COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 11
·1559-1569
·
IF 1.536
Ma Xiaoqin,He Ling,Huang Shengying,Wu Youshen,Pan Aizhao,Liang Junyan
A total of 1/2/4/6-armed molecular architectured polyhedral oligomeric silsesquioxane (POSS) fluoropolymers were synthesized via atom transfer radical polymerization (ATRP) by linear ( L ), dicephalus ( D ), four-arm ( T ), and six-arm ( S ) initiators initiating same content of methyl methacrylate (MMA), methacrylate POSS (MA-POSS), and dodecafluoroheptyl methacrylate (DFHM). The obtained L/D/T/S -(PMMA -b -PMAPOSS -b- PDFHM) 1/2/4/6 had increased molecular weight with arm increase. Driven by the stereo-hindrance and curvature effects of segments in tetrahydrofuran (THF), they assembled into the decreased spherical core-shell micelles (250–100 nm) with arm increase as PMA-POSS/PDFHM core and PMMA shell. Because of easy surface migration of fluorine-containing groups in small micelles, the casted film by S -(PMMA -b -PMAPOSS -b- PDFHM) 6 performed the fluorine-rich (46.44%) and rough (5.41 nm) surface, and therefore with the hydrophobic (112°) and low water adsorption surface (1522 ng/cm 2 ). Also, POSS-fluoropolymers obtained the enhanced thermostability with arm increase. It is believed that this research will provide a bright view for design and application of POSS-fluoropolymers.
Graphical abstract
研究领域:
高分子化学
·
材料科学
·
表面工程
·
纳米技术
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Xinle Yao,Yanzhao He,Yuxiong Guo,Zhongying Ji,Chufeng Sun,Xin Jia,Xiaolong Wang,Feng Zhou
To address the requirements of polyimide (PI) parts in the harsh Low Earth Orbit (LEO), a 3D printable PI composite with superior tribological and atomic oxygen (AO) irradiation resistant properties was proposed by employing methacryloxypropyl polyhedral oligomeric silsesquioxane (MPA-POSS) as a crosslinking agent in the photosensitive PI inks to obtain POSS-contained PI composite (PI-POSS composite). The resultant PI-POSS exhibits unique comprehensive performance including excellent AO irradiation resistance of an erosion yield of 2.86 × 10 −24 cm 3 /atom, 50 % lower than that of PI without POSS, and anti-wear and friction reducing properties with a coefficient of friction of 0.1 and a wear rate of 4.4 × 10 −6 mm 3 /N∙m. Importantly, the PI-POSS inks have excellent VP 3D printability, enabling the creation of complex, AO irradiation resistant, self-lubricating PI-POSS parts. These findings highlights the significant potential of such PI-POSS composite in aerospace applications within LEO.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2019
·
IF 5.667
Nana Lu,Yingxi Lu,Shengsen Liu,Chuanyu Jin,Sha Fang,Xianfeng Zhou,Zhibo Li
Organic–inorganic oligo(ethylene glycol)–polyhedral oligomeric silsesquioxanes (OEGn–POSS) hybrid materials are woven into macroscopically shaped entities by thiol–ene chemistry. The mechanical behavior and interfacial nature of the OEGn–POSS materials are easily tailored by changing the length of OEGn. The nanostructured OEGn–POSS materials exhibited excellent bioactivity to form hydroxyapatite, whose morphology was also dependent on the molecular weight of OEGn. Among them, OEG2–POSS materials enhanced the in vitro differentiation of adipose-derived stem cells to osteoblasts and promoted the in vivo bone formation within a femoral condyle defect site, but they could be limited by the mismatch rates between the degradation and new bone formation. Thus, OEG2–POSS could be practically applied for bone regeneration by optimizing the degradation rate based on its key structural features, which would be of great benefit to bone tissue engineering in the future.
