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T-shaped trifunctional crosslinker-toughening hydrogels

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Science China(Technological Sciences) 2020年第9期63卷 1721-1729页

作者： Ll QingYu XU Ziyang ZHANG DongFei yang jianhai LIU WenGuang School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300350China

Currently, development of a single network hydrogel with a high fracture toughness in swelling equilibrium remains *** this work, a novel T-shaped trifunctional crosslinker(T-NAGAX) with dual vinyl on the backbone and dual amide group on the side chain is synthesized by Michael addition and acylation. The T-NAGAX is used to prepare chemically crosslinked hydrogel by one-pot photo-initiated polymerization. The resulting single network hydrogels of representative polyacrylamide(PAAm), poly(N-acryloyl 2-glycine)(PACG), and poly(N-isopropyl acrylamide)(PNIPAM) crosslinked with T-NAGAX with additional hydrogen-bonds exhibit much better fracture toughness than that of the corresponding hydrogels crosslinked by N,N'-methylene bisacrylamide, a conventional crosslinker;higher mechanical strengths are observed in the T-NAGAX crosslinked hydrogels. These hydrogels are promising to be exploited as load-bearing soft tissue substitutes. This T-NAGAX crosslinker can be expanded to toughen various types of hydrogels.

关键词： single network hydrogen bond hydrogel toughness crosslinker

A high strength, anti-fouling, self-healable, and thermoplastic supramolecular polymer hydrogel with low fibrotic response

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Science China(Technological Sciences) 2019年第4期62卷 569-577页

作者： WANG HongBo LI HaoFei WU YuanHao yang jianhai LIU WenGuang School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin University

The fibrotic response plays an important role in the performance and longevity of implantable devices. Thus, development of effective anti-inflammatory and anti-fibrosis biomaterial implants has become an urgent task. In this work, we developed a novel supramolecular polymer hydrogel through the copolymerization of N-acryloyl glycinamide(NAGA) and carboxybetaine acrylamide(CBAA) in the absence of any chemical crosslinker, which the mechanical properties being tunable through changing the monomer concentration and the monomer ratio over a broad scope. The hydrogel possessed the superior mechanical performances: high tensile strength(～1.13 MPa), large stretchability(～1200%), and excellent compressive strength(～9 MPa) at high monomer concentration and NAGA/CBAA ratio. Introduction of CBAA could promote the self-healability, thermoplasticity of suparmolecular polymer hydrogels at lower temperatures, meanwhile dramatically improving anti-fouling *** analysis and in vitro cytotoxicity assays testified the excellent biocompatibility of the hydrogel. This high strength supramolecular polymer hydrogel with integrated multiple functions holds promising potentials as a scaffold biomaterial for treating degenerated soft supporting tissues.

关键词： supramolecular polymer hydrogel self-healing anti-protein absorption fibrotic response

A hyperbranched polymer-based water-resistant adhesive:Durable underwater adhesion and primer for anchoring anti-fouling hydrogel coating

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Science China(Technological Sciences) 2022年第1期65卷 201-213页

作者： ZHANG YaHan CUI ChunYan SUN YaGe ZHANG XiaoPing yang Rong yang jianhai XIE Fei LIU WenGuang School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Shandong Zhushi Pharmaceutical Group Co. Lid.Heze 274300China

Direct deployment of gluing and achieving durable robust adhesion in water is challenging due to difficulty in repelling interface *** work reports a novel hyperbranched polymer-based water-resistant adhesive(HBPBA)based on Michael addition reaction of multi-vinyl monomers with dopamine and 3-aminophenylboronic *** encountering water,the HBPBA forms coacervates whose hydrophobic chains aggregate to displace interface water,and meanwhile the catechols exposing outwards contribute to underwater *** HBPBA can strongly glue diverse substrates including PTFE,PE,PET,ceramic,Ti and stainless *** HBPBA can maintain stable adhesion in different environments,such as tap water,simulated sea water,PBS,and a wide range of pH solutions(pH 2 to 10)for 3 months,supposedly due to the complexation of catechol with boronic ***,HBPBA film can be bonded to the titanium surface as a primer,which firmly anchors the antifouling PNAGAPCBAA hydrogel coating through copolymerization of remaining double bonds in HBPBA and NAGA plus *** PNAGA-PCBAA hydrogel-modified titanium is biocompatible and shows outstanding antifouling ability both in vitro and in *** work proposes a new strategy for creating underwater deployable and water-resistant adhesives that may find promising applications in engineering and biomedical fields.

