Impact of UV Radiation on the Physical Properties of 100% Raw Kapok Fibers Needle-punched Compound Nonwovens for Agrotextile Applications

2021 ◽  
pp. 1-14
Author(s):  
Paz Pividal
Keyword(s):  
Physical Properties ◽  
Uv Radiation ◽  
Kapok Fibers

scholarly journals MODIFICATION AND CHARACTERIZATION OF CEIBA PENTANDRA (L.) GAERTN. (KAPOK) FIBER: PHYSICAL PROPERTIES

2019 ◽  
Vol 7 (7) ◽  
pp. 381-390
Author(s):  
Eduart Wolok ◽  
Idham Halid Lahay ◽  
Buyung R. Machmoed ◽  
Fahriadi Pakaya
Keyword(s):  
Heavy Metals ◽  
Physical Properties ◽  
Protective Layer ◽  
Absorption Capacity ◽  
Natural Material ◽  
Cellulose Content ◽  
Kapok Fiber ◽  
Fiber Properties ◽  
Kapok Fibers

Kapok fiber is a natural material that has unique properties, can be renewed with a large lumen, it has hydrophobic properties, as an absorbent in oil, heavy metals, and sound. To increase the absorption capacity of heavy metals, physical properties, and chemical resistance, modifications were made to change the fiber properties from hydrophobic to hydrophilic. One way is through the process of soaking the kapok fibers in a solvent to remove non-cellulose compounds. In this study, to improve the properties of kapok fiber, soaking has been done with various solutions, there are HCl, NaOH, NaClO, NaClO-NaOH-NaClO, and NaClO2-NaOH-NaClO2 solution. Immersion of kapok fibers in NaClO2-NaOH-NaClO2 solution can increase cellulose content up to 93.69% with porosity content of 4.75%. NaClO2-NaOH-NaClO2-treated can absorb water up to 211.27%, the second highest after treatment with the NaClO-NaOH-NaClO-treated solution of 285.29%. Immersion in NaClO-NaOH-NaClO and NaClO2-NaOH-NaClO2 solvents also causes damage to the kapok fiber protective layer which indicates the loss of lignin, so that a significant change of the hydrophobic fiber becomes hydrophilic as seen in the SEM results.

scholarly journals EFFECT OF REJUVENATORS ON PENETRATION AND SOFTENING POIND OF AGED POLYMER-MODIFIED ROAD BITUMEN

2021 ◽  
Vol 13 (0) ◽  
pp. 1-6
Author(s):  
Audrius Vaitkus ◽  
Indrė Palionytė ◽  
Rita Kleizienė
Keyword(s):  
Experimental Study ◽  
Physical Properties ◽  
Uv Radiation ◽  
Asphalt Pavement ◽  
Life Time ◽  
Softening Temperature ◽  
Short Term ◽  
Optimal Amount ◽  
Solar Uv

The article describes the effiency of polymer-modified road bitumen regeneration with two types of rejuvenators. Two alternative rejuvenators have been selected aromatic oil Nygen 910 and soft road bitumen V12000. PMB 45/80-55 bitumen, which is used in the upper and lower layers of asphalt pavement, was investigated. During the life time of the asphalt pvement, due to the effects of solar UV radiation, temperature and oxygen, of all the layers of the structure asphalt top layer reaches the highest degree of aging. Short-term and long-term aging were performed to simulate the aging of the bitmen under laboratory conditions. To determine the optimal amount of rejuvenator experiments were performed with 8%, 10% ir 14% rejuvenator by bitumen mass. The effect of rejuvenators were evaluated by studying the main physical properties of bitumen: penetration and softening temperature. Ina n experimental study, aromatic oil was found to be more than 2.5 times more effective than soft bitumen.

scholarly journals Impact of UV radiation on the physical properties of polypropylene floating row covers

