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Chinese Journal of Polymer Science 2014年第1期32卷 29-34页

作者： Huan Zhou Zheng-zhong Shao 陈新 State key laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Laboratory of Advanced Materials Fudan University

Ca（II） ions are added in the spinning dope to adjust the solidification rate of regenerated silk fibroin （RSF） solution during the wet-spinning process since Ca（II） ions are proved to be favorable to maintain the stable silk fibroin network in our previous work. The results show that when Ca（II）/RSF ratios are 1/50 and 1/20, the resulted RSF fibers exhibit good performance with the breaking energy more than 70 kJ/kg. However, higher Ca（II）/RSF ratio （for example, 1/10） hinders the solidification of spinning dope and results in poor RSF fibers. These observations together with earlier papers from this laboratory confirm that to produce tough silk fibers the spinning conditions must allow sufficient time for the adjustment of silk fibroin molecular chains.

关键词： Silk fiber Natural polymer Wet-spinning Protein Calcium.

Polymer-based ?exible bioelectronics

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Science Bulletin 2019年第9期64卷 634-640页

作者： Xiaoying Wu Huisheng Peng State key laboratory of Molecular Engineering of Polymers Department of Macromolecular Scienceand Laboratory of Advanced MaterialsFudan University

Due to the mechanical mismatch between conventional rigid electronic devices and soft tissues at nature,a lot of interests have been attracted to develop flexible bioelectronics that work well both in vitro and in vivo. To this end, polymers that can be used for both key components and substrates are indispensable to achieve high performances such as high sensitivity and long-term stability for sensing *** we will summarize the recent advances on the synthesis of a variety of polymers, the design of typical architectures and the integration of different functions for the flexible bioelectronic devices. The remaining challenges and promising directions are highlighted to provide inspirations for the future study on the emerging flexible bioelectronics at end.

关键词： Polymer Flexible Stretchable Multi-functional Bioelectronic device

PARTICLE-COLLISION AND POROGEN-LEACHING TECHNIQUE TO FABRICATE POLYMERIC POROUS SCAFFOLDS WITH MICROSCALE ROUGHNESS OF INTERIOR SURFACES

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Chinese Journal of Polymer Science 2013年第5期31卷 737-747页

作者： Zhen Pan Ze-hua Qu Zheng Zhang Rong Peng Ce Yan 丁建东 State key laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceLaboratory of Advanced MaterialsFudan University

A facile technique is herein reported to fabricate three-dimensional （3D） polymeric porous scaffolds with interior surfaces of a topographic microstructure favorable for cell adhesion. As demonstration, a well-known biodegradable polymer poly（lactide-co-glycolide）（PLGA） was employed as matrix. Under the porogen-leaching strategy, the large and soft porogens of paraffin were modified by colliding with small and hard salt particles, which generated micropits on the surfaces of paraffin spheres. The eventual PLGA scaffolds after leaching the modified porogens had thus interior surfaces of microscale roughness imprinted by those micropits. The microrough scaffolds were confirmed to benefit adhesion of bone marrow stromal cells （BMSCs） of rats and meanwhile not to hamper the proliferation and osteogenic differentiation of the cells. The insight and technique might be helpful for biomaterial designing in tissue engineering and regenerative medicine.

关键词： Tissue engineering Porous scaffolds Surface topography Cell adhesion Poly(lactide-co-glycolide) (PLGA).

One-step Production of Continuous Supercapacitor Fibers for a Flexible Power Textile

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Chinese Journal of Polymer Science 2019年第8期37卷 737-743页

作者： Yang Hong Xun-Liang Cheng Ge-Jun Liu Dong-Sheng Hong Si-Si He Bin-Jie Wang Xue-Mei Sun Hui-Sheng Peng State key laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University

Given that conventional bulky electrochemical energy storage devices are too rigid and heavy to be considered wearable,developing fully integrated power systems is expected to accelerate the successful commercialization of smart electronic *** great achievements have been made for fiber-shaped energy storage devices, there remain key challenges pertaining to their fabrication efficiency, scalability, and stability. Herein, a general and highly efficient method is developed to continuously fabricate supercapacitor fibers with lengths of kilometers at high production rate up to 118 m/h through a simple one-step wet spinning *** from the designed unique two-circle-in-one-circle architecture, the resulting supercapacitor fibers demonstrated high electrochemical stability even after being bended for 1 × 10~5 cycles. As a demonstration, these continuous supercapacitor fibers were further woven into a flexible power scarf for large-scale applications in wearable electronics. This simple and scalable fabrication process combined with the unique structure provides a general and effective paradigm to design other fiber-shaped devices like sensors, batteries,and solar cells.