关键词： hyperbranched polymer adhesive anti-fouling hydrogel underwater adhesion

An in situ-forming polyzwitterion hydrogel: Towards vitreous substitute application

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Bioactive Materials 2021年第10期6卷 3085-3096页

作者： Binbin He jianhai yang yang Liu Xianhua Xie Huijie Hao Xiaoli Xing Wenguang Liu School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China Tianjin International Joint Research and Development Centre of Ophthalmology and Vision Science Eye Institute and School of OptometryTianjin Medical University Eye HospitalTianjin300384China

Development of a biostable and biosafe vitreous substitute is highly desirable,but remains a grand ***,we propose a novel strategy for constructing a readily administered vitreous substitute based on a thiol-acrylate clickable polyzwitterion macromonomer.A biocompatible multivinyl polycarboxybetaine(PCB-OAA)macromonomer is designed and synthesized,and mixed with dithiothreitol(DTT)via a Michael addition reaction to form a hydrogel in vitreous *** resultant PCB-OAA hydrogel exhibits controllable gelation time,super anti-fouling ability against proteins and cells,excellent biocompatibility,and approximate key parameters to human vitreous body including equilibrium water content,density,optical properties,***,outperforming clinically used silicone oil in biocompatibility,this rapidly formed hydrogel in the vitreous cavity of rabbit eyes remains stable in vitreous cavity,showing an appealing ability to prevent significantly inflammatory response,fibrosis and complications such as raised intraocular pressure(IOP),and cataract *** zwitterionic polymer hydrogel holds great potential as a vitreous substitute.

关键词： Zwitterion Hydrogel Anti-fouling Vitreous substitute

冲击与回应:数字经济时代城乡居民养老保险的适应性改革

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吉首大学学报（社会科学版） 2024年第4期45卷 95-104页

作者：杨建海北京工商大学经济学院北京100048

数字经济带来就业方式的变革与新就业形态的出现。这一变革促使就业便利的同时,也对社会养老保险的参保造成严重冲击:一是劳动的非标准化带来参保障碍,二是就业不稳定带来收入的波动从而降低了参保缴费能力,多数新业态从业人员不得不选... 详细信息

数字经济带来就业方式的变革与新就业形态的出现。这一变革促使就业便利的同时,也对社会养老保险的参保造成严重冲击:一是劳动的非标准化带来参保障碍,二是就业不稳定带来收入的波动从而降低了参保缴费能力,多数新业态从业人员不得不选择在原籍参加城乡居民养老保险。城乡居民养老保险自身也存在基础养老金待遇标准偏低和个人账户养老金缴费激励不足等问题。制度自身的“内忧”与新业态冲击的“外患”,使得城乡居民养老保险制度亟需进行适应性改革———在分离基础养老金和个人账户养老金的基础上,将基础养老金升级为普惠性非缴费型养老金,对个人账户养老金的缴费激励进行优化,确保制度能够实现政策目标,进而推动我国多层次、多支柱养老保障体系的建设。

关键词：数字经济城乡居保适应性改革非缴费型养老金个人养老金

Key Points of Ridge Cultivation of Lane Late Navel Orange

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Asian Agricultural Research 2019年第5期11卷 76-78页

作者： Zhiwei ZENG Ronghai yang Long ZHOU Ming SHEN jianhai yang Qingxiong yang Jixu FAN Derong yang Yunnan Yuntianhua Co. Ltd.Kunming650228China Yunnan Hengguan Taida Agricultural Development Co. Ltd.Kunming651700China Yunnan Agricultural University Kunming650201China Yunnan Chemical Research Institute Kunming650228China

Ridge cultivation can effectively enhance soil permeability,promote root development and improve fruit quality. Based on the characteristics of Lane Late navel orange,this paper summarizes the technical points related to ridge cultivation and compares the effects of ridge cultivation and conventional cultivation on the growth,so as to provide guidance for better production practices.

