POLYMER TESTING
·
2020
·
IF 3.275
Minghuan Zheng,Shanshan Zhang,Yifan Chen,Qiang Wu,Qian Li,Siqun Wang
The thermoplastic vulcanizates (TPVs) of Polylactide (PLA)/Epoxidized natural rubber (ENR) were prepared by dynamic vulcanization technology. The processing torque, crosslink density , morphology of PLA/ENR blends, and PLA's molecular weight during the processing were investigated by HAAKE rheometer, swelling measurement, scanning electron microscopy (SEM), and gel permeation chromatography (GPC). It was found that the vulcanization of ENR completed at the turning point after torque peak. After the turning point, the torque and crosslink density decreased with the processing time increasing. Moreover, the morphology of PLA/ENR blends showed bi-continuous structure during the dynamic vulcanization processing, and the phase size of PLA/ENR was increased with processing time and temperature. GPC results showed PLA degradation mainly happened after torque turning point. Thermal gravimetric analysis (TGA) results indicated that some parts of PLA would graft on ENR during processing, and the higher the processing temperature, the more the PLA was grafted.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
E-POLYMERS
·
2023
·Vol. 23
·期 1
·
IF 3.7
Xuya Fu,Tao Zhang,Wenshuo Zhang,Yuye Zhong,Shuliang Fang,Guannan Wang,Ying Li,Yajun Deng,Xinghai Liu,Houbin Li
Biomass films with ultraviolet (UV)-shielding ability have attracted considerable attention. Curcumin was introduced into castor oil-based polyurethane (CCPU) as a chain extender, which was melt with polylactic acid (PLA) as a reinforcement to obtain biomass UV-shielding film. The excellent UV absorption and antioxidant qualities of curcumin contributed to the impressive UV-shielding capacity (97.6% UV radiation absorption) and antioxidant (51% free radical scavenging) of PLA/CCPU-20 film. In the scanning electron microscopic images of film fracture, the mixing of CCPU elastomer into the PLA matrix caused the blend films to exhibit significant toughening fracture characteristics compared to the pure PLA film. The excellent thermal stability, low water swelling degree, and low water solubility of PLA/CCPU blend films were maintained after CCPU was added to the PLA matrix. Therefore, the PLA/CCPU blend films can be considered as a potential packaging material because of its favorable UV-shielding properties and film stability.
Graphical abstract
Schematic for the preparation of the PLA/CCPU blend films.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 44
·e54619
·
IF 3
Fazal Maula Khan,Mingchen Sun,Zhiwei Liu,Guanlong Li,Waheed Ali Bhagat,Kai Wang,Yan Zhao
The industry desires to create robust, resilient, thermally stable, and environmentally friendly composites. In this study, we created a poly (lactic acid) (PLA) composite via a straightforward method. The Ti 3 C 2 T X was surface-coated with polydopamine (PDA) via a bioinspired approach and was then reinforced in the PLA using melt blending. The PDA layer adorned on the Ti 3 C 2 T X provided several functional groups for the MXene nanosheets and strengthened the PLA-MXene interaction by hydrogen bonding. The well-dispersed PDA@Ti 3 C 2 T X in the PLA improved mechanical, thermal, and tribological properties. For PLA/PDA@Ti 3 C 2 T X -1, the tensile strength and elongation at the break of the nano-composite were 9.03% and 25.5% higher than pure PLA, respectively. The flexural strength and modulus were increased by 49.5% over pure PLA, reaching 148.8 and 6702 MPa, respectively. The nanocomposite toughness increased by up to 53.3%. The nanocomposites had 3.8% and 49.08% lower friction coefficient and specific wear rate, respectively, than pure PLA. The addition of Ti 3 C 2 T X and PDA@Ti 3 C 2 T X increased the thermal stability of PLA at lower temperatures and promoted carbonization. PLA/PDA@Ti 3 C 2 T X -1 showed the maximum char yield of 10 wt.% at 800°C, proving the highest thermal barrier effect due to MXene exfoliation during PDA and increased PLA dispersion state.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Toxics
·
2025
·Vol. 13
·期 9
·795
·
IF 4.1
Hongjia Peng,Bolun Yu,Zuhong Lin,Haipu Li
The incomplete degradation of degradable plastics may pose potential ecological risks, as it can generate degradable microplastics (DMPs), especially when these DMPs coexist with heavy metals in soil. Taking petrochemical-based poly(butylene adipate-co-terephthalate) (PBAT) and bio-based polylactic acid (PLA) as representative DMPs, this study investigated how DMPs affect the adsorption–desorption behavior of Cu 2+ in soil and the underlying mechanisms via batch equilibrium experiments and characterization analyses. The experiments revealed that ion exchange (accounting for 33.6–34.3%), oxygen-containing functional group complexation, and electrostatic interactions were the primary adsorption driving forces, with chemical adsorption playing the main role. Compared to the soil, the PBAT and PLA had smaller specific surface areas and pore volumes, fewer oxygen-containing functional groups, and especially lacked O-metal functional groups. They can dilute soil, clog its pores, and cover its active sites. 1% DMPs significantly reduced the soil’s equilibrium adsorption capacity (Q e ) (3.7–4.7%) and increased equilibrium desorption capacity (Q De ) (1.7–2.6%), thereby increasing the mobility and ecological risk of Cu 2+ . PBAT and PLA had no significant difference in effects on the adsorption, but their specific mechanisms were somewhat distinct. Faced with the prevalent, worsening coexistence of DMPs and heavy metals in soil, these findings contribute to the ecological risk assessment of DMPs.
