Journal of research of the National Bureau of Standards. Section A, Physics and chemistry最新文献_第2页

Humidity Fixed Points of Binary Saturated Aqueous Solutions 二元饱和水溶液的湿度定点

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1977-02-01 DOI: 10.6028/jres.081A.011

L. Greenspan

引用次数: 3445

Standard pH Values for the Potassium Hydrogen Phthalate Reference Buffer Solution from 0 to 60 °C 邻苯二甲酸氢钾参考缓冲溶液的标准pH值从0到60°C

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1977-02-01 DOI: 10.6028/jres.081A.005

H. Hetzer, R. Durst, R. Robinson, R. Bates

引用次数: 6

Vapor Pressure Formulation for Ice 冰的蒸汽压力配方

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1977-02-01 DOI: 10.6028/jres.081A.003

A. Wexler

引用次数: 131

Fluorescence Efficiency of Laser Dyes* 激光染料的荧光效率*

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1976-06-01 DOI: 10.6028/jres.080A.044

K. Drexhage

引用次数: 145

Long-Time Creep in a Pure-Gum Rubber Vulcanizate: Influence of Humidity and Atmospheric Oxygen. 纯胶橡胶硫化胶的长时间蠕变:湿度和大气氧的影响。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1974-09-01 DOI: 10.5254/1.3547441

L. Wood, G. W. Bullman, F. Roth

{"title":"Long-Time Creep in a Pure-Gum Rubber Vulcanizate: Influence of Humidity and Atmospheric Oxygen.","authors":"L. Wood, G. W. Bullman, F. Roth","doi":"10.5254/1.3547441","DOIUrl":"https://doi.org/10.5254/1.3547441","url":null,"abstract":"Long-time creep of natural rubber cured with a sulfur-accelerator recipe containing no filler can be conveniently represented by a plot of (E - E 1)/E 1 = ΔE/E 1 with a double-abscissa scale showing log t and t. E is the elongation at any time t, after application of the load, and E 1 its value at unit time. Experimental data conform to the equation except for a more rapid rise preceding rupture. The constants A and B can be evaluated from only three observations-at the longest time (about 70 days), at one minute, and at an intermediate time. ΔE/E 1 is approximately linear with log t when t is less than 0.1(A/B) and approximately linear with t when t is greater than 4.343(A/B). The observed modulus was about 1.4 MPa and A was about 2.4 percent/(unit log t) when the atmosphere was a vacuum, dry N2, or dry air. The modulus was lowered very slightly and A became about 4 percent/(unit log t) when the air was saturated with water. B was raised from about 2 × 10-5 percent/min to about 20 × 10-5 percent/min when the vacuum or dry N2 was replaced by dry air and to about 50 × 10-5 percent/min when the air was saturated with moisture. A is considered to be related to physical relaxation, while B corresponds to a chemical reaction, probably oxidative degradation.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1974-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75240179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Reactions of fluorocarbon ions in C2F6. Implications for the radiolysis 碳氟离子在C2F6中的反应。对放射溶解的影响

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1974-03-01 DOI: 10.6028/JRES.078A.012

L. W. Sieck, R. Gorden, P. Ausloos

引用次数: 3

Relation of vitron theory to 2-layer-liquid immiscibility in binary silicate and borate glass melts 玻子理论与二元硅酸盐和硼酸盐玻璃熔体两层液不混相的关系

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1973-03-01 DOI: 10.6028/JRES.077A.018

L. W. Tilton

引用次数: 1

Radiolysis of methane. Formation of acetylene 甲烷的辐射分解。乙炔的形成

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1973-01-01 DOI: 10.6028/jres.077a.005

R. Rebbert, P. Ausloos

引用次数: 7

Newer Fluorometric Methods for the Analysis of Biologically Important Compounds. 用于分析重要生物化合物的新荧光法。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1972-11-01 DOI: 10.1007/978-3-642-49204-4_23

G. Guilbault

引用次数: 1

Modulus of Natural Rubber Cross-Linked by Dicumyl Peroxide. I. Experimental Observations. 过氧化二氨基交联天然橡胶的模量。1 .实验观察。

Journal of research of the National Bureau of Standards. Section A, Physics and chemistry Pub Date : 1972-09-01 DOI: 10.5254/1.3544746

L. Wood, G. W. Bullman, G. Decker

{"title":"Modulus of Natural Rubber Cross-Linked by Dicumyl Peroxide. I. Experimental Observations.","authors":"L. Wood, G. W. Bullman, G. Decker","doi":"10.5254/1.3544746","DOIUrl":"https://doi.org/10.5254/1.3544746","url":null,"abstract":"Natural rubber mixed with varying amounts of dicumyl peroxide was cross-linked by heating 120 min at 149 °C. The quantitative measure of cross-linking was taken as the amount fp of decomposed dicumyl peroxide, the product of p, the number of parts added per hundred of rubber and f the fraction decomposed during the time of cure. The shear creep modulus G was calculated from measurements of the indentation of a flat rubber sheet by a rigid sphere. The glass transition temperature T g , was raised about 1.2 °C for each part of decomposed dicumyl peroxide. Above (T g + 12) the modulus-temperature relations were linear with a slope that increased with increasing cross-linking. The creep rate was negligible except near the glass transition and at low values of fp. Values of G, read from these plots at seven temperatures, were plotted as a function of fp. The linearity of the two plots permits the derivation of the general relation: G = S(fp + B)T + H(fp + B) + A where A, B, H, and S are constants. The lines representing G as a function of fp at each temperature all intersected near the point, fp = 0.45 phr, G = 2.70 Mdyn cm-2 (0.270 MN m-2). The constants were evaluated as A = 2.70 Mdyn cm-2, B = -0.45 phr, S = 5.925 × 10-3 Mdyn cm-2(phr)-1K-1 and H = 0.0684 (Mdyn cm-2) (phr)-1. This equation represented satisfactorily all the data obtained at temperatures from -50 to +100 °C for values of fp from about 1 to 24 phr.","PeriodicalId":94340,"journal":{"name":"Journal of research of the National Bureau of Standards. Section A, Physics and chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1972-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85112075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6