研究领域:
材料科学
·
组织工程
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Haipeng Bai,Yaping Zheng,Ruilu Yang
Six kinds of liquid-like trisilanol isobutyl-POSS derivatives are designed and synthesized to study the influences of their structures on capturing CO 2 . The derivatives are different in bonding types, NH content, flow ability, grafting ratio or molecular size. The CO 2 capture property of these derivatives is tested. It is found that bonding types can affect the recycle property, NH content can affect the chemical absorption , molecular size can affect the physical adsorption, and flow ability can affect both chemical absorption and physical adsorption. Furthermore, the physical adsorption is determining factor that cause differences from liquid-like derivatives to traditional amine based solvents CO 2 absorbents.
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
COLLOID AND POLYMER SCIENCE
·
2012
·Vol. 291
·期 4
·789-803
·
IF 2.331
Zhang Xiaojing,Wang Chaojun,Fang Shaoming,Sun Jiashu,Li Chong,Hu Yuelei
In this paper, a series of hybrid star PLLA (sPLLA) with different arm lengths was synthesized via the hydrosilylation between octakis(dimethylsiloxy) silsesquioxane (Q 8 M 8 ) and functionalized PLLA macromolecules with vinyl end groups (mPLLA). mPLLA was synthesized by ring-opening polymerization of l -lactide using 2-hydroxyethylmethacryl as an initiator in the presence of stannous 2-ethylhexanoate as a catalyst. The obtained sPLLA has low polydispersity with polydispersity index values from 1.29 to 1.30. The arm numbers of sPLLA vary from 5 to 7 and decrease with the increase in the length of the mPLLA arm due to the steric hindrance, which are estimated by 1 H NMR analysis. The branched structure of sPLLA is also evidenced by the lower intrinsic viscosity when compared with the linear mPLLA with similar molecular weight. Both the glass transition temperatures ( T
g ’s) and melting temperatures ( T
m ’s) of sPLLAs are higher than those of the mPLLA arms. The incorporation of polyhedral oligomeric silsesquioxane (POSS) does not change the crystalline structure of PLLA, while the crystallinity of sPLLA is enhanced as the result that the POSS core acts as a heterogeneous nucleating agent in the matrix to promote the crystallization ability of PLLA. High-resolution transmission electron microscopy observation suggests that POSS disperses in the crystalline PLLA matrix as 5–20 nm aggregates. Microspheres of sPLLA with mean diameter 1 to 2 μm were prepared via emulsion solvent evaporation method. The sPLLA microspheres have higher loading capacity and encapsulation efficiency and lower drug release rate than mPLLA microspheres.
研究领域:
材料科学
·
药物递送
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELASTOMERS AND PLASTICS
·
2016
·
IF 0.671
Zhanglin Yuan,Jincheng Wang
Research on the structure and properties of room-temperature vulcanizated silicone rubber (RTV) composites with a type of incompletely condensed polyhedral oligomeric silsesquioxane (POSS) was conducted. Trisilanolphenyl POSS (TPOSS) was synthesized and characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), proton nuclear magnetic resonance (1H NMR), and scanning electron microscopy (SEM). FTIR spectra suggested successful bonding of TPOSS. XRD analysis illustrated that POSS exhibited a crystal behavior while TPOSS had an amorphous structure. The chemical shift of 1H NMR at 7.1–7.8 ppm and 3.71–3.73 ppm further confirmed the structure of TPOSS. TPOSS particle was aggregated with large size observed from SEM Then, TPOSS was applied in RTV composites. Properties of RTV/TPOSS composites such as swelling behavior, tensile strength, elongation at break, thermal stability, and flame retardance were researched and compared. Results showed that the TPOSS were beneficial for increasing the cross-linking points and forming the effective three-dimensional networks in RTV composites. Tensile tests revealed that the tensile strength of RTV/TPOSS-3 was 20% higher than that of pure RTV, and the elongation at break of RTV/TPOSS-1 also showed an improvement. Thermogravimetric analysis studies demonstrated that RTV/TPOSS-5 presented the highest values of temperature at 5% mass loss and temperature at maximum mass loss rate of 437.5°C and 573.7°C, respectively. In addition, the residue of RTV/TPOSS-9 increased to 61.0%. Horizontal burning test found that the burning rate with 9% content of TPOSS was strikingly decreased by 66.4% compared with pure RTV.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2011
·Vol. 32
·期 9
·1343-1351
·
IF 0.998
H.L. Cai,K. Xu,H. Liu,X. Liu,Z.E. Fu,M.C. Chen