关键词： Continuous production Wet-spinning Fiber-shaped supercapacitors Energy storage fabric

Assemblies of covalent organic framework microcrystals:multiple-dimensional manipulation for enhanced applications

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Science China Chemistry 2018年第2期61卷 143-152页

作者： Fuyu Yuan Jing Tan Jia Guo State key laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan University

Covalent organic frameworks (COFs) are well known as the next generation of shape-persistent zeolite analogues, which have brought new impetus to the development of porous organic materials as well as two-dimensional polymers. Since the advent of COFs in 2005, many striking findings have definitely proven their great potentials expanding applications across energy,environment and healthcare fields. With thorough exploration over a decade, research interest has been drawn on the scientific challenges on chemistry, while making full play of COF values has remained far from satisfactory yet. Thus opening an avenue to modulating COF assemblies on the multi-scale is no longer just an option, but a necessity for matching the application requirements with enhanced performances. In this mini-review, we summarize the recent progress on design of nanoscale COFs with varying forms. Detailed description is concentrated on the synthetic strategies of COF assemblies such as spheres, fibers,tubes, coatings and films, thereby shedding light on the flexible manipulation over dimensions, compositions and ***, the advanced applications of nanoscale COFs have been discussed here with comparison of their bulky counterparts.

关键词： covalent organic frameworks controllable synthesis porous materials nanoscale

Highly efficient and thermal stable guanidinium-based two-dimensional perovskite solar cells via partial substitution with hydrophobic ammonium

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Science China Chemistry 2019年第7期62卷 859-865页

作者： Yingzhu Zhang Jiehuan Chen Xiaomei Lian Weitao Yang Jun Li Shuoxun Tian Gang Wu Hongzheng Chen State key laboratory of Silicon Materials Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education)Department of Polymer Science and Engineering Zhejiang University

Layered two-dimensional(2D)perovskite solar cells(PVSCs)with a chemical formula of C(NH2)3(CH3NH3)3Pb3I10(n=3)have been fabricated through additive engineering,wherein stoichiometrically equivalent guanidinium(GA+)and methylammonium(MA+)serve as spacer *** crystallinity of the perovskite films is dramatically enhanced with proper amount of methylammonium thiocyanate(MASCN)added into the precursor *** addition,we substitute a small amount of MA+with hydrophobic phenylethylammonium(PEA+),which can passivate trap states of the perovskite *** a result,the open circuit voltage increases to 1.1 V and the best power conversion efficiency(PCE)of 10.12%is ***,superior thermal stability and balanced moisture stability of the PEA-substituted GA-based PVSCs are demonstrated,compared to the popular 3D MAPbI3and 2D PEA-based *** retain approximately 80%of the original PCE after 30 d at 20%relative humidity(RH),and 50%of the original PCE after 3200 min at 85°C without any *** work suggests a new route to achieve both heat and humidity stable PVSCs by simply mixing different spacer cations.

关键词： guanidinium-based 2D perovskite solar cells additive engineering PEA substitution stability

A Novel Chitosan-based Sponge Coated with Self-assembled Thrombin/Tannic Acid Multilayer Films as a Hemostatic Dressing

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Chinese Journal of Polymer Science 2015年第2期33卷 284-290页

作者： Xiao-fei Huang Jing-wei Jia 王征科胡巧玲 MOE key laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

In order to prepare a novel hemostatic dressing for uncontrolled hemorrhage, a porous chitosan sponge was coated with self-assembled（thrombin/tannic acid）n films, which were based on hydrogen bonding interactions between thrombin and tannic acid at physiologic p H. According to the whole blood clotting test, the coated chitosan sponges showed a significantly high rate of blood clotting due to the addition of thrombin. On the other hand, the storable half-life of immobilized thrombin is extended to 66.9 days at room temperature, which is 8.5 times longer than unfixed thrombin. It is because of the immobilization effect of, not only the porous structure of chitosan sponge but also the interactions between thrombin and tannic acid. In addition, the tannic acid has similar antibacterial effect to chitosan. Therefore, it is an excellent combination of chitosan, thrombin and tannic acid. Besides, all of materials in this research have been approved by the United States Food and Drug Administration（FDA）. So the chitosan-based sponge is a promising candidate dressing for uncontrolled hemorrhage due to its storable, bio-safe and highly effective hemostatic properties.

