CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 11
·1152-1161
·
IF 2.804
Shi Lei,Zhang Ruo-Yu,Ying Wu-Bin,Hu Han,Wang Yu-Bin,Guo Ya-Qian,Wang Wen-Qin,Tang Zhao-Bin,Zhu Jin
Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4′-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. Based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Luhong Zhang,Hongfang Guan,Na Zhang,Bin Jiang,Yongli Sun,Na Yang
In this study, a high flux loose nanofiltration (NF) membrane was fabricated for the desalination of dye wastewater through a facile method which combined doping and surface grafting. First, PES ultrafiltration substrate was prepared via non-solvent induced phase separation by introducing multi-hydroxyl β-cyclodextrin (β-CD) into the casting solution as hydrophilic additive. Then, titanium dioxide (TiO 2 ) nanoparticles were grafted uniformly on membrane surface with the assistance of 1, 6-hexamethylene diisocyanate (HMDI), resulting in the enhancement of surface hydrophilicity and separation performance of the resultant membranes. Remarkably, the membrane prepared at optimized conditions achieved a high pure water flux (52.0 L·m −2 ·h −1 at 0.2 MPa) and high permeate flux for dyes (e.g. 30.5 L·m −2 ·h −1 for Congo Red at 0.2 MPa). It also exhibited high rejection for dyes (e.g. 97.4% for Congo Red) and high transmittance of salts (e.g. 94.0% for Na 2 SO 4 ). Moreover, the membrane possessed good antifouling performance with a high flux recovery ratio of 93.7% after fouled by humic acid (HA). The results indicated that the novel loose NF membrane had an impressive potential application for dye wastewater treatment.
研究领域:
膜科学
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环境工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2020
·
IF 0
Qing Luo,Jing Chen,Pitchaimari Gnanasekar,Xiaozhen Ma,Dongdong Qin,Haining Na,Jin Zhu,Ning Yan
Shape-memory biomaterials, especially those stable against degradation, are attractive for applications in the biomedical fields, such as artificial bone scaffold material, artificial blood vessel material, and so on. In this study, shape-memory polyurethanes (SMPUs) were synthesized based on poly(ε-caprolactone) (PCL) diol, dicyclohexylmethylmethane-4,4′-diisocyanate (HMDI), and planar ring chain extenders. Catechol (PCTE), 1,4,9,10-anthracenetetrol (ANTE), and 2,3,6,7,10,11-hexahydroxytriphenylene hydrate (HHTP) with different rigidities were used as the stationary phase to produce the SMPUs. Shape-memory and degradation properties of the SMPUs were characterized. It was found that poly(PCL & PCTE urethane) (PCPU), poly(PCL & ANTE urethane) (PCAU), and poly(PCL & HHTP urethane) (PCHU) showed outstanding shape-memory properties with the shape fixity rate of 90.9%, 90.4%, and 94.0% and shape recovery rate of 99.1%, 99.1%, and 98.7%, respectively, following the triple-shape-memory testing procedure. Moreover, during the 6 month hydrolysis process, all SMPUs had 90.6%–94.3% of weight remaining, demonstrating good hydrolysis resistance with highly stable thermomechanical performance. These SMPUs possess excellent shape-memory properties and are highly promising for applications as implant materials in vivo.
研究领域:
生物医学材料
·
高分子化学
✓ 已验证
产品关联
DOI
Soft Matter
·
2020
·Vol. 17
·期 8
·2191-2204
·
IF 3.14
Yanlong Luo,Xianling Chen,Jialiang Chen,Zhipeng Wu,Hongming Ma,Xuejing Liu,Bo Xiang,Xiaofeng Ma,Zhenyang Luo
An intrinsic self-healing polyurethane (PU) elastomer with excellent self-healing efficiency was prepared. The self-healing properties of this elastomer as well as the temperature dependence of self-healing can be tailored by regulating the molar ratio of hard to soft segments. The self-healing efficiency of 92.5% is the highest when the molar ratio of 4,4-methylenedicyclohexyl diisocyanate (HMDI) to polypropylene carbonate polyol (PPC) is 1.3 and the temperature is 25 °C. In situ temperature swing infrared spectra and low-field nuclear magnetic resonance reveal that the soft segment, PPC, endows PU with a dense dynamic hydrogen bond network, and the dissociation and reconstruction of the hydrogen bond network enable the PU to heal. To date, the exchange of hydrogen bonds has not been observed intuitively through experimental means. Therefore, the number, type, strength, lifetime, and the exchange of hydrogen bonds in the self-healing process at different temperatures were investigated by molecular dynamics (MD) simulation. The simulated results show that the type of hydrogen bond exchange between functional groups will be affected by temperature. The hydrogen bonds between urethane and urea groups play a leading role in the self-healing properties due to the high strength and a large number of hydrogen bonds at both 25 and 50 °C. The stronger strength, longer lifetime, and greater number of effective hydrogen bonds at 25 °C make the self-healing efficiency of PU higher than at 50 °C.
