Adhesion Measurement on Thin Evaporated Films

2009 ◽  
pp. 198-198-10 ◽  
Author(s):  
K Kuwahara ◽  
H Hirota ◽  
N Umemoto
Keyword(s):  
Adhesion Measurement

scholarly journals Medidas de adesão entre agregado e ligante asfáltico

TRANSPORTES ◽  
2008 ◽  
Vol 16 (1) ◽  
Author(s):  
Kamilla Lima Vasconcelos ◽  
Amit Bhasin ◽  
Dallas N. Little ◽  
Jorge Barbosa Soares
Keyword(s):  
Chemical Interaction ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Adhesion Measurement ◽  
Materials Used ◽  
Enthalpy Of Immersion ◽  
Physical And Chemical ◽  
Energy Components

<p>A adesão entre agregado e ligante asfáltico vem sendo apontada como uma propriedade de grande importância para a causa de defeitos encontrados em pavimentos asfálticos, tais como trincas por fadiga, e dano por umidade. Diferentes mecanismos existem na literatura para explicar a adesão entre os dois materiais, porém, estes mecanismos podem ser resumidos em três grandes grupos: inter- travamento mecânico, adesão física, e interação química. A ocorrência de mais de um mecanismo simultaneamente parece ser o fenô- meno mais provável, sendo a relevância de cada um dependente das características físicas e químicas do agregado e do ligante asfálti- co. No presente trabalho, dois procedimentos foram utilizados para acessar a adesão entre agregado e ligante. O primeiro constou do cálculo do trabalho de adesão através da energia livre de superfície dos materiais envolvidos e o segundo, da determinação da entalpia de imersão quando soluções de asfalto são postas em contato com o agregado. Todos os materiais usados foram provenientes da biblio- teca de referência do SHRP sendo um pedregulho como agregado, e três diferentes ligantes asfálticos. Os resultados mostraram a capa- cidade do microcalorímetro em detectar possíveis interações químicas na adesão entre agregado e ligante asfáltico, em conjunto com adesão física. A presença de grupos funcionais mais fortemente adsorvidos pela superfície dos agregados justificou os maiores valores de entalpia de imersão para as combinações onde esses grupos se encontravam presentes.</p><p><em><strong>Abstract</strong> Adhesion between the asphalt binder and the aggregate is critical to the performance and durability of asphalt mixtures. According to the literature, distresses mechanisms such as fatigue cracking and moisture induced damage are correlated to the nature and quality of adhesion between these two materials. Different mechanisms already exist to explain adhesion, but they can be summa- rized in three main groups: mechanical interlocking, physical adhesion and chemical interaction. Although discussions of isolated theo- ries and mechanisms help to clarify the understanding of adhesion, they can rarely be separated completely to each other. The physical and chemical characteristics of asphalt and aggregate will in fact determine the relevance of each of these mechanisms. This study presents the results of two procedures for adhesion measurement: (i) an indirect method based on the surface free energy components of asphalt binder and aggregate; and (ii) the determination of the enthalpy of immersion through the use of a microcalorimeter. The materials used, a gravel as aggregate and three different neat asphalts, were provided by the Strategic Highway Research Program's Material Reference Library. The results showed the capacity of the microcalorimeter in detecting possible chemical reactions together with physical adhesion. The presence of functional groups more strongly adsorbed by the aggregate surface justified the higher values of the heat of immersion. </em></p>

Nanofork for Single Cells Adhesion Measurement via ESEM-Nanomanipulator System

2012 ◽  
Vol 11 (1) ◽  
pp. 70-78 ◽  
Author(s):  
M. R. Ahmad ◽  
M. Nakajima ◽  
M. Kojima ◽  
S. Kojima ◽  
M. Homma ◽  
...  
Keyword(s):  
Single Cells ◽  
Adhesion Measurement

scholarly journals Hydroxypropylsulfonation/Caproylation of Cornstarch to Enhance Its Adhesion to PLA Fibers for PLA Sizing

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1197 ◽  
Author(s):  
Wei Li ◽  
Jie Wu ◽  
Xingui Cheng ◽  
Lanjuan Wu ◽  
Zhi Liu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Internal Stress ◽  
Mechanical Behaviors ◽  
Cohesive Failure ◽  
Adhesive Layers ◽  
Adhesion Measurement ◽  
Acid Sodium Salt ◽  
The Stability ◽  
The Impact ◽  
Scanning Electron

The impact of hydroxypropylsulfonation/caproylation on the adhesion of cornstarch to polylactic acid (PLA) fibers was investigated for ameliorating the applications such as PLA sizing. The hydroxypropylsulfonated and caproylated cornstarch (HCS) samples with different degrees of substitution (DS) were synthesized by a hydroxypropylsulfonation of acid-converted cornstarch (ACS) with 3-chloro-2-hydroxy-1-propanesulfonic acid sodium salt (CHPS-Na) and subsequently a caproylation with caproic anhydride (CA). The HCS granules were characterized by Fourier transform infrared spectroscopic and scanning electron microscopy. The adhesion was evaluated by measuring the bonding forces of the PLA roving impregnated. The mechanical behaviors of the adhesive layers were estimated by determining the properties of the films. The results of adhesion measurement were also analyzed especially through the wetting and spreading of the paste on the fiber surfaces, as well as the failure type, internal stress and mechanical behaviors of the adhesive layers among fibers. Additionally, apparent viscosity and its stability of the pastes were also determined. It was found that hydroxypropylsulfonation/caproylation was not only able to obviously improve the adhesion of ACS to PLA fibers, but also capable of further improving the adhesion of hydroxypropylsulfonated starch (HS) to the fibers. With the rise in the total DS, the adhesion gradually increased. The two substituents improved the wetting and spreading, reduced the internal stress, lowered the probabilities of interfacial failure and cohesive failure, decreased the film brittleness, and increased the van der Waals force at the interfaces. Moreover, the HCS samples with a stability of above 85% could meet the demand on the stability for sizing. Considering the experimental results of the adhesion and the analysis of the results, HCS showed potential in the application of PLA sizing.

Adhesion measurement and analysis at cell/encapsulant interface as quality control tools during PV module manufacture

1999 ◽  
Author(s):  
Neelkanth G. Dhere ◽  
Kaustubh S. Gadre ◽  
Nachiket R. Raravikar ◽  
Shashank R. Kulkarni ◽  
Piyush S. Jamkhandi ◽  
...  
Keyword(s):  
Quality Control ◽  
Pv Module ◽  
Adhesion Measurement ◽  
Measurement And Analysis

Adhesion measurement of thin films on glass substrates

1989 ◽  
Vol 171 (1) ◽  
pp. 93-98 ◽  
Author(s):  
A. Kinbara ◽  
S. Baba ◽  
A. Kikuchi ◽  
T. Kajiwara ◽  
K. Watanabe
Keyword(s):  
Thin Films ◽  
Glass Substrates ◽  
Adhesion Measurement

Fabrication and Adhesion Measurement of a Nanotextured Surface with Ionic Liquid Monolayers

2011 ◽  
Vol 115 (20) ◽  
pp. 10125-10130 ◽  
Author(s):  
Yufei Mo ◽  
Fuchuan Huang ◽  
Shulin Pan ◽  
Shizhao Huang
Keyword(s):  
Ionic Liquid ◽  
Adhesion Measurement
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