Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2010
·
IF 0.792
Gang Zhang,Ti-Peng Zhao,Yan-Lun Wang,Sui-Lin Liu,Sheng-Ru Long,Jie Yang
Two kinds of new aromatic diamine monomer containing thio-amide unit, bis[4-(p-aminothiophenyl)benzoyl]diamine (ATPBA), were synthesized by two steps, which was reacted with 1,1′-Ferrocenedicarbonyl Chloride (FCDC) to prepare a new polyamide containing ferrocene and thio-ether unit. The polymers were characterized by FT-IR spectrum, 1H-NMR spectrum, X-ray diffraction, element analyzer, DSC, TGA, SEM, AFM and dissolvability experiment and so on. The intrinsic viscosity of FC-PASAA was 0.42–0.58 dl/g obtained with optimum synthesis conditions. The polymers were found to have excellent thermal performance with glass transition temperature (T
g
) of 229.9–276.8°C, initial degradation temperature (T
d
) of 389.2–391.5°C. They could afford flexible and strong films with tensile strength 66.0–83.9MPa. They showed improved solubility in polar aprotic solvents. They were used to preparing separation membrane successfully.
研究领域:
高分子化学
·
材料科学
·
金属有机化学
·
化学合成
·
热分析
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DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yindong Cong,Yi Zhou,Jianna Bao,Xianming Zhang
The effect of metal-ligand coordination on crystallization and melting behaviors of polymers has not been comprehensively investigated. In this study, a series of supramolecular poly( l -lactic acid)s (SM-PLLAs) were prepared by changing various metal ions , length of polymer chains and stoichiometric ratio of ligands to metal ions (L/M). The complexation of metal ions with ligands in SM-PLLAs was confirmed by the intrinsic viscosity and UV–visible spectroscopy. It was found that crystallization rate and crystallinity of SM-PLLAs were strongly dependent on the chain length of precursor in both non-isothermal and isothermal crystallizations. With chain length of 1.6 kg/mol, crystallization of PLLA was completely suppressed regardless of the metal ions, whereas PLLA with longer chain length of 3.0 kg/mol exhibited strong dependence of the type of metal. During the heating process, melting behaviors can be tuned by the strength of metal-ligand coordination, temperature and the degree of complexation. Unlike PLLA precursor and SM-PLLA coordinated with Cu 2+ exhibited multiple melting behaviors, only a single melting peak was appeared in PLLA bonded with Co 2+ , indicative of suppression of recrystallization during heating. With ratio of ligand to Co 2+ increased from 1:1 to 6:1, crystallization and melting behaviors were tuned by the content of free and bounded PLLA chains. As compared to Cu 2+ , SM-PLLA coordinated with Co 2+ exhibited higher complex modulus and viscosity due to the high bond strength , as well as a more stable structure underwent heating and shear, making diffusion of polymer chains and the structural adjustment more difficult. This work may shed light on understanding the intricate interplay of metal-ligand coordination effects on the crystallization and melting behaviors of polymers, which may be helpful with the design and making out the relationship between structure and properties of supramolecular polymers .
研究领域:
聚合物科学
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材料科学
·
超分子化学
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产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2013
·
IF 0.807
Jiaojiao Shang,Guo Yao,Shaojian Lin,Jianwu Lan,Xia Huang,Wen He
A series of thermoplastic poly(ester-imide-ether) (PEIE) elastomers, with different ratios of soft/hard segment 85/15, 80/20 and 70/30, were prepared from 1, 4-butanediol (BD), poly(tetramethylene glycol) (PTMG) and imide dicarboxylic acid monomer based on 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and glycine (GLY). The chemical structures of the imide dicarboxylic acid and PEIEs were characterized by FT-IR and 1H-NMR, respectively. The intrinsic viscosities, thermal properties and mechanical properties of these PEIEs were investigated. The results show that introduction of imide group endows the PEIEs with excellent thermal stability, the melting point of PEIEs at about 220°C, and the temperature of 5% weight loss appears at the range of 332–358°C. In addition, the mechanical properties of PEIEs are also improved with the increment of imide units, the maximum stress and strain reached to 17.15 MP and 1043.75%, respectively.