关键词： Chitosan Thrombin Tannic acid Layer-by-Layer assembly Hemostatic dressing

MULTILAYERS AND POLY(ALLYLAMINE HYDROCHLORIDE)-GRAFTPOLY(ETHYLENE GLYCOL) MODIFIED BOVINE SERUM ALBUMIN NANOPARTICLES:IMPROVED STABILITY AND pH-RESPONSIVE DRUG DELIVERY

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Chinese Journal of Polymer Science 2012年第5期30卷 719-726页

作者： Li-li Xie 仝维鋆 Jian-quan Xu Chang-you Gao MOE key laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

To improve the colloidal stability of bovine serum albumin （BSA） nanoparticles （hiPs） in diverse mediums, poly（allylamine hydrochloride）（PAH）/sodium poly（4-styrene sulfonate）（PSS） multilayers and poly（allylamine hydrochloride）-graft-poly（ethylene glycol）（PAH-g-PEG） coating were coated on the surface of BSA NPs. Stabilities of the BSA NPs in diverse mediums with different surfaces were detected by dynamic light scattering （DLS）. Multilayers and PAH-g-PEG coated BSA NPs can be well dispersed in various mediums with a narrow polydispersity index （PDI）. The BSA NPs with the highest surface density of PEG show the best stability. The multilayers and PAH-g-PEG coating do not deter the pH-dependent loading and release property of BSA NPs. At pH 9, the encapsulation efficiency of doxorubicin reaches almost 99%, and the release rate at pH 5.5 is significantly higher than that at pH 7.4.

关键词： BSA nanoparticle PEG LBL Drug delivery pH-responsive.

Effects of Nanosilica on Crystallization and Thermal Ageing Behaviors of Polyethylene Terephthalate

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Chinese Journal of Polymer Science 2015年第5期33卷 697-708页

作者： Ying-jie Xu 宋义虎 Qiang Zheng MOE key laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The effects of nanosilica（SiO2） on crystallization and thermal aging behaviors of polyethylene terephthalate（PET） have been studied using differential scanning calorimetry（DSC） and polarized optical microscopy（POM）, viscometry, tensile testing and scanning electron microscopy（SEM）. For non-isothermal and isothermal crystallizations, the crystallization rate of PET increases considerably with increasing content of SiO2 providing a large number of nucleation sites, but the relative crystallinity of the nanocomposites has little differences with that of neat PET. According to POM observation, the nucleation of PET becomes faster and the nucleation density increases significantly with increasing SiO2 content. For PET and its nanocomposites thermally aged at 190 ℃, the results of intrinsic viscosity, carboxyl content and tensile test show that the degradation rate of PET is reduced with the addition of a small content of SiO2, but the degradation rate increases with further addition of SiO2, owing to the dual effect of SiO2 on PET degradation.

关键词： Polyethylene terephthalate Nanosilica Crystallization Thermal ageing

A HYBRID SCAFFOLD OF POLY(LACTIDE-CO-GLYCOLIDE) SPONGE FILLED WITH FIBRIN GEL FOR CARTILAGE TISSUE ENGINEERING

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Chinese Journal of Polymer Science 2011年第2期29卷 233-240页

作者：高长有 MOE key laboratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The poly（lactide-co-glycolide）（PLGA） sponge fabricated by a gelatin porogen leaching method was filled with fibrin gel to obtain a hybrid scaffold for chondrocytes culture in *** fibrin gel evenly distributed in the hybrid scaffold with visible fibrinogen fibers after *** vitro culture it was found that in the hybrid scaffold the chondrocytes distributed more evenly and kept a round morphology as that in the normal *** the chondrocytes seeded in the control PLGA sponges showed similar proliferation behavior with that in the hybrid scaffolds,they were remarkably elongated,forming a fibroblast-like ***,a larger amount of glycosaminoglycans was secreted in the hybrid scaffolds than that in the PLGA sponges after in vitro culture of chondrocytes for 4 *** results suggest that the fibrin/PLGA hybrid scaffold may be favorably applied for cartilage tissue engineering.

关键词： Cartilage tissue engineering PLGA sponge Fibrin gel Chondrocytes