Two types of silsesquioxanes were synthesized by hydrolytic condensation reaction, and then were incorporated into polycarbonate (PC) matrix by melt blending to prepare PC/POSS hybrid composites. The study of morphology of the composites showed that octaphenylsilsesquioxane (PH-POSS) exhibited partial compatibility with PC matrix, while 3-glycidyloxypropylsilsesquioxane (EP-POSS) could react with phenolic hydroxyl groups of matrix. Thermal and mechanical properties were studied by DSC, TGA, and DMA. The result showed that the incorporation of POSS not only improved thermal stabilities of PC composites, but also retarded their thermal degradation. Si O fractions left during POSS degradations were the key factor governing the formation of a gel network layer on the exterior surface. This layer possessed more compact structures, higher thermal stabilities, and some thermal insulation. In addition, percentage residues at 700°C ( C 700 ) significantly increased from 10.8 to 15.5–22.8% in air. The storage modulus of two series of composites was slightly improved up to 90°C; furthermore, the temperature range of the rubbery state of them shifted to high temperature. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2023
·Vol. 13
·期 4
·2461
·
IF 2.7
Jianliang Jiang,Jingbo Shen,Xiao Yang,Dongqi Zhao,Yakai Feng
To improve the thermal and mechanical properties of epoxy resins, epoxy-functionalized POSS (E-POSS) and glass fiber (GF) were used to reinforce epoxy resin (E51) composites. The tensile, thermo-mechanical, fractured, and thermal tests were carried out to characterize these hybrid materials. The results show that E-POSS and GF could significantly improve the mechanical and thermal properties of epoxy resins due to high crosslink density of resin matrix and synergistic interaction between the epoxy resin, E-POSS, and GF. Compared with the pure E51 resin, the tensile strength of the E51 + E-POSS (10%) + GF (16%) sample increased by 257.6%, and the thermal decomposition temperature (Td5%) of the E51 + E-POSS (10%) + GF (16%) sample increased by 32 °C to 378 °C.Keywords:epoxy resin;epoxy-functionalized POSS;composites;glass fiber
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Xiong Ao,Li Junqian
Fabrication of waterproof decorative paintings has attracted a great deal of interest. In this work, in situ reaction using poly(glycidyl methacrylate) (PGMA) and polyhedral oligomeric silsesquioxane with amino group at end (amino-POSS) was utilized to fabricate coatings at surfaces of papery/cloth decorative paintings via spray, which endowed the decorative paintings with excellent hydrophobicity, transparency, and weather ability. Firstly, ring opening of epoxy groups in PGMA, cross-linking structure in coatings, and strong coating/painting interface adhesion were achieved. Then, surface morphology of coatings was observed, and high surface roughness was confirmed. Next, high transparency and thermal stability of coatings were confirmed. Finally, surface water-contact-angles (WCAs) of coatings with various substrates were tested as a function of POSS content. Weathering resistances of coating surface on cloth substrate were studied. Coatings exhibit excellent properties such as high light transmittance (over 80%), high glass-transition temperature (upper limit ~ 113 ℃), high hydrophobicity (maximum WCA ~ 149°), and strong weathering resistances (the aged WCAs over 140°). Work innovation lies in simultaneously gained high hydrophobicity, good transparency, and strong weather ability. This work might pave a road for fabricating excellent coatings for protecting decorative paintings.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2016
·Vol. 28
·期 6
·658-664
·
IF 1.823
Qiyang Jiang,Jinmeng Hao,Yanfeng Wei,Jianxin Mu
Block and random polyhedral oligomeric silsesquioxane (POSS)/fluorinated poly aryl ether sulfone tricopolymers were synthesized using different synthetic strategies to investigate the effect of sequence distribution on their thermal, dielectric, and surface properties. Analyses indicated that all block and random copolymers showed similar growth tendency of water contact angles and T g values, downward tendency of k values with increased content of POSS. The block copolymer displayed higher T g values up to 187°C than random copolymers (173°C) under the same POSS molar percentage, which were highly related to their different sequence distribution. The dielectric constants of the tricopolymers were drastically reduced because of the presence of POSS and fluorine, and the dielectric constant could achieve as low as 2.71 (1 MHz). Besides, sequence distribution has no obvious influence on its surface properties and properties. Meanwhile, the yields of degradation residues of the tricopolymers were significantly improved by the ceramic formation from POSS moieties during thermal decomposition. Copyright © 2016 John Wiley & Sons, Ltd.
