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Preparation Technology of Solvent-free Polyurethane:A Mini-Review

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Chinese Journal of Structural Chemistry 2020年第12期39卷 2057-2067,2053页

作者： su yu-miao WANG Ting DING yu-Lin HUANG Jia-Jing LI Wen-Mu Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of Chinese Academy of Sciences Beijing 100049China Fujian Normal University College of Chemistiy and Material ScienceFuzhou 350007China Provincial Key Laboratory of Eco-Industrial Green Technology Wuyi University 354300China

Solvent-free polyurethanes are synthesized under certain conditions via a rapid reaction between liquid *** this process the molecular weight of the polymer is rapidly increased to produce polymeric materials containing a carbamate-based structure at a very fast *** organic solvents are completely avoided in the solvent-free polyurethane synthesis process,thus avoiding all the problems associated with the use of organic ***-free polyurethane synthetic leather is extruded directly without adding solvents in the production and processing process,which has the advantages of low VOC emission and environmentally *** review brings together theoretical and experimental research on the application and synthesis and preparation of solvent-free polyurethanes to generate an understanding of the theory and synthesis and preparation techniques associated with solvent-free *** review includes(i)the application and development direction of solvent-free polyurethane,(ii)an overview of the technology of solvent-free polyurethane synthetic leather preparation,(iii)a study of the modification and synthesis of solvent-free polyurethane prepolymers,(iv)a summary of the technology of rapid foam forming of solvent-free polyurethane and its influencing factors,(v)a review of the technology of solvent-free polyurethane synthetic leather *** addition to the review,a corresponding overview of the theoretical and experimental advances in solvent-free delayed foaming technology in recent years and a summary of the technology and experience in the preparation of solvent-free polyurethanes are also presented.

关键词： solvent-free polyurethane polyurethane synthetic leather rapid foaming molding delayed catalyst

Aramid Nanofiber Composite Conductive Film Prepared via a Simple Mothed

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Chinese Journal of Structural Chemistry 2021年第10期40卷 1357-1364页

作者： HUANG Jia-Jing WANG Ting suyu-miao TU Chao-Yang LI Wen-Mu College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002.China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

It is very hard to obtain uniformly dispersed conductive polymer nanocomposites because of the accumulation tendency of *** current work,the aramid nanofiber/silver nanowire composite film was prepared by mixing evenly through the solution and then vacuum *** composite film exhibited desirable physical properties such as high tensile strength (121 MPa),outstanding electrical conductivity (652 S·cm^(-1)),and thermal conductivity (0.12 W·m^(-1)·K^(-1)).These endow our aramid nanofiber/silver nanowire composite film with possible applications in infrared stealth and harsh environments.

关键词： polymer nanocomposites aramid nanofiber silver nanowire

Blood pressure variability and baroreflex sensitivity are not different in spontaneously hypertensive rats and stroke-prone spontaneously hypertensive rats

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Acta Pharmacologica Sinica 2005年第8期26卷 959-962页

作者： Lin-shu ZHAN, yun-feng GUAN, Ding-feng su, Chao-yu miao~2 Department of Pharmacology, Second Military Medical University, Shanghai 200433, China Department of Pharmacology Second Military Medical University Shanghai 200433 China

Aim: To demonstrate and compare hemodynamic phenotypes of blood pressure (BP), blood pressure variability (BPV) and baroreflex sensitivity (BRS) in genetic hypertensive rats. Methods: BP was recorded continuously in conscious, freely moving rats using a computerized technique. BPV was expressed as the standarddeviation of beat-to-beat BP values during a 1-h period. BRS was determined by measuring the heart period prolongation in response to the elevation in BP pro-duced by an intravenous injection of phenylephrine. Results: Body weight and heart period were not different between spontaneously hypertensive rats (SHR) and stroke-prone spontaneously hypertensive rats (SHR-SP) at the age of 15 weeks. The BP level was markedly higher in SHR-SP than SHR, whereas there were no significant differences in BPV and BRS. Quantitatively, systolic, diastolic and mean BP were significantly elevated by 36.9%, 42.9% and 39.5%, respectively, in SHR-SP compared with SHR (P0.05). Conclusion: BPV and BRS were not changed in parallel with the BP alterations in SHR and SHR-SP.

