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以聚己内酯二元醇(PCL)为软段,二羟甲基丙酸(DMPA)为扩链剂,异佛尔酮二异氰 酸酯(IPDI)为硬段,合成了水性聚氨酯预聚体.通过进一步添加双酚芴(BPFL)反应合成一系 列含 Cardo环水性聚氨酯(WPUS).利用傅里叶变换红外光谱、粒径、热重、力学、X灢射线衍射、 水接触角测定和纸张表面施胶等方法对制备的 WPUS的结构和性能进行表征.结果表明,当 WPUS的 BPFL含量为3%时,WPUS乳液的粒径增大至95.21nm;膜的耐热性最大提高 31.36%;水接触角提升32.13%.不同乳液对纸张表面施胶后与未施胶纸张相比,WPUS3纸 张水接触角提升887.6%;抗张强度最大可达57.1N/mm2,提升46.41%;纸张耐折度最大可 达74次,比未施胶原纸高出60次. [ABSTRACT FROM AUTHOR]

Two kinds of cellulose/ZnO piezoelectric papers are prepared by crushing and dissolving methods. The papers are characterized by SEM and analyzed by a piezoelectric equipment. The differences in the structure and piezoelectric performance of the two kinds of papers are explored. The effects of ZnO add-on amount, thickness of the papers, and pressure on the piezoelectric properties are discussed and compared with a PVDF film. The mutts show that the fibers of the piezoelectric paper prepared by the dissolving method are smooth and tightly bounded to ZnO, which makes ZnO uniformly coat on the surface of the fibers. The higher the pressure, the higher the piezoelectric properties. The thicker the piezoelectric paper, the higher the piezoelectric properties. The piezoelectric paper with 20% ZnO added by the dissolving method has high piezoelectric properties, and the maximum output current is 52.36 nA/cm². The piezoelectric properties of the piezoelectric paper are comparable to the purchased PVDF film. [ABSTRACT FROM AUTHOR]

Background-- With thc vigorous devctopmcnt of China's financiat indiistry, it is of great significance to stiidy thc impact of financing constraints on the qiiatitv of paper pindncts exported. ⑵ Methods-- Based on thc data of export qiiantity and cxport price in thc CEP11 BAC1, with post-rcverse mcthod, thc qiiatitv of China's paper prodncts exported in 2002-2016 is measured and thc characteristics of qiiatitv change arc anatyzed. In addition, a regression modet is cstattishcd to stiidv the impact of financing constraints on the qiiatitv of China's paper products exported. (8)Results-- It can be seen from meastirement rcsutts that the qiiatitv of China's paper prodncts exported has dectined stighttv, from 0. 581 in 2002 to 0. 573 in 2016, due to the stmcttirat change of China's paper export destinations. Fmm 2002 to 2010，the qiiatitv of paper prodncts exported shows a downward trend. In 2010 -2016, with the graduat recovery of the wortd economy, the qiiatitv of paper prodncts exported has graduatty increased ,biit it stitt faits to reach a high tevet. Prom thc regression rcsutts on thc impact of financing constraints on thc qiiatitv of paper prodncts exported, it's found that both internat and cxtcrnat financing constraints have an impact on the qiiatitv of paper prodncts exported. From the pcrspcctivc of externat financing, the impact of bank toan index variabtes on thc qiiatitv of exported paper prodncts is positivc, and thc regression cocfricicnt is 0. 194. The impact of commerciat credit constraint index variabtes on thc qiiatitv of paper prodncts exported is not significant, which shows that for cnteiprises, the source of bank credit funds is more stabtc, the targer thc scate of funds avaitabte，thc tonger the period of funds avaitabte, and a stabtc source of funds is more conducive to promo ting tcchnotogv research and devctopmcnt and improving thc qiiatitv of enterprises. From thc pcrspcctivc of in- tcrnat financing, thc impact of cash ftow index on the qiiatitv of paper pindiicts exported is positivc, with a regression cocfricicnt is 0. 132. The effect of thc paid in capitat indicator variabtes on the qnatity of China's paper prodncts exported is not significant. In addition, China's per capita income, per capita income of cxport destinations ,tabor costs, and R&D investmcnt att have significanttv promo ted the qiiatitv of China's exported paper pmdncts. The regression cocfficicnts arc 0. 314, 0. 149, 0. 387 and 0. 051, rcspcctivety. Finatty, foreign direct investmcnt has no significant impact on thc qiiatitv of Chinese paper prodncts exported. (4)Conclusions and Discussions-- In order to improve thc qiiatitv of cxport paper prodncts，thc government shoutd speed up the cons tine tion of the banking system and transform the financiat system dominated by statc-owned banks, Additionattv, we shoutd encourage the devctopmcnt of smatt and medium-sized banks, devetop the securities market and buitd a mutti-tevet financiat market system, so as to broaden thc financing channets for paper prodncts enterprises and creatc a good financiat envimnment. In addition, financiat ins ti tti tions shoutd continnc to innovate financiat prodncts, combining with the business modet of paper prodncts indnstrv and thc characteristics of different business tinks, and imptcment diffcrentiatcd financing methods. Besides, paper prodncts enterprises shoutd buitd an information sharing ptatform to improve the qiiatitv of information disctosure ,rcdtice financing costs and improve financing efficiency. What/s more, paper prodncts enterprises shoutd improve their credit tevet, strengthen thc management of tcadci's. Finatly, enterprises should increase technologv investmcnt, pay attention to tcchnologv research and devctopmcnt, and improve pindiict tcchnologv level. [ABSTRACT FROM AUTHOR]

Brain science is the research front and hot topic in the field of life science and the U.S.are the technology power in the field. In this paper, gaps of theory research and application research between China and the U.S.based on paper and patent data in terms of bibliometric analysis are studied. Results show that in terms of comparison of theory research based on published paper, China starts later than the U.S., but the quantitative gap of paper number between two countries is increasingly decreasing, however, the gap of academic impact is large; in terms of comparison of application research based on patent, patent number applied by China exceeds slightly that of the U.S., however, the gap of proportion of PCT patent, layout design of technology, leading companies, and ratio of R&D activity of company that represent technical value and market value of patent are still large. [ABSTRACT FROM AUTHOR]

The study utilizes bibliometrics to explore papers and patents in the field of fuel cell to examine the scientific and technical development in the area. The research data were retrieved from the WOS database and USPTO patent data from the period between 1991 and 2010, which consists of 20,758 papers and 8,112 patents. The authors analyzed numbers of papers and patents to examine the trends in the papers and patents in different countries, organizations and individuals. The results indicate upward growth in both papers and patents in fuel cell, with a higher growth rate for papers. The study shows that major paper and patent output are concentrated in a small number of countries. An imbalance exists between the number of papers published and the patents granted in organizations. The organizations that published papers and patents vary in type and category. Very few individual researchers are able to produce high numbers of both papers and patents. [ABSTRACT FROM AUTHOR]

Objective To compare the paper method and national standard method for food mould inspection. Methods Took 416 samples of pastries, drinks and others from the center quality management division in Wangjiang County Center for Disease Prevention and Control of Anhui province. inlcuding 317 pastries and 99 drinks, all of which were sent to conduct mould inspection by paper method and national standard methods. It should be compared their results. Results Among them, the qualification rate of pastries and drinks by the national standard method was 75.5%and 63.% respectively while those by paper method 78.9%, 65.7%, which showed the two methods had no statistcal significane in difference (x2=0.899, 0.088, P>0.05). Conclusion The two method is avaliable for mould inspection while the paper method is quicker, simpler, more effective and more practical, who may replace the national standard method. [ABSTRACT FROM AUTHOR]