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
Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 4
·3023-3034
·
IF 11.806
Xu Yaoyuan,Zhang Runze,Zhong Zhengxiang,Yang Ling
Sunlight is one of the most significant energy sources that we utilized in our daily life. Although it brings great benefits to us, due to the high energy of the ultraviolet part in sunlight, long time exposure to sunlight may cause severe problems to both humans and materials, such as skin cancer, material fatigue, and degradation. Also, the infrared part of the light can also lead to energy accumulation, heating the surface in an undesirable way. In order to ameliorate the ultraviolet shielding ability of thermochromic materials. In this paper, we synthesized a kind of novel film materials through coordinated self-assembly at room temperature in a very simple and green method. The material is mainly composed of two kinds of metal salts (Cr(NO 3 ) 3 ·9H 2 O and CuSO 4 ·5H 2 O) and octa-aminopropyl POSS, exhibiting great reversible thermochromic property from 20 to 80 ℃, superb UV shielding (100%) performance, and excellent infrared shielding (99%) ability. By increasing the ratio of CuSO 4 ·5H 2 O, the UV shielding effectiveness was enhanced and it achieved nearly 100% along with 99% IR shielding effectiveness at 780–1400 nm when the addition is 50%. The relevant mechanisms were illustrated by decomposition analysis through UV–Vis spectroscopy, in situ XPS, in situ XRD, FT-IR, TG-MS tests, and molecular simulations. These unique properties make this material very promising in various areas, such as new generation smart windows, functional coatings, and temperature sensors. Graphical abstract
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Xiaobo Yu,Jingli Ding,Yingjie He,Shunbo Wei,Xing Chen,Qiujie Luo,Yuqing Zhang,Chen Qian,Jiahui Wang,Mengjie Hu,Xiang Zhang,Cuifen Lu,Jinping Liu,Jianliang Zhou
Valvular heart disease (VHD) poses a thorny problem in cardiovascular diseases. The most effective treatment for VHD is heart valve replacement. Biological heart valve (BHV) is more favored than mechanical heart valve due to the maturity of transcatheter heart valve replacement (THVR) and the absence of the need for lifelong anticoagulant use. However, traditional commercial BHV suffers degeneration within 10 to 15 years because of calcification caused by the cross-linking reagent, glutaraldehyde. Considering the remarkable properties of POSS, PEG, and the star-like eight-arm structure, we fabricated POSS-PEG-PP, which is a decellularized porcine pericardium (DPP) crosslinked by a star-like eight-arm cross-linker octafunctionalized POSS of benzaldehyde-terminated polyethylene glycol (POSS-PEG-CHO) based on the Schiff's base reaction. POSS-PEG-PP exhibits more intense fiber arrangement and better mechanical properties than GLUT-PP (glutaraldehyde crosslinked DPP). The results also show that the cytocompatibility, endothelialization, and hemocompatibility of POSS-PEG-PP are outstanding in vitro. Subsequently, in vivo assessments demonstrate that POSS-PEG-PP has anti-inflammatory and anti-calcification abilities. Furthermore, RNA sequencing analysis of subcutaneous implants suggests that the intervention of AMPK and IL-17 signaling pathways plays an important role in the inflammatory and immune responses regulation of POSS-PEG-PP. Therefore, POSS-PEG-PP is an excellent substitute material for BHVs and is expected to be clinically transformed.
研究领域:
心血管疾病
·
生物材料科学
·
组织工程
✓ 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）