关键词： blood pressure variability baroreflex hypertension genetics

Hypertonic and isotonic potassium solutions have different effects on vessel contractility resulting in differences in optimal resting tension in rat aorta

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Acta Pharmacologica Sinica 2007年第5期28卷 643-650页

作者： yun-feng GUAN Ruo-hua CHEN Pei WANG Ye QIN Ding-feng su Chao-yu miao Department of Pharmacology,Second Military Medical University,Shanghai 200433,China DepartmentofPharmacology SecondMilitaryMedicalUniversityShanghai200433China

Aim:To compare high K~+-induced contraction and optimal resting tension mea-sured by two commonly used techniques of hypertonic and isotonic K~+ in aortaswith and without adventitial fat from various age ***:Three age groupsof rats (15,25,and 62 weeks) were used to prepare thoracic aortic rings in whichadventitial fat was either removed or left *** K~+ (30 mmol/L)-inducedcontractions were observed under increasing resting tensions of 1.0,1.5,2.0,2.5,3.0,and 3.5 *** resting tension was the resting tension at which the aortashowed a maximal ***:The contractions induced by 2 kinds ofhigh K~+ were significantly *** and isotonic K~+ induced a differ-ent style of contraction,and the pattern varied with different *** the age of15 weeks,isotonic K~+-induced contractions were greater than hypertonic K~+-in-duced ***,at the age of 62 weeks,isotonic K~+-induced con-tractions were smaller than hypertonic K~+-induced *** restingtensions measured by 2 kinds of high K~+ were *** restingtensions in different kinds of aortic preparations from various age rats were almosta constant of 2 g,determined by isotonic K~+,but a variable,determined by hyper-tonic K~+.The adventitial fat could delay the development of high K~+-inducedcontractions at different resting tensions,but had little effect on the ***:Hypertonic and isotonic K~+ may produce differentcontractions resulting in differences in optimal resting tension in rat aorta.

关键词： potassium osmolarity contraction aorta fat

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土壤环境质量基准中Cd限量指标的推算

福建农林大学学报（自然科学版） 2006年第6期35卷 644-647页

作者：高树芳王果苏苗育罗丹福建农林大学资源与环境学院福建福州350002

以采自福建省主要城市郊区耕地表层土壤和相应蔬菜可食用部分Cd含量的数据为依据,提出一种土壤环境质量基准中有害元素限量指标的推算方法.整个推算过程包括指标类型选择、高风险指示作物确定和限量推算3个步骤.与土壤Cd全量相比,二乙... 详细信息

以采自福建省主要城市郊区耕地表层土壤和相应蔬菜可食用部分Cd含量的数据为依据,提出一种土壤环境质量基准中有害元素限量指标的推算方法.整个推算过程包括指标类型选择、高风险指示作物确定和限量推算3个步骤.与土壤Cd全量相比,二乙三胺五乙酸(DTPA)-CaC l2-三乙醇胺(TEA)提取的有效Cd能更好地预测土壤Cd的生物有效性,因此选择DTPA提取的土壤有效Cd作为土壤Cd的指标类型.在15种供试蔬菜中,空心菜可食用部分对土壤Cd的富集能力最强,同时又是本区域消耗量最大的蔬菜之一,因此将其定为高风险指示作物.根据空心菜含Cd量与土壤有效Cd含量之间的回归方程推算出来的土壤有效Cd的限量为0.1 ***-1.通过土壤有效Cd与全Cd之间的回归方程可推算出相应的全Cd限量为0.6 ***-1.

关键词： Cd 土壤环境质量基准限量

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创新补贴、税收优惠与高新技术产业研发产出

北京邮电大学学报（社会科学版） 2019年第6期21卷 77-89页

作者：彭若弘苏玉苗北京邮电大学经济管理学院

论文探讨了政府的研发补贴、专利、知识产权补贴、成果转化补贴以及税收优惠等各种政策对高新技术企业创新产出的作用机制,并通过分样本研究深入分析各项补贴作用的差异性。结果表明,各项补贴的激励效果不仅在企业不同阶段的研发产出间... 详细信息

论文探讨了政府的研发补贴、专利、知识产权补贴、成果转化补贴以及税收优惠等各种政策对高新技术企业创新产出的作用机制,并通过分样本研究深入分析各项补贴作用的差异性。结果表明,各项补贴的激励效果不仅在企业不同阶段的研发产出间不同,在不同产权性质、不同规模、不同行业的高新技术企业间亦存在差异。因此要提高政府研发补助的效果:一是要坚持对研发补助的精细化管理,依据补助目的灵活运用各项补助政策;二是政府仍需优化资源配置,针对不同产权性质、不同规模、不同产业的企业实施差异化的补助策略,最大限度发挥各项补助资源对企业研发产出的激励作用。

关键词：创新补贴税收优惠创新产出产业政策

田菁茎瘤固氮根瘤菌对穿心莲植株生长和有效成分含量的影响

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中药材 2019年第12期42卷 2746-2750页

作者：刘潇晗杜勤石志棉苏雨苗广州中医药大学中药学院广东广州510006

目的:研究田菁茎瘤固氮根瘤菌对不施肥条件下穿心莲植株生长及其有效成分含量的影响。方法:用对数期的田菁茎瘤固氮根瘤菌菌液浇灌萌发结束的穿心莲幼苗,对照组用无菌水代替;第100天,对开花株数进行计数;测量其株高、叶片数、分枝数;采... 详细信息

