INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jinsen Cui,Zhibo Chen,Yu Lin
A continuing challenge in the most common biodegradable polyester of poly( l -lactide) (PLLA) is to improve the degradation rate in the environment, though it has been widely used in packaging and medical applications. In this study, PLLA/poly(ether- block -amide) (PEBA) blends are prepared by melt blending to investigate the effect of PEBA component on the phase morphology, thermal behavior, mechanical properties, and hydrolytic degradation of the blends. The incorporation of PEBA component is beneficial to the improved toughness and increased water absorption of the blends, and accelerated hydrolytic degradation of PLLA. The blend exhibits the optimal mechanical and hydrolytic degradation properties when the blend mass ratio of PLLA/PEBA is 80/20. The toughness of the blend is increased by 390 % compared to that of pure PLLA. After being hydrolyzed at 58 °C for 240 h, the water absorption, the mass loss and the decrease of molecular weight of the blend is increased by 138 %, 160 % and 40 %, respectively, indicating faster hydrolytic degradation rate of the blend than that of pure PLLA. Furthermore, the accelerated hydrolytic degradation mechanism of PLLA in the blend is revealed. The amorphous region of PLLA is hydrolyzed initially at the phase interface of the blend, and subsequently the crystalline structure of PLLA is degraded. The hydrolysis process causes a change in the relative content of crystalline regions in the system, resulting in an increase in crystallinity of PLLA first and then decrease. These findings provide a new strategy for the design of novel degradable PLLA materials for practical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 10
·1299-1309
·
IF 3.603
Wu Hai-Tao,Jin Bi-Qiang,Wang Hao,Wu Wen-Qiang,Cao Zhen-Xing,Yuan Zhao-Yang,Huang Yue,Li Wei-Hang,Huang Guang-Su,Liao Lu-Sheng,Wu Jin-Rong
Elastomers with outstanding strength, toughness and healing efficiency are highly promising for many emerging fields. However, it is still a challenge to integrate all these beneficial features in one elastomer. Herein, an asymmetric alicyclic structure adjacent to aromatic disulfide was tactfully introduced into the backbone of polyurethane (PU) elastomer. Specifically, such elastomer (PU-HPS) was fabricated by polycondensing polytetramethylene ether glycol (PTMEG), isophorone diisocyanate (IPDI) and p -hydroxydiphenyl disulfide (HPS) via one-pot method. The molecular mobility and phase morphology of PU-HPS can be tuned by adjusting the HPS content. Consequently, the dynamic exchange of hydrogen and disulfide bonds in the hard segment domains can also be tailored. The optimized sample manifests outstanding tensile strength (46.4 MPa), high toughness (109.1 MJ/m 3 ), high self-healing efficiency after fracture (90.3%), complete scratch recovery (100%) and good puncture resistance. Therefore, this work provides a facile strategy for developing robust self-healing polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Zhao Tao,Yu Jinshuo,zhang Xingyang,Han Wenshuang,zhang Shuo,Pan Hongwei,Zhang Qingxin,Yu Xiaoyan,Bian Junjia,Zhang Huiliang
A environment-friendly polymer blends were prepared by the basis of bio-sourced polylactide (PLA) and aliphatic poly(butylene succinate) (PBS) via melt compounding process. 1,4-butanediol and succinic acid was used together with tetrabutyltitanate as catalyst to synthesize PBS via esterified and polycondensation. The chemical structure of PBS was studied by 1 H NMR and FT-IR spectroscopy. The effects PBS content on thermal behavior, mechanical properties, phase morphology, and thermal stability of PLA/PBS blends were systematically investigated. DSC and DMA results showed that glass transition temperature ( T g ) and cool crystallizaiton temperature ( T cc ) of PLA was influenced by PBS. The different phase morphologies of the PLA/PBS blends formed after addition of PBS into PLA. The various phase morphologies from that blend influenced the rheological behavior and further influenced the mechanical properties in PLA/PBS blends, the well dispersed PBS increased the elongation at break of 8.1 ± 0.1 kJ/m 2 with around 80.0% over than neat the PLA. Finally, the PLA/PBS blends have excellent mechanical and thermal properties by analyzing the toughening mechanism and crystallization morphology. Graphical Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 3
·299-309
·
IF 3.815
Wu Xiao,Liu Yun-Xiao,Wu Hai-Peng,Wu Hao,Wang Hai-Jun,Duan Yong-Xin,Zhang Jian-Ming