研究领域:
环境科学
·
土壤化学
·
污染生态学
·
环境地球化学
·
微塑料污染
·
重金属迁移
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Zhonghua Yang,Kangjie Sun
Polylactic acid (PLA) composites with high straw content face several challenges, primarily due to the inherent brittleness of straw and its poor compatibility with the polymer matrix. In this study, scanning electron microscopy (SEM) was used to analyze the microscopic structure of wheat straw chemically modified by NaOH and the silane coupling agent, and it was concluded that both treatments effectively removed waxes and silica from the surface of the straw, enhanced fiber roughness, and improved interfacial adhesion. Notably, the silane coupling agent treatment not only facilitated the formation of chemical bonds between the straw fibers and the PLA matrix but also filled the interfiber pores, significantly increasing the structural density. Furthermore, the mechanical properties of composites synthesized by hot pressing 60 % pretreated straw, 33 % PLA and 7 % compatibilizer were evaluated, and the results demonstrated that the silane coupling agent-modified composites exhibited superior mechanical properties, with tensile, flexural and impact strengths of 15.07 MPa, 30.83 MPa and 9.95 kJ/m², respectively—approximately 1.2 times higher than those of the NaOH-treated composites. These findings highlight the significant improvement in the mechanical performance of PLA composites through the use of silane coupling agents.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 17
·3547
·
IF 4.967
Naila Ishaque,Nauman Naseer,Muhammad Asad Abbas,Fatima Javed,Shehla Mushtaq,Nasir M. Ahmad,Muhammad Farhan Ali Khan,Naveed Ahmed,Abdelhamid Elaissari
In this research work, polymer blends of poly-lactic acid (PLA)/ethylene vinyl acetate (EVA) were prepared as the drug carrier materials for a bi-layer drug-loaded coating film for coronary stents. Different optimum compositions of blends were prepared by using an intense mixer. Then, the blends were hot-pressed and later cold-pressed to prepare for films of different thickness. The changes in weight, surface analysis and biodegradability with increasing time were studied using Scanning electron microscopy (SEM), weight loss and biodegradability tests. The mechanical and thermal properties of drug-loaded films were studied through universal testing machine (UTM) and thermo-gravimetric analysis (TGA). The effects of PLA, EVA and drug contents on in-vitro drug contents were investigated through the Ultraviolet-Visible Spectroscopy (UV-VIS) chemical analysis technique. The results obtained clearly showed that the addition of PLA promoted the unleashing of the drug whereas the addition of EVA nearly did not have the same affect. The mechanical properties of these various films can be tuned by adjusting the contents of blend parts. The factors affecting the unleashing of the drug became a serious matter of concern in evaluating the performance of bio-resorbable drug eluting stents. As a result, today’s chemical blends may be useful drug carrier materials for drug-loaded tube coatings capable delivering purgative drug in an incredibly tunable and regulated manner.Keywords:cardiovascular disease (CVD);biodegradable drug eluting stents;polymeric blends
研究领域:
医学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Yu Cao,Xueyun Li,Baogou Wu,Zefan Xu,Xiaohu Bing,Qian Ren,Long Wang
Porous polymer foams with engineered surface structures are of great interest for superhydrophobic and self-cleaning applications. However, most existing surface modification techniques rely on complex processing routes and provide limited control over surface porosity and morphology. In this work, we propose a simple and sustainable strategy that integrates interfacial design with supercritical carbon dioxide (scCO 2 ) foaming. Bilayers of poly(lactic acid) (PLA) and PLA/thermoplastic polyurethane (TPU) were constructed, in which dispersed TPU domains acted as heterogeneous nucleation sites, thereby facilitating the formation of porous surfaces. The morphology and wettability of the foams were further tailored through TPU content, hot-pressing temperature, and foaming conditions. Subsequent modification with fluorinated silica nanoparticles imparted robust superhydrophobicity (water contact angle >150°, sliding angle <5°) and durable self-cleaning ability even after repeated contamination. This environmentally friendly method thus provides a scalable route to multifunctional foams and highlights the potential of interfacial design for sustainable polymer materials.
