Polymers
·
2022
·Vol. 14
·期 10
·2039
·
IF 4.967
Ziyun Shen,Liuchun Zheng,Danqing Song,Yi Liu,Chuncheng Li,Jiajian Liu,Yaonan Xiao,Shaohua Wu,Tianbo Zhou,Bo Zhang,Xuedong Lv,Qiyong Mei
A series of non-isocyanate poly(ether urethane) (PEU) were prepared by an environmentally friendly route based on dimethyl carbonate, diols and a polyether. The effect of the chemical structure of polyurethane hard segments on the properties of this kind of PEU was systematically investigated in this work. Polyurethane hard segments with different structures were first prepared from hexamethylene di-carbamate (BHC) and different diols (butanediol, hexanediol, octanediol and decanediol). Subsequently, a series of non-isocyanate PEU were obtained by polycondensation of the polyurethane hard segments with the polyether soft segments (PTMG2000). The PEU were characterized by GPC, FT-IR,1H NMR, DSC, WAXD, SAXS, AFM and tensile testing. The results show that the urea groups generated by the side reaction affect the degree of crystallization of hard segments by influencing the hydrogen bonding of the hard segments molecular chains. The degree of hard segment crystallization, in turn, affects the thermal and mechanical properties of the polymer. The urea group content is related to the carbon chain length of the diol used for the synthesis of hard segments. When butanediol is applied to synthesize hard segment, the hard segment of the resulting PEU is unable to crystallize. Therefore, the tensile strength and modulus of elasticity of butanediol-based PEU is lowest among three, though it possesses the highest urea group content. When longer octanediol or decanediol is applied to synthesize the hard segment, the hard segments in the resulting polyether-based polyurethane are crystallizable and the resulting PEU possesses higher tensile strength.Keywords:non-isocyanate;poly(ether urethane);hard segment
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 9
·1070-1078
·
IF 1.811
Feng Li-dong,Xiang Sheng,Sun Bin,Liu Yan-long,Sun Zhi-qiang,Bian Xin-chao,Li Gao,Chen Xue-si
Poly(ether urethane)s (PEU), including PEUI15 and PEUH15, were prepared through chain-extension reaction of poly(ethylene glycol) (PEG-1500) using diisocyanate as a chain extender, including isophorone diisocyanate (IPDI) and hexamethylene diisocyanate (HDI). These PEUs were used to toughen polylactide (PLA) by physical and reactive blending. Thermal, morphological, mechanical and aging properties of the blends were investigated in detail. These PEUs were partially compatible with PLA. The elongation at break of the reactive blends in the presence of triphenyl phosphate (TPP) for PLA with PEUH15 or PEUI15 was much higher than that of the physical blends. The aging test was carried out at -20 °C for 50 h in order to accelerate the crystallization of PEUs. The PEUs in the PLA/PEU blends produced crystallization and formed new phase separation with PLA, resulting in the declined toughness of blends. Fortunately, under the aging condition, although PEUH15 in blends could also form crystallization, the reactive blend of PLA/PEUH15/TPP(80/20/2) had higher toughness than the other blends. The elongation at break of PLA/PEUH15/TPP(80/20/2) dropped to 287% for the aging blend from 350% for the original blend. The tensile strength and modulus of PLA/PEUH15/TPP blend did not change obviously because of the crystallization of PEUH15.