关键词： Lane Late navel orange Ridge cultivation Conventional cultivation

广东:稳步推进农村和被征地农民养老保障工作

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中国劳动 2007年第2期 17-18页

作者：杨健海广东省劳动保障厅

2006年，在中央和全省农村工作会议和加快新农村建设决定精神的指引下，广东省委省政府高度重视农村社会保障制度建设，各有关部门共同努力，以建立被征地农民的养老保障制度为突破口，积极、稳妥地推进各项工作，统筹城乡社会保障事业... 详细信息

2006年，在中央和全省农村工作会议和加快新农村建设决定精神的指引下，广东省委省政府高度重视农村社会保障制度建设，各有关部门共同努力，以建立被征地农民的养老保障制度为突破口，积极、稳妥地推进各项工作，统筹城乡社会保障事业发展取得新进展。据初步统计，全省近300万被征地农民，已有130多万人被纳入农民与被征地农民养老保障制度。目前，全省正在以试点带动，全面稳步推进被征地农民养老保障制度建设。

关键词：农民养老保障被征地农民新农村建设稳步推进广东省保障工作社会保障制度建设养老保障制度

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论“孝”的起源、演变及其当代转化

华中农业大学学报（社会科学版） 2017年第1期 134-139页

作者：杨建海北京工商大学经济学院北京100048

"孝"是中国文化最显著的特征。以"孝"的历史变迁为纵轴,以不同时代的社会结构为横轴,全面分析了"孝"的起源、演变及其当代转化。自殷商的祖宗崇拜产生"孝"为始,经周代为利于宗法统治而将祖先崇拜向人伦秩序转化,到孔子把"孝"与"敬"、"养... 详细信息

"孝"是中国文化最显著的特征。以"孝"的历史变迁为纵轴,以不同时代的社会结构为横轴,全面分析了"孝"的起源、演变及其当代转化。自殷商的祖宗崇拜产生"孝"为始,经周代为利于宗法统治而将祖先崇拜向人伦秩序转化,到孔子把"孝"与"敬"、"养"、"礼"结合起来,才完成孝道的伦理构建。后经汉代"移孝作忠"的发展,"孝"的含义不断得到扩展,由调整自然亲情的伦理秩序转变为具有政治教化和宗教信仰等多种功能的普遍道德。此后一直到清末民初皆为历代统治者所推崇和民间所认同。历史上发挥巨大作用的"孝",在面对现代社会变迁的冲击之时,也不得不顺应时代变化而发生转化。提出孝道伦理应顺应时代变迁的要求,由原来适应家族主义的传统孝道转变为适应个人主义社会的现代孝道。

关键词：孝起源演变转化

焊前混合表面纳米化对2A14铝合金搅拌摩擦焊接头微观组织和力学性能的影响

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金属学报 2017年第7期53卷 842-850页

作者：杨建海张玉祥葛利玲程晓陈家照高杨火箭军工程大学西安710025 西安理工大学材料科学与工程学院西安710048 中国航天科技集团长征机械厂成都610100

采用超音速微粒轰击(SFPB)和表面机械滚压处理(SMRT)相结合的混合表面纳米化(HSNC)方法在2A14铝合金表面制备出梯度纳米结构(GNS)表层,之后进行了搅拌摩擦焊(FSW)。利用OM、SEM和TEM对比研究了HSNC样品和原始样品FSW焊缝的微观组织和断... 详细信息

采用超音速微粒轰击(SFPB)和表面机械滚压处理(SMRT)相结合的混合表面纳米化(HSNC)方法在2A14铝合金表面制备出梯度纳米结构(GNS)表层,之后进行了搅拌摩擦焊(FSW)。利用OM、SEM和TEM对比研究了HSNC样品和原始样品FSW焊缝的微观组织和断裂形貌。结果表明,GNS表层以类似"S"线复杂形式分布在HSNC样品的热机影响区(TMAZ)和焊核区(NZ)中,形成了纳米层区(NLZ);原始样品显微硬度最低处和断裂位置均发生在前进侧的TMAZ,HSNC样品显微硬度最低处和断裂位置均发生在NZ;HSNC样品的抗拉强度比原始样品提高了6.4%,延伸率比原始样品提高了14.1%,两者的断裂方式均为韧性断裂,但原始样品断口形貌为非等轴韧窝和撕裂韧窝,HSNC样品断口形貌为等轴韧窝。分析表明,由于纳米晶的优异性能,NLZ在提高焊缝强度的同时提高了塑性变形能力。

关键词：铝合金混合表面纳米化搅拌摩擦焊显微组织力学性能