目的:研究田菁茎瘤固氮根瘤菌对不施肥条件下穿心莲植株生长及其有效成分含量的影响。方法:用对数期的田菁茎瘤固氮根瘤菌菌液浇灌萌发结束的穿心莲幼苗,对照组用无菌水代替;第100天,对开花株数进行计数;测量其株高、叶片数、分枝数;采收穿心莲植株,测量其根长、地上部分和地下部分的鲜重和干重,每个处理组分为根、茎、叶和地上部分,测定其有效成分(穿心莲内酯和脱水穿心莲内酯)含量。结果:田菁茎瘤固氮根瘤菌处理后,10~7个/mL浓度处理组对穿心莲植株生长和有效成分积累的促进效果最明显;该处理组开花株数是对照组的3.5倍;株高、分枝数、叶片数分别较对照组提高13.40%、16.75%、57.73%;地上部分鲜重、地上部分干重分别较对照组提高60.80%、67.08%;地下部分鲜重、地下部分干重分别较对照组提高24.40%、14.75%;地上部分穿心莲内酯和脱水穿心莲内酯的总量较对照组提高16.16%。结论:田菁茎瘤固氮根瘤菌处理可促进穿心莲植株的生长并提高穿心莲有效成分含量。

关键词：田菁茎瘤固氮根瘤菌穿心莲促进生长有效成分

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土壤Zn向白菜茎叶的转移能力

福建农林大学学报（自然科学版） 2005年第1期34卷 135-136页

作者：王果苏苗育陈炎辉林芬芳罗丹福建农林大学资源与环境学院福建福州350002

研究了采自福建不同地区的 26个土壤的Zn向白菜茎叶的转移能力.结果表明,虽然用DTPA提取的有效Zn与茎叶Zn含量之间无显著相关,但以DTPA有效Zn为基础的Zn转移系数与土壤有效Zn之间呈极显著的幂函数相关,这种幂函数相关将白菜茎叶Zn含量... 详细信息

研究了采自福建不同地区的 26个土壤的Zn向白菜茎叶的转移能力.结果表明,虽然用DTPA提取的有效Zn与茎叶Zn含量之间无显著相关,但以DTPA有效Zn为基础的Zn转移系数与土壤有效Zn之间呈极显著的幂函数相关,这种幂函数相关将白菜茎叶Zn含量与土壤有效Zn联系起来.在土壤Zn与作物Zn含量无显著相关的情况下,可用Zn转移系数(DTPA基)与土壤有效Zn之间的幂函数关系估计土壤Zn的环境质量限量.

关键词：土壤茎叶白菜 n含量作物幂函数环境质量 DTPA 转移能力转移系数

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14种蔬菜对土壤Cd和Pb富集能力的估算

福建农林大学学报（自然科学版） 2006年第2期35卷 207-211页

作者：苏苗育罗丹陈炎辉高树芳王果福建农林大学资源与环境学院福建福州350002

以田间采集的蔬菜和土壤的分析数据为基础,探讨了14种蔬菜对土壤Cd和Pb的富集能力及其估算方法.结果表明,土壤—蔬菜Cd或Pb的转移系数(全量基或DTPA基)随土壤Cd或Pb量(全量或DTPA有效量)的升高而降低.以DTPA提取的有效Cd或Pb为基础计算... 详细信息

以田间采集的蔬菜和土壤的分析数据为基础,探讨了14种蔬菜对土壤Cd和Pb的富集能力及其估算方法.结果表明,土壤—蔬菜Cd或Pb的转移系数(全量基或DTPA基)随土壤Cd或Pb量(全量或DTPA有效量)的升高而降低.以DTPA提取的有效Cd或Pb为基础计算的转移系数比以土壤Cd或Pb全量为基础的转移系数在衡量蔬菜对土壤Cd或Pb的吸收富集能力方面更具合理性.一种作物对土壤Cd或Pb的代表性转移系数应该根据转移系数与土壤Cd或Pb之间的回归方程,在特定的土壤含量点上估算,而不应简单地用平均数或中位值表示.本试验在DTPA有效Cd含量为0.1 ***-1和DTPA有效Pb含量为25 ***-1的点上估算了Cd、Pb的转移系数.Cd向各蔬菜的转移系数(DTPA基0.1)为0.01-0.38,Pb向各蔬菜的转移系数(DTPA基25)为0.0005-0.0063.空心菜对土壤Cd、Pb的富集能力很强,葫芦很弱.空心菜对土壤Cd、Pb的富集能力分别是葫芦的38和12倍.

关键词： Cd Pb 土壤蔬菜富集