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Delivery of surface-mediated non-viral gene nanoparticles from ultrathin layer-by-layer multilayers

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Science china Chemistry 2010年第3期53卷 508-513页

作者： WANG XueFei,REN KeFeng,LIN QuanKui & JI Jian key laboratory of macromolecule synthesis and functionalization,ministry of education Department of Polymer Science and Engineering,zhejiang university,hangzhou 310027,china key laboratory of macromolecule synthesis and functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou China

An efficient and safe gene delivery system remains a challenge in the development of gene ***-based gene nanoparticles are a typical non-viral gene delivery system,which are able to transfect cells in vitro and in *** paper reported a facile method for constructing biodegradable multilayers via layer-by-layer self-assembly,in which the polycation-based gene nanoparticles were *** this surface-mediated delivery system,adherent cells on the multilayer could be transfected in *** nanoparticles-loaded multilayers transfect cells with higher efficiency than naked DNA-loaded multilayers because of the complex configuration of the *** nanoparticles/PGA multilayers constructed on the scaffold surface could also realize in situ transfection on the adherent *** well-structured,easy-processed multilayers may provide a novel approach to precisely controlled delivery of gene nanoparticles,which may have potential applications for gene therapy in tissue engineering and medical implants.

关键词： DNA nanoparticles layer-by-layer self-assembly biodegradability in situ transfection poly(lactic acid) scaffold

Thermo-responsive stick-slip behavior of advancing water contact angle on the surfaces of poly(N-isopropylacrylamide)-grafted polypropylene membranes

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Science china Chemistry 2010年第1期53卷 183-189,289页

作者： WAN LingShu,MENG XiangLin,YANG YunFeng,TIAN Jing & XU ZhiKang key laboratory of Macromolecular synthesis and functionalization,ministry of education Department of Polymer Science and Engineering,zhejiang university,hangzhou 310027,china key laboratory of Macromolecular synthesis and functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou China

Wettability of a solid surface is highly important to its practical application,especially for the surface that shows thermoresponsive *** this paper,we describe a thermo-responsive stick-slip behavior of water droplets on the surfaces of poly(N-isopropylacrylamide)(PNIPAM)-grafted polypropylene *** emission scanning electron microscope(FESEM) images elucidate that the morphology of PNIPAM-grafted membrane surface is thermo-responsive,i.e.,the surface becomes rougher above the lower critical solution temperature(LCST) of *** the surface of nascent polypropylene membranes,the water droplet shows a smooth motion resulting in advancing and receding water contact angles of 111° and ～65°,*** the PNIPAM-grafted membrane surfaces,the water droplet shows a stick-slip pattern above the LCST,whereas it advances smoothly below the *** phenomenon is reproducible and can be ascribed to the energy barriers enhanced by the shrink of PNIPAM chains above the *** also find that the slip contact angle decreases from 102° to 92° after several stick-slip *** decrease is attributed to the water adsorption on the grafted PNIPAM layer,which is confirmed by the continuous decrease of the receding water contact angle.

关键词： stick-slip behavior water contact angle thermo-responsive surface poly(N-isopropylacrylamide) polypropylene membrane

synthesis,structure and catalytic activity of complexes [Ln(EDBP)_2(DME)Na(DME)_3](Ln=Er,Yb,Sm) for ring-opening polymerization of ε-caprolactone

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Science china Chemistry 2009年第10期52卷 1711-1714页

作者： YU JianFang, WU GuangMing, HUANG Jing, SUN WeiLin & SHEN ZhiQuan key laboratory of Macromolecular synthesis and functionalization, ministry of education, Department of Polymer Science and Engineering, zhejiang university, hangzhou 310027, china key laboratory of Macromolecular synthesis and functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou China

Discrete ion-pair complexes [Ln(EDBP)2(DME)Na(DME)3] [Ln=Er (1), Yb (2), Sm (3)] have been synthesized by the reaction between sodium salt of 2,2'-ethylidene-bis(4,6-di-tert-butylphenol)(EDBPH2) and Ln(BH4)3·3THF (Ln=Er, Yb, Sm) followed by centrifugation and recrystalization. The complexes were characterized by elemental analysis and FT-IR, and the bonding model of these compounds was confirmed by X-ray single crystal diffraction for complex 1. It was found that four O atoms in two biphenol ligands as well as two O atoms in one ethylene glycol dimethyl ether (DME) molecule connect to the center rare earth metal atom, while sodium exists as counterpart cation to balance the charge. Complexes 1―3 can all be used as single component initiators for the ring-opening polymerization of ε-caprolactone.

关键词： ring-opening polymerization ε-caprolactone X-ray single crystal biphenol

Correlation between rheological behavior and structure of multi-component polymer systems

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Science china Chemistry 2008年第1期51卷 1-12页

作者： ZUO Min1,2 ZHENG Qiang1 1 key laboratory of Macromolecular synthesis and functionalization, ministry of education, Department of Polymer Science and Engineering, zhejiang university, hangzhou 310027, china 2 Department of Chemical Engineering, Hong Kong university of Science and Technology, Clear Bay, Kowloon, Hong Kong key laboratory of Macromolecular synthesis and functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou China Department of Chemical Engineering Hong Kong University of Science and Technology Kowloon China

Rheological measurement has been an effective method to characterize the structure and properties for multiphase/multi-component polymers, owing to its sensitivity to the structure change of hetero- geneous systems. In this article, recent progress in the studies on the morphology/structure and rheological properties of heterogeneous systems is summarized, mainly reporting the findings of the authors and their collaborators, involving the correlation between the morphology and viscoelastic relaxation of LCST-type polymer blends, the microstructure and linear/nonlinear viscoelastic behavior of block copolymers, time scaling of shear-induced crystallization and rheological response of poly- olefins, and the relationship between the structure/properties and rheological behavior of filled polymer blends. It is suggested that a thorough understanding of the characteristic rheological response to the morphology/structure evolution of multiphase/multi-component polymers facilitates researchers’ op- timizing the morphology/structure and ultimate mechanical properties of polymer materials.