2011 ◽  
Vol 10 (41) ◽  
pp. 7998-8006
Author(s):  
Demscaron ar rej ◽  
Žnidarčič Dragan ◽  
Gregor Svetec Diana
Keyword(s):  
Physical Properties ◽  
Uv Radiation ◽  
Row Covers

scholarly journals An overview of the PAHTAT toolbox

2013 ◽  
Vol 9 (S303) ◽  
pp. 208-210
Author(s):  
P. Pilleri ◽  
C. Joblin ◽  
O. Berné ◽  
J. Montillaud ◽  
Y. Okada
Keyword(s):  
Physical Properties ◽  
Ir Spectra ◽  
Radiation Field ◽  
Uv Radiation ◽  
Column Density ◽  
Line Of Sight ◽  
Mid Infrared ◽  
Physical Conditions ◽  
Ionization Parameter

AbstractIn this contribution, we briefly describe how an observed mid-infrared (5.5-14 μm) spectrum can be used to trace key physical conditions along a given line of sight, such as the UV radiation field, the ionization parameter and the dust column density. These parameters are often difficult to determine independently from PDR models. The PAHTAT toolbox offers the opportunity to analyze mid-IR spectra using a limited number of parameters, that are associated with the physical properties of the dust and gas being observed.

The Effect of Polymer Molecular Weight and UV Radiation on Physical Properties and Bioactivities of PCL Films

2011 ◽  
Vol 30 (5) ◽  
pp. 261-276 ◽  
Author(s):  
Chih-Chang Yeh ◽  
Cheng-Nan Chen ◽  
Yun-Ting Li ◽  
Chao-Wei Chang ◽  
Ming-Yan Cheng ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Physical Properties ◽  
Uv Radiation ◽  
Polymer Molecular Weight

scholarly journals The Effects of UV Radiation on Human Hair Concerning Physical Properties and Fine Structure of Protein.

1993 ◽  
Vol 27 (3) ◽  
pp. 424-431 ◽  
Author(s):  
Setsuko Kanetaka ◽  
Koshiro Tomizawa ◽  
Hiromi Iyo ◽  
Yoshiharu Nakamura
Keyword(s):  
Fine Structure ◽  
Physical Properties ◽  
Uv Radiation ◽  
Human Hair

The preparation and physical properties of UP/montmorillonite nanocomposite by UV radiation curing

2006 ◽  
Vol 101 (6) ◽  
pp. 3609-3615 ◽  
Author(s):  
Ho-Gyum Kim ◽  
Dong-Hee Han ◽  
Jeong-Cheol Lim ◽  
Dae-Hee Oh ◽  
Kyung-Eun Min
Keyword(s):  
Physical Properties ◽  
Uv Radiation ◽  
Radiation Curing

The Photometric Properties of the Ap Stars

1976 ◽  
Vol 32 ◽  
pp. 365-377 ◽  
Author(s):  
B. Hauck
Keyword(s):  
Physical Properties ◽  
Ap Stars

The Ap stars are numerous - the photometric systems tool It would be very tedious to review in detail all that which is in the literature concerning the photometry of the Ap stars. In my opinion it is necessary to examine the problem of the photometric properties of the Ap stars by considering first of all the possibility of deriving some physical properties for the Ap stars, or of detecting new ones. My talk today is prepared in this spirit. The classification by means of photoelectric photometric systems is at the present time very well established for many systems, such as UBV, uvbyβ, Vilnius, Geneva and DDO systems. Details and methods of classification can be found in Golay (1974) or in the proceedings of the Albany Colloquium edited by Philip and Hayes (1975).

The Infection of Cells by Bullet-Shaped Viruses

1969 ◽  
Vol 27 ◽  
pp. 372-373
Author(s):  
Frederick A. Murphy ◽  
Alyne K. Harrison ◽  
Sylvia G. Whitfield
Keyword(s):  
Electron Microscopy ◽  
Physical Properties ◽  
Host Cell ◽  
Thin Section ◽  
Cultured Cells ◽  
Cell Infection ◽  
Thin Section Electron Microscopy ◽  
Section Electron ◽  
Section Electron Microscopy

The bullet-shaped viruses are currently classified together on the basis of similarities in virion morphology and physical properties. Biologically and ecologically the member viruses are extremely diverse. In searching for further bases for making comparisons of these agents, the nature of host cell infection, both in vivo and in cultured cells, has been explored by thin-section electron microscopy.

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