研究领域:
高分子化学
·
材料科学
·
热分析
·
机械工程
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Yan Chen,Fajian Ren,Jian gang Dai,Dongmei Li,Shajie Luo
A series of modified poly(ether ether ketone)s containing different content of benzene pendant group in the molecular chain have been successfully synthesized with 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bisphenol A and 4,4′-difluorobenzophenone by nucleophilic substitution. The inherent viscosities of obtained polymers were in the range of 0.261–0.889 dLg−1. They were found to have high glass transition temperatures (Tg) of 150–168°C and 148–169°C (examined by DSC and DMA, respectively), good thermal stability with 5% weight-loss temperature (T5%) of 439–469°C. The tensile strengths of the obtained polymers were 67.7–86.6 MPa, and the storage modulus was over 0.9 GPa at about 140°C. The modified poly(ether ether ketone)s showed the excellent solubility property, they could be processed by solution method. Additionally, the obtained polymers had good optical transmittance (>70%) at 400 nm, suggesting that they have potential to be applied to the heat-resistant optical films.
研究领域:
材料科学
·
高分子化学
·
光学材料
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DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Qisong Lin,Feng Gao,Yongjun Wang,Wangyang Lu,Wenxing Chen
Antimony-free poly(ethylene terephthalate) (PET) has been synthesized through polycondensation of p -phthalic acid and ethylene glycol , and then subjected to a viscosity-increasing process by liquid-state polycondensation (LSP). For both of these processes, a novel environmentally benign ethylene glycol-soluble Ti/Mg bimetal (TM) catalyst has been used. The structure of the TM catalyst has been comprehensively characterized and its catalytic activity in the polycondensation reaction has been evaluated and compared with those of other titanium-based catalysts. The results reveal that the TM catalyst is a chelated complex with high catalytic activity for polycondensation to afford PET without significant side reactions. Indeed, the LSP process catalyzed by TM affords a PET product with high intrinsic viscosity suitable for industrial yarn production (1.08 dL/g) within 60 min, and that exhibits higher thermostability with increasing intrinsic viscosity. Finally, the kinetics of the TM-catalyzed polycondensation has been probed based on the variation of intrinsic viscosity with increasing polycondensation time.
研究领域:
材料科学
·
聚合物化学
·
催化
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2016
·
IF 3.187
Yingying Ren,Zhiyong Wei,Xuefei Leng,Tong Wu,Yufei Bian,Yang Li
Highly branched polymers (HBPs) are a special class of functional polymeric materials and possess unique properties due to their unique topological structure. A new series of highly branched linear–comb and star–comb amorphous poly(trimethylene carbonate)s (PTMC) and crystalline poly(ε-caprolactone)s (PCL) with well-defined structure and high molecular weight were first synthesized using hydroxylated polybutadiene (HPB) as macroinitiators by simple “one-step” and “graft from” strategies. It is expected that the impact of long-chain, highly branched architecture on the properties of amorphous and crystalline polymers, respectively, is different. We explored systematically for the first time the effect and comparison of branched architectures on the physical and chemical properties of highly branched PTMCs and PCLs, including the intrinsic viscosity, glass transition, thermal degradation, creep property, rheological property, and crystallization and melting behaviors. It is found that the intrinsic viscosities in solution for both comb-branched PTMCs and PCLs were much lower compared with their linear and star counterparts arise from more compact structure and smaller hydrodynamic volumes. For amorphous PTMC, the creep strain and rate increased remarkably with degree of branching increasing due to the shorter side chains making it difficult for the highly branched molecules to entangle. For crystalline PCL, both WAXD and DSC analysis of PCLs with different topological structures indicated that the comb branched architectures have no significant influence on the crystal structure of PCL, but greatly promote the crystallization behavior, e.g., higher crystallinities. The deep understanding of structure–property relationship expects to guide the synthesis of designed functional polymer materials and the processing of polymer products.
