Growth Rate of Natural Rubber Crystallites

1966 ◽  
Vol 39 (2) ◽  
pp. 206-210 ◽  
Author(s):  
R. E. Hammett ◽  
R. E. Wingard ◽  
J. E. Land
Keyword(s):  
Thermal Analysis ◽  
Growth Rate ◽  
Differential Thermal Analysis ◽  
Natural Rubber ◽  
Degree Of Crystallinity ◽  
Melting Range ◽  
Analysis Technique ◽  
Heat Effects ◽  
Differential Thermal Analysis Technique ◽  
The Degree Of Crystallinity

Abstract The melting range and growth rate curves for natural rubber crystallites have been studied by the differential thermal analysis technique. The results obtained compare favorably with the growth rate curves obtained by dilatometric techniques. The use of differential thermal analysis revealed details of the crystallite melting which were not apparent when the dilatometer was used; however, no quantitative data on heat effects or the degree of crystallinity were calculated.

Liquidus projection of the ternary Ag–Sn–Ni system

2004 ◽  
Vol 19 (8) ◽  
pp. 2262-2267 ◽  
Author(s):  
Sinn-wen Chen ◽  
Hsiu-feng Hsu ◽  
Chih-wei Lin
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Ternary System ◽  
Liquidus Projection ◽  
Thermal Analysis Technique ◽  
Primary Solidification Phase ◽  
Ni Alloys ◽  
Analysis Technique ◽  
Differential Thermal Analysis Technique ◽  
Rich Side

The liquidus projection of the ternary Sn–Ag–Ni system at the Sn-rich side was determined experimentally. No ternary compound was found, and the ζ–Ag4Sn, Ag3Sn, and Sn existed as the primary solidification phases only in very small compositional portions of the ternary Sn–Ag–Ni system. In more than half of the compositional regime of the ternary system, the Ni3Sn2 phase was the primary solidification phase. The differential thermal analysis technique was used to determine the reaction temperatures and solidification sequences of various Sn-rich Sn–Ag–Ni alloys. Three invariant reactions were found: L = Sn + Ni3Sn4 + Ag3Sn, L + ζ–Ag4Sn = Ni3Sn4 + Ag3Sn and L + Ni3Sn2 = ζ–Ag4Sn + Ni3Sn4. Their reaction temperatures have been determined to be 219, 488, and 516.5 °C, respectively.

scholarly journals Impact of environmental agents on non-woven polylactide/natural rubber agrofiber

2021 ◽  
Vol 285 ◽  
pp. 07034
Author(s):  
Yulia Tertyshnaya ◽  
Maksim Zakharov ◽  
Alina Ivanitskikh ◽  
Anatoliy Popov
Keyword(s):  
Natural Rubber ◽  
Uv Irradiation ◽  
Thermal Characteristics ◽  
Degree Of Crystallinity ◽  
Distilled Water ◽  
Fibrous Materials ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Environmental Agents ◽  
The Degree Of Crystallinity

In the work an eco-friendly non-woven fiber made of polylactide and natural rubber with a rubber content from 0 to 15 wt.% was obtained by electrospinning. The influence of distilled water and UV irradiation on the agrofibers has been investigated. The water sorption test showed that the addition of natural rubber into the polylactide matrix does not significantly affect the degree of water absorption of the fibrous materials, which is in the range of 49-50.6%. Thermal characteristics after 180 days of degradation in distilled water at 22±2 oC and UV irradiation at a wavelength of 365 nm during 100 hours were determined using the differential scanning calorimetry. Changes in the values for glass transition and melting temperatures, and the degree of crystallinity were determined.

scholarly journals Selectively Etched Halloysite Nanotubes as Performance Booster of Epoxidized Natural Rubber Composites

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3536
Author(s):  
Indra Surya ◽  
Kamaruddin Waesateh ◽  
Abdulhakim Masa ◽  
Nabil Hayeemasae
Keyword(s):  
Natural Rubber ◽  
Treatment Time ◽  
Halloysite Nanotubes ◽  
Epoxidized Natural Rubber ◽  
Degree Of Crystallinity ◽  
X Ray Scattering ◽  
Natural Rubber Composites ◽  
Matrix Interactions ◽  
Strain Induced Crystallization ◽  
The Degree Of Crystallinity

Halloysite Nanotubes (HNT) are chemically similar to clay, which makes them incompatible with non-polar rubbers such as natural rubber (NR). Modification of NR into a polar rubber is of interest. In this work, Epoxidized Natural Rubber (ENR) was prepared in order to obtain a composite that could assure filler–matrix compatibility. However, the performance of this composite was still not satisfactory, so an alternative to the basic HNT filler was pursued. The surface area of HNT was further increased by etching with acid; the specific surface increased with treatment time. The FTIR spectra confirmed selective etching on the Al–OH surface of HNT with reduction in peak intensity in the regions 3750–3600 cm−1 and 825–725 cm−1, indicating decrease in Al–OH structures. The use of acid-treated HNT improved modulus, tensile strength, and tear strength of the filled composites. This was attributed to the filler–matrix interactions of acid-treated HNT with ENR. Further evidence was found from the Payne effect being reduced to 44.2% through acid treatment of the filler. As for the strain-induced crystallization (SIC) in the composites, the stress–strain curves correlated well with the degree of crystallinity observed from synchrotron wide-angle X-ray scattering.

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