✦ LIBER ✦

Impact of polyurea structure on grease properties

✍ Scribed by L. Liu; H. W. Sun

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 637 KB
Volume: 22
Category: Article
ISSN: 0954-0075
DOI: 10.1002/ls.140

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The thickener structure of polyurea grease has a crucial effect on its properties. Therefore, it is very important to study the relationship between a thickener structure and physical and performance properties. In this study, polyurea greases were synthesised, having a different number of urea groups in per polyurea thickener molecule. Properties such as dropping point, penetration, oil separation, shear stability and four‐ball wear and extreme pressure (EP) were evaluated. The result shows that properties of polyurea grease vary with the number of urea group per polyurea molecule. Based on molecular theory, the mechanisms explaining these effects are briefly discussed. Copyright © 2010 John Wiley & Sons, Ltd.

📜 SIMILAR VOLUMES

Dibenzyl structure on the macromolecular

Dibenzyl structure on the macromolecular chain. XII. Polyureas: structure-property relatonships

✍ Elena Scorţanu; Ioan Nicolaescu; Adrian A Caraculacu; Georgeta Caraculacu 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 123 KB

Structure and oil-resistant properties o

Structure and oil-resistant properties of HTPB-based polyurea modified with polysulfide

✍ Yiwu Quan; Qingjun Wang; Wenzhao Dong; Qingmin Chen 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 78 KB 👁 2 views

The influence of lubricating fluid type

The influence of lubricating fluid type on the properties of biodegradable greases

✍ Florea, Ortansa ;Luca, Marcel ;Constantinescu, Anca ;Florescu, Danilian 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 452 KB

## Abstract The lubricating ability of a grease depends on both the base oil and the thickener. As a result of their intrinsic properties and/or because of their com‐patibility with thickeners and specific additives, base fluids have different influences upon the properties of grease formulations.

Structure and properties of impact copol

Structure and properties of impact copolymer polypropylene. I. Chain structure

✍ Cai Hongjun; Luo Xiaolie; Ma Dezhu; Wang Jianmin; Tan Hongsheng 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 191 KB 👁 1 views

In this work, impact copolymer polypropylene (ICPP) was fractionated into 4 fractions. ICPP and the 4 fractions were studied using Fourier transform infrared and 13 C nuclear magnetic resonance analysis. The results demonstrate that fraction A is ethylene-propylene rubber, fraction B is ethylene-pro

Impact of Structural Properties on the M

Impact of Structural Properties on the Mechanisms of Optical Amplification in Cubic GaInN

✍ J. Holst; A. Hoffmann; I. Broser; D. Rudloff; F. Bertram; T. Riemann; J. Christe 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 173 KB 👁 2 views

The structural and the optical properties of cubic GaInN MBE-grown on GaAs substrates are investigated using scanning electron-and cathodoluminescence microscopy, time-resolved and time-integrated photoluminescence spectroscopy as well as gain measurements at 2 K and 300 K. The In content is ranging

Impact of food processing on the structu

Impact of food processing on the structural and allergenic properties of food allergens

✍ E. N. Clare Mills; Ana I. Sancho; Neil M. Rigby; John A. Jenkins; Alan R. Mackie 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 310 KB

## Abstract This article reviews recent studies that address one of the major unanswered questions in food allergy research: what attributes of food or food proteins contribute to or enhance food allergenicity?