研究领域:
聚合物科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50940
·
IF 3.125
Hao-hao Ren,Peng-cheng Li,Ya-nan Wu,Jin-bo Hu,Gang Zhang,Yong-gang Yan
A series of semi-aromatic copoly(ether ether amide)s (hydroquinone (HQ) (0%)-HQ (100%)) were synthesized by 1,1-bis(4-hydroxyphenyl)-1-phenylethane (BHPPE), 1,4-benzenediol (HQ) and 1,6- N , N ′-bis(4-fuorobenzamide) hexane (BFBH) in this work. The inherent viscosities of copoly(ether ether amide)s were in the range of 0.487–0.769 dl g −1 . Following with increase of the content of HQ, the resultant polymers were converted from amorphous to crystalline. The copolymers were found to have high glass transition temperatures ( T g ) of 141.4–155.6°C and weight-loss temperature ( T 5% ) of 423.3–434.3°C. They can be hot-pressed into films with tensile strength of 63.3–87.6 MPa, and storage modulus over 0.8 GPa at about 150°C, indicating good thermal and mechanical property of the obtained copolymers. The results of rheological property showed that the copolymers had good melt flowability and thermal stability. Additionally, the introduction of HQ improved the corrosion resistance of copolymers, the obtained polymers HQ (60%), HQ (80%) and HQ (100%) exhibited better corrosion resistance than that of HQ (0%). Especially, HQ (80%) and HQ (100%) were insoluble in organic polar solvents such as DMSO, DMF because of their crystalline nature, indicating that they had potential to be applied to the corrosion-resistant materials.
研究领域:
聚合物科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2025
·
IF 2.8
Dai Yunling,Ma Xinyu,Du Pan,Lin Qiurui,Zhang Wei,Yang Yining,He Xianru
Polymers with lower critical solution temperature (LCST) had broad application prospects in biomedicine and drug delivery. The copolymer poly(N-vinylpyrrolidone-co-diacetone acrylamide) (P(NVP-co-DAAM)) was prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization of N-vinylpyrrolidone (NVP) and diacetone acrylamide (DAAM). Ultraviolet transmittance was utilized to investigate its solution behavior. The results showed that by adjusting molar ratio of two monomers, the lower critical solution temperature (LCST) of the copolymer could be modulated for 12.0–59.9 °C. Variable-temperature Fourier transform infrared spectroscopy examined the interactions between the copolymer and water molecules. The results indicated that the hydroxyl absorption peak of the solvent water molecules exhibited blue-shift with rising temperature, indicating weakening interactions between copolymer and water molecules. Two-dimensional infrared correlation spectroscopy results showed that interaction between water molecular and DAAM structural unit weakened prior to that between water molecular and NVP structural unit due to rising temperature. The concentration dependence of the increasing specific viscosity indicated that the aggregation concentration (Cg) of the polymer solution decreased with increasing temperature.Dynamic light scattering experiments showed that the hydrodynamic size increases with increasing temperature above the LCST. The results comprehensively showed that the P(NVP- co -DAAM) copolymer exhibits a sensitive temperature response, and the P(NVP- co -DAAM) structure has good biocompatibility, indicating its significant potential for application in biomedicine and related fields. Graphical
研究领域:
高分子科学
·
材料科学
·
生物医学工程
·
药物输送
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yongzhi Liu,Huaili Zheng,Yanyan An,Jie Ren,Xinyu Zheng,Chun Zhao,Shixin Zhang
In this work, the novel β-cyclodextrin based polymeric flocculants (CADs) were synthesized and applied on the treatment of humic acid (HA)-kaolin wastewater. Acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (DAC) were grafted onto β-cyclodextrin (β-CD) by ultrasound assisted initiation using ceric ammonium nitrate as initiator. The synthesized conditions were optimized by evaluating the intrinsic viscosity and grafting efficiency of CADs. Furthermore, the characterization methods including Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR), thermogravimetric/differential scanning calorimetry (TG/DSC) and scanning electron microscopy (SEM) were used to evaluate and analyze the molecular structure and surface morphology of graft copolymers. In flocculation experiments, the effects of dosage, flocculant types, solution pH and flocs properties on flocculation performance were investigate in detail. CADs exhibited more satisfactory turbidity and HA removal performance than the synthetic cationic flocculants (PAD) and the non-ionic graft polymers (CAM). At the optimum dosage 4 mg/L, the maximum turbidity and HA removal rate of CAD 1# was 97.5% and 68.3%, respectively. Furthermore, CAD 1# exhibited a good flocculation performance and wide flocculation window in the pH range of 2.0–8.0. Lastly, the flocculation mechanism of CAD was detailed discussed by the investigation of zeta potential, surface tension, flocs FTIR and XPS spectra. Results indicated the unique hydrophobic internal structure of β-CD played an important role in improving the removal rate HA of CAD.
研究领域:
环境工程
·
聚合物化学
·
水处理
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DOI
高影响因子
危险品化学品经营许可证（带存储）