10 wt.%,可获得最佳的润湿条件和最低的厚度膨胀率(2.8%)。基于这些研究结果,我们可以得出结论:由于具有优异的动态机械特性,含有 10 wt.% DS 的混合复合材料可应用于重要的飞机和航空领域。
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引用次数: 0
Study on mechanical and thermal properties of coir fibers reinforced thermoplastic starch/poly(butylene adipate-co-terephthalate) composites 椰子纤维增强热塑性淀粉/聚(己二酸丁二醇酯-对苯二甲酸酯)复合材料的机械性能和热性能研究
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56206
Xianggang Tang, Jianwei Tan, Yongxiang Hu, Chengzhuang Su, Zhekun Liu, Chuncheng Wei, Shuhua Dong, Fantao Meng

In this study, a novel biodegradable coir fiber (CF) reinforced thermoplastic starch (TPS) and poly(butylene adipate-co-terephthalate) (PBAT) composites (CF/TPS/PBAT) with a constant TPS: PBAT weight ratio of 70:30 and 5, 10, 15, and 20 wt% additions of CF were prepared by the melt blending and injection molding. The effects of fiber content and fiber surface modification on the mechanical and thermal properties of the prepared biocomposites were investigated. The incorporation of fibers effectively enhanced the mechanical and thermal properties of TPS/PBAT blends. Due to the removal of hemicellulose and impurities on the fiber surface after alkali treatment, the interfacial adhesion of the fiber was enhanced, thus improving the compatibility between the fibers and the matrix. At 20 wt% CFs with alkali treatment, the tensile strength exhibited 393% improvement and flexural strength exhibited 536% improvement over TPS/PBAT blends. Thermal analysis showed that the thermal stability, storage modulus, and glass transition temperature of the composites increased with the increase of fiber content. This work is significant for the development of biodegradable materials.

本研究通过熔融混合和注射成型制备了一种新型可生物降解的棕纤维(CF)增强热塑性淀粉(TPS)和聚己二酸丁二醇酯(PBAT)复合材料(CF/TPS/PBAT),TPS 与 PBAT 的重量比为 70:30,CF 的添加量分别为 5、10、15 和 20 wt%。研究了纤维含量和纤维表面改性对所制备生物复合材料机械性能和热性能的影响。纤维的加入有效提高了 TPS/PBAT 共混物的力学性能和热性能。由于碱处理后纤维表面的半纤维素和杂质被去除,增强了纤维的界面粘附性,从而提高了纤维与基体的相容性。与 TPS/PBAT 混合物相比,碱处理后 20 wt% 的 CFs 拉伸强度提高了 393%,弯曲强度提高了 536%。热分析表明,复合材料的热稳定性、储存模量和玻璃化转变温度随着纤维含量的增加而提高。这项工作对生物可降解材料的开发具有重要意义。
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引用次数: 0
Colon-adhesive poly(maleic anhydride)-sirolimus conjugate alleviates local colitis inflammation 结肠黏附性聚(马来酸酐)-西罗莫司共轭物可缓解局部结肠炎炎症
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56220
Sang-Hun Choi, Soo-Hyang Chi, Yu-Seong Park, Sejin Son, Young-Eun Cho, Jihoon Kim

Ulcerative colitis (UC) is a chronic, recurring inflammatory condition triggered by immunological imbalances in the digestive tract, leading to weight loss, diarrhea, rectal bleeding, and an increased risk of colon cancer. Existing UC treatments encounter significant limitations, such as primary non-responsiveness, secondary loss of efficacy, and adverse effects. This necessitates the development of drugs and drug formulations to broaden UC treatment options. This study describes the extended retention of poly(maleic anhydride)-drug conjugates in the large intestine of a DSS-induced acute colitis mouse model and highlights their potential for treating UC. Anti-inflammatory sirolimus (Siro) is considered an alternative drug for UC treatment, which however also has side effects due to nonspecific systemic delivery. Accordingly, poly(malic anhydride)-sirolimus (pSiro) is synthesized by linking Siro, a representative immunosuppressant and anti-inflammatory drug used in clinical practice, to anhydride groups of poly(maleic anhydride) via ester bonds. In a biodistribution study, poly(maleic anhydride) increases drug retention in the large intestine. Histochemical staining reveals the reduced inflammation degree in the treatment of pSiro, which leads to the decline of systemic inflammatory markers such as plasma TNF-α, NO, and LPS levels. These results suggest pSiro as a potential therapeutic option for the treatment of UC.