研究领域:
材料科学
·
聚合物化学
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Qian Zhang,Chukwunonso Peter Okoli,Lingqing Wang,Tao Liang
Two kinds of cross-linked starch polymers were synthesized and used as adsorbent materials for the adsorption of o-nitrophenol (o-NP), p-nitrophenol (p-NP), 2,4-dinitrophenol (2,4-DNP) and 2-s-butyl-4,6-dinitrophenol (DNBP) from aqueous solutions. Results from adsorption experiments showed that the polymer 1 prepared by 4,4′-methylene-bis-phenyldiisocyanate (MDI) as cross-linking agent exhibited higher adsorption behaviors than that of the polymer 2 prepared by hexamethylene diisocyanate (HMDI). Equilibrium and thermodynamic of four nitrophenols on polymer 1 were further studied. Analyzed experimental data showed that the Freundlich model fitted the isotherm data better than the Langmuir model of the four nitrophenols onto polymer 1. The thermodynamics for the adsorption of the nitrophenols on polymer 1 were estimated in the range of 303–333 K. It has been found that the values of Gibbs free energy (ΔG) became more negative with decreasing temperature, which indicated that the adsorption process was more favorable at low temperature.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2022
·Vol. 23
·期 20
·12613
·
IF 6.208
Wencai Wang,Xueyang Bai,Siao Sun,Yangyang Gao,Fanzhu Li,Shikai Hu
Polysiloxanes have attracted considerable attention in biomedical engineering, owing to their inherent properties, including good flexibility and biocompatibility. However, their low mechanical strength limits their application scope. In this study, we synthesized a polysiloxane-based polyurethane by chemical copolymerization. A series of thermoplastic polysiloxane-polyurethanes (Si-TPUs) was synthesized using hydroxyl-terminated polydimethylsiloxane containing two carbamate groups at the tail of the polymer chains 4,4′-dicyclohexylmethane diisocyanate (HMDI) and 1,4-butanediol as raw materials. The effects of the hard-segment content and soft-segment number average molecular weight on the properties of the resulting TPUs were investigated. The prepared HMDI-based Si-TPUs exhibited good microphase separation, excellent mechanical properties, and acceptable repeatable processability. The tensile strength of SiTPU-2K-39 reached 21.5 MPa, which is significantly higher than that of other flexible polysiloxane materials. Moreover, the tensile strength and breaking elongation of SiTPU-2K-39 were maintained at 80.9% and 94.6%, respectively, after three cycles of regeneration. The Si-TPUs prepared in this work may potentially be used in gas separation, medical materials, antifouling coatings, and other applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 62
·期 17
·3979-3991
·
IF 3.9
Hongxiu Wei,Xiaofei Wang,Wenkai Liu,Shuohong Dong,Tiancheng Dai,Feng Luo,Zhen Li,Hong Tan,Jiehua Li
In this study, polyurethane (PU) hydrogels were synthesized via mercapto curing reaction to elucidate the effect of molecular interactions between isocyanate and soft segments on the properties of hydrogels. Further, the mesh size, mechanical properties, hydrophilicity, and biological properties of the PU hydrogels were determined. In the isocyanate series, the structural regularity and rigidity of 4,4′-dicyclohexylmethane diisocyanate (HMDI) favored the formation of hydrogel materials with small mesh size, high modulus, and low water absorption. In contrast, l -lysine diisocyanate (LDI) favored the materials with large mesh size, low modulus, and good hydrophilicity. In the soft-segment series, the strong hydrogen bonds of polycarbonate diol (PCDL) favored the formation of materials with small mesh size, dense cross-link points, and high modulus, whereas weak hydrogen bonds of polytetrahydrofuran ether glycol (PTMG) favored the hydrogel materials with small mesh size, few crosslink points, and low modulus. PU hydrogels exhibit excellent cytocompatibility, anti-cell adhesion, and anti-inflammatory properties. Therefore, this study offers valuable insights into understanding the chain structure and macroscopic properties, thus contributing to preparing PU hydrogels with varying performances, as desired. Graphical
研究领域:
材料科学
·
高分子化学
·
生物材料
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Lianxiong Guan,Zhi Zeng,Wei Liu,Tengfei Wang,Shiyao Tian,Sheng Hu,Dating Tian
Amphiphilic AIE nanoparticles (CD-TPE) were obtained by linking γ-cyclodextrin (γ-CD) and 1, 2-diphenyl-1, 2-( p -hydroxyphenyl)-ethylene (OH-TPE-OH) by an esterification reaction using hexamethylene diisocyanate (HMDI) in a one-step process. The CD-TPE was characterized by FTIR, 13 C NMR, DSC , XRD, particle size analysis , TEM, and FL. The obtained CD-TPE had good water dispersibility and could self-assemble into AIE nanoparticles. The large cavity of CD-TPE provided convenient conditions for the loading of doxorubicin (DOX) and slow-release DOX with the loading and release rates of 67.4 % and 71.3 % (pH = 5.4), respectively. The DOX release kinetic model was suitable for the Bhaskar model. Cytotoxicity analysis and cell imaging of CD-TPE were performed, showing that CD-TPE has good biocompatibility and excellent cell imaging performance. Moreover, both in vitro and in vivo antitumor experiments showed that CD-TPE has promising applications in drug delivery.
研究领域:
生物医学工程
·
纳米技术
·
药学
·
材料科学
✓ 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）