关键词： heterogeneous polymer systems morphology and structure rheological properties viscoelastic relaxation

Analyse and Criticism on the Falsehood of Current Polymer education and Teaching in china

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Analyse and Criticism on the Falsehood of Current Polymer Ed...

“Click”Polymerization

2007年全国高分子学术论文报告会

作者： Qiang ZHENG Department of Polymer Science and Engineering,zhejiang university key laboratory of Macromolecular synthesis and functionalization(zhejiang university),ministry of education,hangzhou 310027,P.R.china

＜正＞At present,there seems no distinct improvement in the quality of personnel training and education,although the investment of education from the government and the attention from the society increase *** the basi... 详细信息

关键词： Polymer education Teaching Analyse Criticism of Falsehood Personnel Training education of Polymer Profession

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“Click”Polymerization

Functionalized polymer nanofibers by electrospinning

2009年全国高分子学术论文报告会

作者： Anjun Qin and Ben Zhong Tang Department of Chemistry,The Hong Kong university of Science & Technology,Clear Water Bay, Kowloon,Hong Kong,china,and key laboratory of Macromolecular synthesis and functionalization of the ministry of education,Department of Polymer Science and Engineering, zhejiang university,hangzhou 310027,china

＜正＞Alkyne-azide"click"reaction is a powerful synthetic tool and has been found wide spread applications in the areas of chemical,biological and materials *** reaction has also been employed by polymer scientists but the efforts have been mainly in polymer reactions for the modifications of preformed *** this work,we aim at developing the click reaction into a

关键词： Polymer synthesis Regioregularity Functional Polymers Polytriazoles Hyperbranched Polymers

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Functionalized polymer nanofibers by electrospinning

3D打印TPU软材料工艺参数对层间粘接的影响

5th International Symposium on High-Tech Polymer Materials

作者： Yuan-Yuan Lv Jian Wu Department of Chemistry Bei-Bei Ke Ling-Shu Wan Zhen-Mei Liu Zhi-Kang Xu Institute of Polymer Science and key laboratory of Macromolecular synthesis and functionalization (ministry of education)zhejiang university 310027 hangzhou

＜正＞Electrospinning is a useful method to prepare non-woven fabrics of sub-micron or nano-scale fibers,which have high porosity,large surface area-to,volume ratio,small pore size between depositing fibers of the ele...

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高分子学报 2018年第4期28卷 532-540页

作者：朱彦博杜淼陆超华尹俊郑强浙江大学高分子科学与工程学系高分子合成与功能构造教育部重点实验室浙江大学机械工程学院杭州310027

将热塑性聚氨酯弹性体(TPU)软材料通过挤出机制成线料,并用改进的基于熔融沉积原理(FDM)的3D打印机进行打印,考察了打印参数对打印物形貌及层间粘接强度的影响.研究发现,软硬段含量适宜的TPU弹性体软材料可用于FDM模式3D打印,打印层高... 详细信息

将热塑性聚氨酯弹性体(TPU)软材料通过挤出机制成线料,并用改进的基于熔融沉积原理(FDM)的3D打印机进行打印,考察了打印参数对打印物形貌及层间粘接强度的影响.研究发现,软硬段含量适宜的TPU弹性体软材料可用于FDM模式3D打印,打印层高对打印物的形貌影响较大,层高较大时,层间粘接面积小,打印物易发生变形;层高较小时,层间粘接面积大,打印物层与层之间出现挤压变形.同等条件下,TPU软材料3D打印物层间粘接强度为模压样品的70%左右,而硬质材料ABS的3D打印物层间粘接强度仅为模压样品的48%.研究还发现,层高设置及热台温度对打印物层间粘接强度影响较大,而打印速度和打印温度对样条层间粘接强度影响较小.采用TPU弹性体软材料打印的试样具有良好的回弹性,可弯折,试样外轮廓尺寸误差在1.65%以内.

关键词： 3D打印熔融沉积法 TPU软材料层间粘接强度

氟代位置对苝酰亚胺聚集态结构和电子传输性能的影响

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化学学报 2007年第11期65卷 1051-1056页

作者：黄嘉驰杨立功莫雄施敏敏汪茫陈红征浙江大学高分子科学与工程学系教育部高分子合成与功能构造重点实验室杭州310027

合成了三种新型的有机电子受体:N,N'-二(2-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D2MFPP)、N,N'-二(3-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D3MFPP)和N,N'-二(4-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D4MFPP).利用元素分析、傅立叶变... 详细信息

合成了三种新型的有机电子受体:N,N'-二(2-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D2MFPP)、N,N'-二(3-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D3MFPP)和N,N'-二(4-氟代苯基)-3,4,9,10-苝四羧基二酰亚胺(D4MFPP).利用元素分析、傅立叶变换红外(FTIR)等方法表征了它们的分子结构,用紫外-可见光吸收光谱(UV-Vis)、X射线衍射(XRD)和原子力显微镜(AFM)等手段研究了氟代位置对苝酰亚胺薄膜聚集态结构的影响,发现氟代使苝酰亚胺的聚集态发生变化,且不同位置的氟代对其影响也不一样.除了分子结构的影响,外场条件也会产生很大的作用.通过制备场效应晶体管研究了其电子传输性能,发现氟代后器件的空气稳定性有明显提高.

关键词：氟代苝酰亚胺聚集态结构电子传输