Incorporation of nanoparticles into polymer blend to obtain finely dispersed morphology has been considered as an effective strategy to prepare nanocomposites. Owing to the renewable and degradable characters, cellulose nanocrystals (CNCs) have been proposed to tailor the phase morphology of poly(L-lactic acid) (PLLA) blend for producing high-performance fused deposition modeling (FDM) consumables. However, the main challenge associated with the ternary systems is the dispersion of the highly hydrophilic CNCs in non-polar PLLA blend by industrial melt blending without involving solution. Herein, with poly(vinyl acetate) (PVAc) modified CNCs powder (a mixture of PVAc grafted from CNCs and PVAc homopolymer latex), the selective dispersion of CNCs in PLLA has been achieved by simple melt processing of PLLA/TPU (polyether polyurethane)/CNCs blend. This results in the ultra-fine TPU droplets at nanoscale in PLLA and improves the melt processibility of composites in FDM due to the decreased viscosity ratio of the dispersed/matrix and the enhanced melt elasticity of PLLA. Combined with the intensive shear and continuous stretch effect during FDM, aligned TPU nanofibers (TNFs) were in situ formed along the elongational flow direction during deposition, which in turn contributed to the improvement of PLLA/TPU/CNCs with 5 wt% filler loading in tensile ductility by 418%, inter-layer adhesion strength and notched impact toughness by 261% and 210%, respectively, as well as achieved good dimensional accuracy and very fine surface quality.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 5
·49762
·
IF 2.52
Yukai Su,Ting Sai,Shiya Ran,Zhengping Fang,Zhenghong Guo
For the purpose of promoting mechanical properties of bisphenol-A polycarbonate (PC) reinforced by rigid organic styrene–acrylonitrile copolymer (SAN) particles, styrene/acrylonitrile/glycidyl methacrylate terpolymer (SAG) was synthesized and applied as compatibilizer for PC/SAN blends. It is found that the phase morphology of PC/SAN/SAG blends is closely related with their mechanical properties. Large continuously distributed SAN phase or spherical dispersed SAN particles with average diameter over 2 μm tend to trigger premature tensile failure of blends due to stress concentration. The incorporation of SAG can simultaneously reinforce and toughen PC/SAN blends by controlling the size and distribution of the dispersed SAN particles. For the blends with fixed PC/SAN ratio, the elongation at break and fracture energy are markedly improved when SAN domain size is reduced by adding appropriate amount of SAG. Typically, for blends with a PC/SAN ratio of 75/25, adding 3 wt% SAG will cause the average diameter of SAN particles to reduce from 2.35 ± 1.20 to 0.74 ± 0.25 μm, meanwhile up to 95% increment in elongation at break and 115% increment in fracture energy is achieved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 38
·49155
·
IF 2.52
Xiaoxuan Zou,Bin Liu,Jiaoxian Wen,Wen Zeng,Bo Jing,Wenli Dai
The polyamide 6-polyurethane copolymer (PA6- b -PU- b -PA6) was synthesized through anionic suspension polymerization and then mixed with polyamide 6/thermoplastic polyurethane (PA6/TPU) and polyamide 6, 6/thermoplastic polyurethane (PA66/TPU) blends using as the compatibilizer. The results show that the PA6- b -PU- b -PA6 copolymers powders several can be obtained through suspension polymerization using dimethicone as disperse medium. The average diameter of PA6- b -PU- b -PA6 copolymer powders decreased with the increasing of PU content. With the addition of PA6- b -PU- b -PA6, the TPU phase dispersed more uniformly in PA6 or PA66 matrix, and the size of TPU dispersed phase decreased obviously. The PA6- b -PU- b -PA6 copolymer with higher PU content shows better compatibilizing effect. Addition of PA6- b -PU- b -PA6 can improve both strength and toughness of the PA/TPU blends. When the amount of PA6-PU25% copolymer was 5 phr, the tensile strength and notched impact strength of PA6/TPU/PA6-PU25% blends increased 29 and 159.4%, respectively, compared to the PA6/TPU blend without compatibilizer.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2013
·Vol. 54
·期 11
·2595-2604
·
IF 1.243
Huan Wang,Jingzhao Mo,Baoqing Shentu,Zhixue Weng