溃疡性结肠炎(UC)是一种慢性、反复发作的炎症,由消化道免疫失衡引发,导致体重减轻、腹泻、直肠出血和结肠癌风险增加。现有的 UC 治疗方法存在很大的局限性,如原发性无应答、继发性疗效丧失和不良反应。因此,有必要开发药物和药物制剂,以扩大 UC 治疗的选择范围。本研究描述了聚(马来酸酐)-药物共轭物在DSS诱导的急性结肠炎小鼠模型的大肠中的延长保留时间,并强调了其治疗UC的潜力。抗炎药西罗莫司(Siro)被认为是治疗慢性结肠炎的替代药物,但它也会因非特异性全身给药而产生副作用。因此,聚(马来酸酐)-西罗莫司(pSiro)通过酯键与聚(马来酸酐)的酸酐基团连接合成,西罗是临床上使用的一种代表性免疫抑制剂和抗炎药物。在一项生物分布研究中,聚马来酸酐增加了药物在大肠中的滞留。组织化学染色显示,使用 pSiro 治疗后炎症程度降低,从而导致全身炎症指标(如血浆 TNF-α、NO 和 LPS 水平)下降。这些结果表明 pSiro 是治疗 UC 的一种潜在疗法。
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引用次数: 0
Effect of different alkoxy POSSs on thermal stability and mechanical properties of silicone rubber 不同烷氧基 POSS 对硅橡胶热稳定性和机械性能的影响
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56104
Song Yang, Xiaoyu Chen, Peng Xu, Jianjun Shi, Qi Yao, Junning Li, Ziping Zhou, Guangxin Chen, Qifang Li, Zheng Zhou

Six varieties of alkoxy polyhedral oligomeric silsesquioxanes (POSSs) featuring methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, and n-hexoxy as terminal groups were synthesized using the direct dehydrogenation condensation method. These POSSs were then incorporated as cross-linking agents into hydroxy-terminated polydimethylsiloxane (HPDMS) to create various formulations of room temperature vulcanized silicone rubbers (RTV SRs), denoted as SRM, SRE, SRP, SRI, SRB, and SRH. The morphology, thermal stability, and mechanical properties of the resulting SRs are analyzed using scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and universal tensile testing machine. The findings indicate that the incorporation of POSS into SRs results in significant enhancements in thermal stability and mechanical properties when compared to the control group (TEOS/SR). SRB and SRH exhibit the highest cross-linking density and tensile strength. Specifically, SRB-4 demonstrates the highest tensile strength at 2.66 MPa, representing an 8.6-fold increase compared to TEOS/SR. The maximum decomposition rate temperature of SRP-4 reaches 527°C and is 194°C higher than TEOS/SR. Because the alkoxy groups with different chain lengths on POSS have different chemical reactivity, they have a great effect on the dispersion of POSS in SRs, which affect the cross-linking density, tensile strength, and thermal stability.

采用直接脱氢缩合法合成了六种以甲氧基、乙氧基、正丙氧基、异丙氧基、正丁氧基和正己氧基为端基的烷氧基多面体低聚硅倍半氧烷(POSS)。然后将这些 POSS 作为交联剂加入羟基封端聚二甲基硅氧烷(HPDMS)中,制成各种室温硫化硅橡胶(RTV SR)配方,分别称为 SRM、SRE、SRP、SRI、SRB 和 SRH。使用扫描电子显微镜(SEM)、热重分析(TGA)和通用拉伸试验机分析了所制得的 SR 的形态、热稳定性和机械性能。研究结果表明,与对照组(TEOS/SR)相比,在 SR 中加入 POSS 可显著提高热稳定性和机械性能。SRB 和 SRH 的交联密度和拉伸强度最高。具体来说,SRB-4 的拉伸强度最高,为 2.66 兆帕,与 TEOS/SR 相比提高了 8.6 倍。SRP-4 的最大分解率温度达到 527°C,比 TEOS/SR 高出 194°C。由于 POSS 上不同链长的烷氧基具有不同的化学反应活性,它们对 POSS 在 SR 中的分散性有很大影响,从而影响交联密度、拉伸强度和热稳定性。
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引用次数: 0
Stable and biocompatible multivalent polymer-grafted gold nanorods for enhanced photothermal antibacterial therapy 用于增强光热抗菌疗法的稳定且生物兼容的多价聚合物接枝金纳米棒
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56230
Lin Mei, Zhimin Liu, Yanmei Shi, Xiangyun Zhang

Near-infrared laser-activated gold nanorods (AuNRs) with excellent photothermal property and tunable surface functionalization are considered as an ideal platform for biomedical applications. However, bare AuNRs have cytotoxicity against normal cells and are prone to agglomeration during laser irradiation. Herein, multivalent polymer-functionalized AuNRs (AuNRs@pDMAEMA-C4) was constructed as a highly stable and biocompatible photothermal agent for enhanced antibacterial therapy. The functionalized polymer was synthetized via the reversible addition-fragmentation chain transfer polymerization and subsequently quaternized. Moreover, positively charged AuNRs@pDMAEMA-C4 can easily capture the bacterial surface via electrostatic interactions. The integration of photothermal therapy of AuNRs and chemotherapy of functionalized polymer can achieve enhanced antibacterial effects. Under 808 nm laser irradiation, AuNRs@pDMAEMA-C4 possessed excellent photothermal conversion capability and can kill gram-positive and gram-negative bacteria. Study of the antibacterial mechanism indicated that the antibacterial action of the prepared photothermal antibacterial agent can cause serious damage of the bacterial outer membranes, result in cytoplasm leakage and bacterial death. The nanocomposites combining with near-infrared laser irradiation can facilitate rapid healing of bacteria-infected wound by rat model of wound infection and histological analysis of the wound tissues. These results suggest that the surface functionalization can be used as potential strategy to fabricate light-activated therapeutic agent for biomedical applications.