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
·
2024
·
IF 4.1
Tiancheng Dai,Chao Yi,Shuohong Dong,Mingjie Zhang,Chao Long,Zhen Li,Wenkai Liu,Feng Luo,Jiehua Li,Hong Tan
This study incorporated polydimethylsiloxane (PDMS) and a kind of siloxane-based chain extender (SDO) into polyether urethanes (PEU). The correlation between microphase separation structure and mechanical properties, surface properties and wear resistance were investigated using multiple characterization techniques such as DSC , DMA , SAXS, ATR-FTIR, and XPS . The addition of PDMS significantly reduced the friction coefficient of PEU and enhances the hydrophobicity . The addition of SDO helped to improve the compatibility between PDMS and hard segments of PEU as proved by the fact that the glass transition temperatures of PDMS segments were shifted to higher temperatures and the fraction of loosely hydrogen-bonded carbonyls increased. Due to the improved interfacial adhesion between the immiscible segments, the wear resistance of PEU modified by both PDMS and SDO was obviously enhanced.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Ziyun Shen,Liuchun Zheng,Chuncheng Li,Guoming Liu,Yaonan Xiao,Shaohua Wu,Jiajian Liu,Bo Zhang
DMC-derived poly (ether urethanes) were prepared via isocyanate-free route. The transurethanization reaction of the non-isocyanate route needs higher temperature as compared with the traditional route. There may be some unknown side reactions under high temperature which lead to changes in chemical structure and subsequent thermal and mechanical properties of the novel DMC-derived non-isocyanate polyurethanes (NIPUs). Two 1,6-hexamethylene diisocyanate based polyurethanes (HDIPUs) were prepared as a control. HDIPUs possessed a higher melting point and better mechanical properties than NIPUs. In order to find out the causes of the difference in their thermal and mechanical properties, the structure, crystallization behavior , morphology and microphase separation behavior of NIPUs and HDIPUs were systematically studied and compared in this work. It was found that the structural distinction between NIPUs and HDIPUs was originated from the hard segments. The urea content in the hard segments of NIPUs was much higher than that of HDIPUs. The formation of urea groups was explained by the side reactions during the transurethanization process of NIPUs. Due to the random insertion of urea groups on the hard segments of NIPU, the strength of hydrogen bonding between hard segments and the crystallinity of the hard phase were lower than those of HDIPU. Therefore, the compatibility between the hard phase and the soft phase of NIPU was increased, resulting in poor thermal and mechanical properties.
研究领域:
材料科学
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2013
·Vol. 214
·期 7
·824-834
·
IF 2.386
Lidong Feng,Xinchao Bian,Yi Cui,Zhiming Chen,Gao Li,Xuesi Chen
Poly( L -lactide) (PLLA) is melt blended with poly(ether urethane) (PEU) based on poly(ethylene glycol) blocks via a chain-extension reaction by diisocyanate as a chain extender to improve its flexibility without sacrificing comprehensive performance. The elongation at break of the blends with triphenyl phosphate (TPP) as a reactive blending additive is much higher than that without TPP by physical blending. When 10 wt% PEU is blended, the former elongation reaches to 298%, while the latter one is only approximately 20%. The reactive blending forms a PLLA–PEU block copolymer, thus improving their compatibility. When the weight-average molecular weight ( M w ) of PEUs is 18–90 kg mol −1 , the effect of M w is very little on tensile properties of blends. The rheological properties of the blends are modified through the content and molecular weight of PEU. The complex viscosity ( η *) of PLLA/PEU blends increases with increasing M w of PEU. The η * of the PLLA blend containing 5 wt% PEU in M w 73 kg mol −1 is higher than that of neat PLLA. The water absorption of the PLLA/PEU blends enhances because of the hydrophilicity of PEUs versus neat PLLA.
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
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Man Lu,Chunmei Song,Bo Wan
Hydrophobically Modified Ethoxylated Urethanes (HEURs) were synthesized by a step growth polymerization of polyethylene glycol (PEG, M n = 4000, 6000, 8000) with isophorone diisocyanate (IPDI). The thickeners were produced with different sizes of the hydrophilic section by changing the molar ratios of reactants. The hydrophobic ends, 1-tetradecanol (C14), was constant for all prepared samples. The structure, molecular weight and polymer dispersity index (PDI) of HEUR were characterized by 1 H NMR, IR and GPC respectively. The rheological behavior of the HEUR-thickened latex (Latex/HEUR) was determined by oscillatory and flow experiments. Dramatic increases in viscosity of Latex/HEUR are obtained. Under flow conditions the Latex/HEUR fits the Cross model, showing two regions, a Newtonian and a shear thinning one. Broad thixotropy are observed in hysteresis tests and three interval thixotropy test (3ITT) with decreasing molecular weight of the prepolymer, which was analyzed using a second-order kinetic equation. The results of atomic force microscopy (AFM) and the flow-levelling performance tests for Latex/HEUR films show smoother surface and better levelling with the increase of the hydrophilic component size.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2017
·
IF 5.835
Zhukang Du,Biye Ren,Xueyi Chang,Renfeng Dong,Zhen Tong
Hydrophobically modified ethoxylated urethanes (HEURs) belong to an important class of telechelic associative polymers for improving solution rheological properties in many industrial fields. In this work, we describe the synthesis and solution behavior of a novel hydrophobically modified ethoxylated urethane model polymer (AzoFc-HEUR) end-bifunctionalized by Percec-type mini-dendron 3-(6-ferrocenyhexyloxyl)-5-(6-azobenzenehexyloxy)benzyl alcohol. The telechelic polymer containing both azobenzene and ferrocene moieties in aqueous solution performs multiple stimuli-responsive aggregation and rheological properties dependent on the magnitude of amphiphicity change of functional end groups upon exposure to different external stimuli such as light irradiation and/or redox reaction. It has been demonstrated that the stimuli-responsive hydrophobicity change of end groups induces a reversible micellar transition or rearrangement of micellar aggregates in dilute AzoFc-HEUR aqueous solution and a rearrangement of physical network from a dense network to a sparse network in dense AzoFc-HEUR aqueous solution and vice versa. This work is the first report of such multiple stimuli-responsive rheological properties of telechelic polymers in dense solution induced by photo- and/or redox-stimuli. The results are therefore of interest not only for the fundamental science in the controlled self-assembly of telechelic polymer in aqueous solution but also for specific applications of HEURs in the control of viscoelasticity of polymer solution, fabrication, and transmission of soft materials, medicines and cosmetics, ink for inkjet printers, and flow rate controlling systems, where careful viscosity control is necessary.