研究领域:
高分子材料科学
·
表面工程
·
绿色化学
·
功能材料
·
纳米复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2019
·Vol. 27
·期 11
·2369-2379
·
IF 2.765
Zhang Meng,Zhang Ai-ling,Li Qiu,Li Fang-fang,Wang Song,Li San-xi
A novel polyethylene oxide (PEO)/polylactic acid (PLA) solid polymer electrolyte (SPE) doped with Liquid crystal ionomer (LCI) was prepared by automatic scraping membrane technology and the liquid crystal property of LCI was proposed as an effective strategy to improve the conductivity. The highest conductivity of the SPE with 0.5 wt% LCI achieve a value of 2.19 × 10 −4 S/cm at 17 °C which is approximately four orders of magnitude higher than that of the original PEO solid polymer electrolyte, conductivity at room temperature is 10 −7 –10 −8 S/cm. This is because the crystallinity is reduced by 25.3% compared to the pure PEO host. Differential Scanning Calorimetry (DSC) and polarizing microscope (POM) characterize the structure and properties of LCI. Electrochemical Impedance Spectroscopy (EIS) shows that the conductivity of the polymer electrolyte with 0.5 wt% LCI increased abruptly at 35 °C as the temperature is higher than T g of LCI, reaching 6.37 × 10 −4 S/cm which is 191% higher than that at 17 °C. There ionic conductivity has been improved extremely by continuous channel for efficient ion transportation, especially at the microtherm. And this change is greater at the elevated temperature regions, in line with the VTF equation. In summary, LCI’s liquid crystal performance can be used as an effective strategy to improve the low temperature conductivity of SPE.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Li Wang,Jingge Xu,Mengmeng Zhang,Hui Zheng,Li Li
This study aimed to reveal the quality changes of soy protein-based meat analogues at 4 °C, and to investigate the efficacy of antimicrobial packaging on maintaining the qualities of meat analogues during 10 days of storage. Cinnamaldehyde (CI) or tea polyphenols (TP) were incorporated in polylactic acid (PLA), polybutylene adipate (PBAT) and starch blends by extrusion technique to prepare antimicrobial packaging. The changes of meat analogues were characterized for morphology, water distribution, texture properties and microbiological analysis during 10 days of storage. Cinnamaldehyde loaded PLA/PBAT film effective retarded the growth of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) at 4 °C, giving an average reduction of E. coli and S. aureus of 3.6 and 4.1 log CFU/g on day 10, respectively. Results suggest that PLA/PBAT-CI film successfully prevents moisture from evaporation, maintains the texture properties and ensures the quality and safety of meat analogues.