近红外激光激活的金纳米棒(AuNRs)具有优异的光热特性和可调的表面功能化,被认为是生物医学应用的理想平台。然而,裸露的 AuNRs 对正常细胞具有细胞毒性,并且在激光照射过程中容易聚集。在此,我们构建了多价聚合物功能化 AuNRs(AuNRs@pDMAEMA-C4),作为一种高稳定性和生物相容性的光热剂,用于增强抗菌治疗。这种功能化聚合物是通过可逆加成-断裂链转移聚合法合成的,随后被季铵化。此外,带正电荷的 AuNRs@pDMAEMA-C4 可通过静电相互作用轻松捕获细菌表面。AuNRs 的光热疗法与功能化聚合物的化疗相结合,可以增强抗菌效果。在 808 nm 激光照射下,AuNRs@pDMAEMA-C4 具有优异的光热转换能力,可杀死革兰氏阳性和阴性细菌。抗菌机理研究表明,所制备的光热抗菌剂的抗菌作用可严重破坏细菌外膜,导致细胞质泄漏和细菌死亡。通过大鼠伤口感染模型和伤口组织学分析,纳米复合材料结合近红外激光照射可促进细菌感染伤口的快速愈合。这些结果表明,表面功能化可作为一种潜在的策略,用于制造生物医学应用中的光激活治疗剂。
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引用次数: 0
Synthesis, characterization, and performance evaluation of a high-efficiency fully biobased biodegradable plasticizer 高效全生物基可生物降解增塑剂的合成、表征和性能评估
IF 2.7 3区 化学 Q2 POLYMER SCIENCE Pub Date : 2024-09-04 DOI: 10.1002/app.56225
Boyou Hou, Yinan Sun, Yanlin Guo, Wei Zhang, Xueying Shan, Qianqian Cui, Zhendong Chen, Qingting Ni, Jinchun Li

Developing bio-based plasticizers not only aids in the reduction of fossil fuel consumption but also presents a lower risk to human health. In this study, a fully biodegradable plasticizer—levulinate malate ethanol lactates (LMEL) was successfully synthesized from L-lactic acid, DL-malic acid, levulinic acid, and ethanol, and was compared with commercially plasticizers (acetyl tributyl citrate (ATBC), dioctyl phthalate (DOP) and di-2-ethylhexyl terephthalate (DOTP)). 40 phr LMEL plasticized polyvinyl chloride (PVC) (40LMEL) yielded a remarkable elongation at break of 526.9%, compared with the pure PVC resin (4.5%), thereby significantly enhancing the flexibility of PVC. Moreover, the optical transparency of 40LMEL samples was found to be equivalent to PVC plasticized with three commercial plasticizers. Most importantly, compared with three commercial plasticizers, 40LMEL exhibited superior resistance to migration and volatility, with mass losses of 1.055% in H2O, 13.601% in n-hexane, 14.636% in ethanol, and 1.496% in activated carbon, respectively. Soil degradation experiments have demonstrated that LMEL can be broken down by microorganisms in the soil into nontoxic aliphatic compounds (e.g., 4-oxo-pentanoic acid, and 4,5,7-trihydroxy 2-octenoic acid, et al.). Collectively, LMEL exhibited better overall performance than three commercial plasticizers. This work provides new options for the design of efficient fully bio-based plasticizers.

开发生物基增塑剂不仅有助于减少化石燃料的消耗,还能降低对人类健康的风险。本研究成功地从 L-乳酸、DL-苹果酸、乙酰丙酸和乙醇中合成了一种完全可生物降解的增塑剂--乙酰丙酸乙醇乳酸盐(LMEL),并与市售增塑剂(柠檬酸乙酰三丁酯(ATBC)、邻苯二甲酸二辛酯(DOP)和对苯二甲酸二-2-乙基己酯(DOTP))进行了比较。与纯 PVC 树脂(4.5%)相比,40 phr LMEL 塑化聚氯乙烯(PVC)(40LMEL)的断裂伸长率高达 526.9%,从而显著提高了 PVC 的柔韧性。此外,还发现 40LMEL 样品的光学透明度与使用三种商用增塑剂增塑的聚氯乙烯相当。最重要的是,与三种商用增塑剂相比,40LMEL 表现出优异的抗迁移性和抗挥发性,在 H2O 中的质量损失为 1.055%,在正己烷中为 13.601%,在乙醇中为 14.636%,在活性炭中为 1.496%。土壤降解实验表明,LMEL 可被土壤中的微生物分解为无毒的脂肪族化合物(如 4-oxo-pentanoic acid 和 4,5,7-trihydroxy 2-octenoic acid 等)。总体而言,LMEL 的综合性能优于三种商用增塑剂。这项工作为设计高效的全生物基增塑剂提供了新的选择。
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引用次数: 0
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Journal of Applied Polymer Science
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