The multiepoxy-terminated low-molecular-weight poly (phenylene oxide) (PPOE) was synthesized by modifying the terminal hydroxyl group of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with epoxy-novolac resin (EPN). The curing kinetics, phase morphology, and thermal stability of the cured EPN/PPOE blends were investigated and compared to the unmodified EPN/PPO and EPN/EPPO (epichlorohydrin-modified PPO) blends. As revealed by the Fourier transform infrared and differential scanning calorimetry analyses, PPOE took part in the curing reaction and formed a crosslinked structure with EPN. The curing rate of EPN/PPOE blends first increased and then decreased with the increase of PPOE fraction. PPOE had both catalytic and steric hindrance effects on the curing reaction. EPN/PPOE blends showed faster curing rate and higher degree of curing than the corresponding EPN/PPO and EPN/EPPO blends. The reactive blending improved the dispersion of PPOE in EPN matrix and the thermal stability of the blend. POLYM. ENG. SCI., 54:2595–2604, 2014. © 2013 Society of Plastics Engineers
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 9
·4610-4623
·
IF 2.936
Hongwei Pan,Zonglin Li,Jia Yang,Xin Li,Xue Ai,Yanping Hao,Huiliang Zhang,Lisong Dong
In this work, poly(lactic acid) and poly(butylene adipate-co-terephthalate) (PLA/PBAT 50/50) were melt-blended in the presence of 4,4′-methylene diphenyl diisocyanate (MDI) which acted as a reactive chain extender. The mechanical properties, phase morphology, thermal behavior and crystalline structure of the blends were investigated. Fourier transform infrared measurements revealed that some remarkable chemical interaction had taken place between the two polymers and MDI. Upon increasing the content of MDI, the blends showed increased tensile strength and elongation at break. With the addition of 0–2 wt% MDI, the impact strength of PLA/PBAT-MDI blends increased from 7.0 kJ m−2 to 70.0 kJ m−2. A large shift towards each other in terms of the glass transition temperature was observed by DMA and DSC analysis. SEM micrographs showed not only a reduction in the PBAT phase size but also a significant increase in interfacial adhesion between the PLA and PBAT phases with increasing of MDI. Furthermore, the toughening mechanism of the oriented samples was confirmed by wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) images; it was possible for the smaller crystallites of blends to form during the course of chain extension.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER TESTING
·
2019
·
IF 2.943
Shuidong Zhang,Yan He,Zesheng Lin,Jun Li,Guo Jiang
Poly (butyleneadipate-co-terephthalate)/thermoplastic starch with high performances was a candidate alternative for polyethylene . In this study, starch, glycerol and tartaric acid (TA) were extruded to fabricate thermoplastic starch/TA (TPS-TA) firstly, then re-extruded with PBAT to achieve PBAT/TPS-TA composites. Effects of TA contents on the structure of TPS, the phase morphology and performances of PBAT/TPS-TA were evaluated by Fourier transform infrared spectroscopy (FT-IR), dynamic thermomechanical analysis (DMA), scanning electron microscopy (SEM), viscosity, dynamic rheological and in vitro biodegradation measurement, contact angle and tensile test, respectively. When its content ranged from 0.5 to 1%, TA acted as acid catalyst to reduce the molecular weight of starch and shear viscosity of TPS, meanwhile, served as coupling reagent to improve the compatibility of TPS and PBAT matrix. Consequently, TPS-TA particles uniformly dispersed in PBAT matrix with 0.18 μm diameter and PBAT/TPS-TA could achieve the homogeneous phase and improved tensile properties . However, when TA content was higher than 1%, the excessive TA would decrease the interface interaction and caused the morphology of PBAT/TPS-TA to reverse from homogeneous phase to “sea-island structure”. This study paved the way for fabricating low-cost PBAT/TPS-TA with 15 times and 40% increments in biodegradation rate and ductility, respectively, when PBAT was used as the control.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zhibo Chen,Jinsen Cui,Yu Lin
We investigate the synergistic effect of ethylene-vinyl acetate grafted maleic anhydride (EVA-g-MAH) and styrene-ethylene-butene-styrene grafted maleic anhydride (SEBS-g-MAH) compatibilizers on the phase morphology evolution, thermal and mechanical properties of polyether- block -amide/ethylene-vinyl acetate (PEBA/EVA) blends. Phase morphology of PEBA/EVA blends shows that the size of dispersed phase decreases in the presence of either EVA-g-MAH or SEBS-g-MAH compatibilizer. The simultaneous use of these two compatibilizers further reduces the dispersed phase size, indicating the synergistic effect of compatibilization. Thermal behavior analysis of PEBA/EVA blends reveals that the