Stearyl Stearamide

CAS

13276-08-9

Catalog Number

ACM13276089

Category

Main Products

Molecular Weight

535.97

Molecular Formula

C36H73NO

MSDS COA Spec Sheet

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Specification

Synonyms

N-octadecylstearamide

Melting Point

87 - 91 °C

Appearance

Solid

Permeability modification of polyethylene foam using stearyl stearamide

Volume change of 98/2 LDPE/stearyl stearamide and neat LDPE extruded foam during the aging at 408C

Fukasawa, Yoshihito, et al. Journal of cellular plastics 44.2 (2008): 107-123.

Low-density polyethylene (LDPE) foam obtained by extrusion foaming with isobutylene as a foaming agent can be inhibited from shrinking and its dimensional stability can be improved by blending with stearamide permeability modifier. In order to understand the mechanism of permeability modification, the gas permeability and surface structure of LDPE-stearyl stearamide blend films at different aging periods were studied by using a gas permeability tester, scanning electron microscopy (SEM), attenuated total reflectance-infrared spectroscopy (ATR-IR) and grazing incidence X-ray diffraction (GIXD). After aging, a thin layer composed of distorted particles appeared on the surface of the blend film. The amount of surface stearamide increased with increasing aging time. These results indicate that stearyl stearamide seeps out to the film surface during aging. Gas permeability is suppressed by increasing the amount of stearyl stearamide that seeps out on the surface due to reduced solubility, and the permeability of isobutane becomes less than that of air over time. This permeability modification improves the dimensional stability of LDPE foam during extrusion and post-extrusion aging.
The polymer sample was LDPE. Stearoyl stearamide was used as a permeability regulator. LDPE and stearyl stearamide were blended using a twin-screw extruder. The blend compositions of stearyl stearamide were 0 wt% and 2 wt%. Expanded rod foam blends of LDPE and stearamide were prepared by extrusion foaming method using isobutane as a blowing agent. The blowing agent was added to LDPE at 7 pph. The obtained foamed samples were stored at 408 °C for 3 days to obtain aged samples showing dimensional stability. The diameter and length of the expanded rod foam were measured during the heat treatment to calculate the volume change of the foam. Blended films of LDPE-stearoyl stearamide were prepared as cell membrane models for highly expanded extruded foams. The film samples were obtained by blown extrusion method with a thickness of 40~50 mm. The obtained film samples were aged at 838 °C for different times to correspond to the thermal history of extrusion foaming extruded at about 1108 °C and slowly cooled to room temperature. In order to observe the effect of the surface layer on the permeability modification, the surface of the film sample was rubbed with a nonwoven fiber cloth made of acrylic resin. Both sides of the film were rubbed at a pressure of 3.4 kPa and a speed of 31 mm/s.

Stearoyl stearamide as a polyethylene additive

Two foam samples, with 2 wt.% of stearyl stearamide (left sample) and without additives, saturated with isobutane and transferred into air.

Nauta, Warner Jan. (2000).

The properties of polymer/additive blends are analyzed and a model is proposed to explain the improved dimensional stability. Low-density polyethylene (LDPE) has been used as the polymer because it exhibits severe volume changes in foam extrusion using alkanes as blowing agents. Permeability measurements were performed using LDPE films blended with a certain amount of stearyl stearamide. The gases used were isobutane and air. The films were heat treated and the structural changes were characterized using scanning electron microscopy, infrared spectroscopy, and wide-angle X-ray diffraction. These structural effects will be related to the changes in permeability.
After closed-cell foam production, the cells are filled with gaseous blowing agent. This means that there will be a partial pressure gradient for the blowing agent, causing the foam to permeate. At the same time, there is a partial pressure gradient for air, causing air to flow into the foam. Therefore, the blowing agent will be replaced by air. To simulate this process, foam samples were saturated with isobutane and transferred to air. These samples were placed on a millimeter grid and scanned immediately after transfer to air (a), after approximately 9 hours (b), after approximately 29 hours (c), and after 135 hours (d). The sample on the left contains 2 wt.% of the additive stearoyl stearamide, while the sample on the right does not contain any additive. It can be observed that when 4(a) is compared to 4(b), the sample without additive collapses, but increases in volume through 4(c) and recovers to about 95% of its original volume after 135 hours, 4(d). However, the sample containing 2 wt.% stearoyl stearamide is dimensionally stable. Although this exchange is isothermal and gas exchange after foam production begins during foam cooling, this image nicely shows the dimensional changes of low-density closed-cell polyethylene foams after production.

What is the molecular formula of stearyl stearamide?

The molecular formula of stearyl stearamide is C36H73NO.

What are the synonyms for stearyl stearamide?

The synonyms for stearyl stearamide are octadecanamide, N-octadecyl- and N-octadecyloctadecanamide.

What is the molecular weight of stearyl stearamide?

The molecular weight of stearyl stearamide is 536.0 g/mol.

When was stearyl stearamide first created?

Stearyl stearamide was first created on August 8, 2005.

What is the IUPAC name of stearyl stearamide?

The IUPAC name of stearyl stearamide is N-octadecyloctadecanamide.

What is the InChIKey of stearyl stearamide?

The InChIKey of stearyl stearamide is DJWFNQUDPJTSAD-UHFFFAOYSA-N.