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
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Jiaming Chen,Huafeng Dai,Hui Lin,Kehua Tu,Hongjun Wang,Li-Qun Wang
In this work, we proposed a new strategy based on electrospray technique to prepare nanogels. Compared with other methods of preparing nanogels, electrospray technique is more simple and efficient. A biodegradable and multi-responsive poly(ether urethane) (PEU) was synthesized via a facile one-pot method and used as the electrospray material. By using electrospray technique, pH- and redox-responsive poly(ether urethane) nanogels were prepared. The morphologies of the electrospray nanoparticles before and after swelling were demonstrated to be spherical and uniform, as characterized by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Dynamic light scattering (DLS) results showed that the mean hydrodynamic diameter of nanogels was about 500 nm. The pH- and redox-sensitive behaviors of nanogels were studied with DLS and TEM. In acidic media the nanogels dissociated, while in the presence of GSH the nanogels degraded. The nanogels suspension was stored at 4 °C and was stable without aggregation for at least 30 days. Doxorubicin (DOX) can be further loaded into the poly(ether urethane) nanogels. The electrospray nanogels can change the release rate of loaded drug in response to pH and GSH stimuli.
研究领域:
材料科学
·
纳米技术
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zhiping Fang,Shaoyue Zhang,Han Wang,Xue Geng,Lin Ye,Ai-ying Zhang,Zeng-guo Feng
The core–shell structured nanofibers are routinely fabricated by coaxial solution and single-nozzle emulsion electrospinning of two polymers. Herein, the core–shell structured polymeric nanofibers were electrospun from mixed solutions of poly(ether urethane) (PEU) with poly(ε-caprolactone) (PCL) or other biodegradable aliphatic polyesters via a single-nozzle spinneret. For comparison, the mixed solutions electrospinning of poly(carbonate urethane) (PCU) with these polyesters including PCL was also conducted. The morphologies and hierarchical structures of the as-spun nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), in vitro lipase degradation, differential scanning calorimeter (DSC), and Fourier-transform infrared (FTIR) analyses. It was shown that the blends of PEU with PCL or other biodegradable aliphatic polyesters were solely electrospun into the core–shell structured nanofibers with PEU as a shell and PCL or other biodegradable aliphatic polyesters as a core. The thickness of core/shell layers from 833/606 to 193.3/54.2 μm was adjustable by varying the feeding mass ratio from 1:3 to 3:1 of PEU to PCL or other biodegradable aliphatic polyesters. In DSC analysis, the Tonset of PEU@PCL core–shell fiber was 1.31 °C higher than that of the PCL fiber, while Tm was approximate. Furthermore, changing the electrospinning solvents of PEU with PCL or other biodegradable aliphatic polyesters retained the formation of core–shell nanofibers. In contrast, the blends of PCU with these polyesters tended to form co-continuous structured nanofibers. The effects of the physicochemical properties of mixed solutions on the charged liquid droplets, whipped jets, and morphology of the electrospun nanofibers were also inspected. The creation of core–shell nanofibers from the blends of PEU with PCL or other biodegradable aliphatic polyesters was most likely due to the interaction between the inherent thermodynamic phase separation of the polymers and their external stretching kinetic phase separation during electrospinning.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
生物医学工程
✓ 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）