crystallization temperature ( T c ), the enthalpy of fusion ( Δ H m ) and the crystallinity of PEBA decrease, the melting point ( T m ) remains relatively unchanged with increasing EVA content. T c and Δ H m increase for PEBA/EVA blends in the presence of compatibilizer. The tensile strength and elongation at break of PEBA/EVA blends decrease first and then increase with increasing EVA content. The simultaneous addition of EVA-g-MAH and SEBS-g-MAH compatibilizers is efficient to significantly improve the mechanical properties of PEBA/EVA blends. For instance, the tensile strength increases from 5.7 to 11.4 MPa, and the elongation at break increases from 73.5% to 600.9% for PEBA/EVA (50/50) blend in the presence of dual compatibilizers compared to the uncompatibilized blend. Dynamic mechanical analysis and rheological behaviors demonstrate that the modulus and complex viscosity are higher in PEBA/EVA blends by the simultaneous addition of two compatibilizers compared with the blends in the presence of one compatibilizer, suggesting the enhancement of interfacial interactions between PEBA and EVA, and further confirming the synergistic effect of compatibilization.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Hai Jiang,Yingli Ding,Juyang Liu,Arun Alagarsamy,Li Pan,Dongpo Song,Kunyu Zhang,Yuesheng Li
A series of poly(L-lactic acid) (PLLA)-b-poly(methyl methacrylate) (PMMA) block copolymers with well-defined chemical structures were synthesized by ring-opening polymerization followed by atom-transfer radical polymerization. These copolymers were investigated as effective A-b-C-type compatibilizers for poly(lactic acid) (PLA) and renewable poly(epichlorohydrin-co-ethylene oxide) (ECO) elastomer blends. Compared to the neat binary PLA/ECO blend, the PLLA-b-PMMA copolymers significantly improved the compatibility of the PLA and ECO phases, leading to enhanced interfacial adhesion and mechanical performance. Interestingly, by tuning the chain structure and adding different amounts of the copolymer, two different phase structures were achieved in the blends: a typical sea-island morphology of the blends with a low content of PLLA-b-PMMA block copolymers (<15%) and a unique tricontinuous phase morphology with a percolated PLLA-b-PMMA copolymer zone of the blend with the addition of 20 wt % asymmetric A181M868 block copolymer. Both the morphological structures endowed the blends with excellent toughness, including a high elongation at break (>260%) and non-broken behavior with an optimum impact strength above 63 kJ/m2. Accordingly, two different toughening mechanisms were proposed for the blends with different phase structures. The PLLA-b-PMMA block copolymers provide highly efficient and versatile A-b-C-type compatibilizers to fabricate high-performance sustainable PLA-based materials for wide application prospects.
研究领域:
材料科学
·
高分子科学
·
可持续材料
·
复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Cailing Gan,Kaikai Shen,Jiahe Nan,Kaixiang Xu,Lichao Yu,Xiaojun Shen,Jipeng Guan
In this study, the Janus nanosheets (JNSs) as compatibilizers have been applied in the immiscible polyamide 6/acrylonitrile-butadiene-styrene copolymer (PA6/ABS) blends. In the JNSs, polystyrene (PS) chains and epoxy groups were grafted on the opposite sides successfully where the epoxy functional groups can react with terminal carboxyl/amino groups of PA6 with ring-opening condensation reactions during melt blending. The obtained JNSs with grafting PS and PA6 chains on each side of silica nanosheets can gradually migrate toward and be anchored at the phase interface with amphiphilicity and the pickering effect. The JNSs exhibited higher interfacial selectivity and compatibilization efficiency. At 2.0 wt% JNSs loading, the ABS dispersed phase transformed from spherical to irregular ellipsoidal shapes, likely due to the rigid characteristics of JNSs altering phase interface curvature and consequently modifying the blend's phase morphology. The gas barrier properties of the blending films can be significantly enhanced from 3.10 × 10 −15 cm 3 cm·cm −2 s −1 Pa −1 to 1.70 × 10 −15 cm 3 cm·cm −2 s −1 Pa −1 with 2.0 wt% JNSs due to the irregular dispersed phase structure and the presence of silica nanosheets at the interface. This study investigates interfacial structure and mechanical properties with JNSs compatibilizers, providing new insights for interface compatibilization strategies and construction of functional composites.
研究领域:
材料科学
·
高分子科学
·
化学工程
·
纳米技术
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）