研究领域:
食品科学
·
包装技术
·
微生物学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xintu Lin,Ruijie Jin,XinYi Li,Wangfei Liao,Xiaoxia Li,Rongfu Song,Ruilan Xu,Yong Peng,Yuejun Liu
Absorption-dominated electromagnetic interference (EMI) shielding materials are urgently needed to mitigate secondary electromagnetic pollution, yet achieving high absorption in ultrathin, sustainable polymer composites remains challenging. Herein, we propose an eco-friendly strategy combining electrical-magnetic synergistic fillers and an asymmetric porous bilayer architecture to achieve high absorption-dominated EMI shielding in poly(lactic acid) (PLA)-based composites. Graphene@copper-nickel ferrite (GNP@CuNiFe₂O₄) hybrid fillers, synthesized via sol-gel auto-combustion, are incorporated into a PLA/silver-decorated multi-walled carbon nanotubes (MWCNTs@Ag) matrix, yielding an EMI shielding effectiveness (SE) of 26.34 dB with an absorption coefficient of 0.38. To further enhance absorption, we design an ultrathin (135 ± 8 μm) asymmetric bilayer structure: a dense PLA/MWCNTs@Ag/GNP@CuNiFe₂O₄ layer provides impedance matching through electrical-magnetic dual networks, while a porous PLA/silver nanowires layer fabricated via green NaCl-templated leaching serves as a reflective layer. This architecture establishes a unique “absorption-reflection-reabsorption” mechanism, achieving an exceptional EMI SE of 34.00 dB with a high absorption coefficient of 0.54. This work provides a viable strategy for designing ultrathin, absorption-dominant EMI shields for next-generation eco-friendly electronics.
研究领域:
材料科学
·
电磁功能材料
·
聚合物纳米复合材料
·
可持续电子学
·
电磁干扰屏蔽
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Pengtao Fang,Xingmei Lu,Qing Zhou,Dongxia Yan,Jiayu Xin,Junli Xu,Chunyan Shi,Yongquan Zhou,Shuqian Xia
Controlled degradation of macromolecules or natural macromolecules is important for their subsequent utilization. Normally, it is easier to degrade them to monomers than to oligomers in designated molecular weight range, the controlled degradation is much difficult to achieve and has been challenge for the utilization of macromolecules. Here, we proposed a strategy for simultaneous degradation of the inner and outer layers of PET , which avoid the degradation of polymers from the outside to the inside and achieved the controlled degradation. Under high temperature and micro-pressure conditions, PET is transformed from dense to flocculent structure by the swelling effect, which satisfies the need for simultaneous degradation of the inner and outer layers. In addition, a stable “Dawson” type Polyoxometalates (POMs) α 2 -K 8 P 2 W 17 O 61 X(H 2 O)‧16H 2 O (X = Zn, Mn, Co, Ni, Cu) with limited number of catalytic activity center was synthesized and applied to PET alcoholysis to obtain oligomer with given molecular weight range. Under the optimal conditions, PET: EG: POM catalyst = 1.0: 4.0: 0.02 (wt%), 240 °C, 10 min, PET was completely degraded and obtained the oligomer products (Mn < 2000 g/mol) with 72.1 % yield. By investigating the mechanism of the controlled alcoholysis, the formation of flocculent PET was be the key factor in achieving controlled degradation; hydrogen bonding and coordination of POMs are the key interactions to achieve rapid alcoholysis. Finally, oligomers were applied in the preparation of PET-PLA copolymers to follow sustainable route. The incorporation of bio-based polymers demonstrates better inclusiveness to the environment and contributes to harmonious development.
研究领域:
材料科学
·
环境科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 3
·492
·
IF 3.2
Xuanxuan Wang,Ruizhe Wang,Dongxia Han,Yaling Zhou,Qinwei Gao
To construct a high-performance avermectin (Avm) carrier system, this study utilized the advantages of stereocomplex (SC) crystal formation between poly (L-lactic acid) (PLLA) and poly (D-lactic acid) (PDLA) to prepare Avm-loaded stereocomplex polylactic acid (SC-PLA) nanoformulations via the emulsion solvent evaporation method. The results showed the successful formation of SC-PLA after introducing PDLA into the PLLA matrix, and the influence of SC-PLA crystallinity enabled the fabrication of tunable Avm@SC-PLA nanospheres with a regular spherical morphology. Avm@SC-PLA exhibited controlled release characteristics and possessed pH-responsive properties with specific release behaviors under pH 5.5, 7.4, and 8.0 conditions. The Avm@SC-PLA sustained-release nano system had a series of advantages, including controllable particle size, efficient drug loading, excellent sustained-release performance, good UV-shielding ability, high stability, favorable spreadability, and strong affinity for different leaves. In conclusion, the Avm@SC-PLA nanoformulation not only achieves effective loading and stable encapsulation of Avm but also possesses good structural stability and environmental responsiveness. It provides a novel PLA-based carrier strategy for the efficient delivery of Avm and holds potential application value in the pesticide and pharmaceutical fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）