SEMI-CRYSTALLINE POLYOLEFIN COMPOSITION, METHOD OF PRODUCING THE SAME, AND ARTICLES MADE THEREFROM
申请人:Van Heeringen Mark J.M.
公开号:US20130030100A1
公开(公告)日:2013-01-31
A semi-crystalline polyolefin composition comprising: a thermoplastic crystallizable polyolefin; and one or more di-alkyl bis-oxalamide compounds having the formula:
wherein R
1
is a spacer group and each R
2
is a peripheral group and wherein each of R
1
and R
2
a
and R
2
b
is an independently selected hydrocarbyl group is provided. Also provided are a method for producing the semi-crystalline polyolefin composition and articles made therefrom.
Semi-crystalline polyolefin composition, method of producing the same, and articles made therefrom
申请人:Van Heeringen Mark J. M.
公开号:US08680186B2
公开(公告)日:2014-03-25
A semi-crystalline polyolefin composition comprising: a thermoplastic crystallizable polyolefin; and one or more di-alkyl bis-oxalamide compounds having the formula:
wherein R1 is a spacer group and each R2 is a peripheral group and wherein each of R1 and R2a and R2b is an independently selected hydrocarbyl group is provided. Also provided are a method for producing the semi-crystalline polyolefin composition and articles made therefrom.
The invention provides for a process for preparing a lubricating grease. The process can be carried out in the presence of a base oil and avoids the use of diisocyanate reagents.
本发明提供了一种制备润滑脂的工艺。该工艺可在有基础油的情况下进行,并避免使用二异氰酸酯试剂。
Synthesis, morphology and properties of segmented poly(ether ester amide)s comprising uniform glycine or β-alanine extended bisoxalamide hard segments
作者:Niels J. Sijbrandi、Ad J. Kimenai、Edwin P.C. Mes、René Broos、Georg Bar、Martin Rosenthal、Yaroslav I. Odarchenko、Dimitri A. Ivanov、Jan Feijen、Pieter J. Dijkstra
DOI:10.1016/j.polymer.2012.07.015
日期:2012.8
Segmented poly(ether ester amide)s comprising glycine or beta-alanine extended bisoxalamide hard segments are highly phase separated thermoplastic elastomers with a broad temperature independent rubber plateau. These materials with molecular weights, M-n, exceeding 30 x 10(3) g mol(-1) are conveniently prepared by polycondensation of preformed bisester-bisoxalamides and commercially available PTHF diols. FT-IR revealed strongly hydrogen bonded and highly ordered bisoxalamide hard segments with degrees of ordering between 73 and 99%. The morphology consists of fiber-like nano-crystals randomly dispersed in the soft polymer matrix. The micro-structural parameters of the copolymers were addressed by simultaneous small- and wide-angle X-ray scattering. It is shown that the crystals have strictly identical thickness, which is close to the contour length of the hard segment. The long dimension of the crystals is identified with the direction of the hydrogen bonds. The melting transitions of the hard segments are sharp, with temperatures up to 170 degrees C. The studied polymers have an elastic modulus in the range of 139-170 MPa, a stress at break in the range of 19-31 MPa combined with strains at break of higher than 800%. The segmented copolymer comprising the beta-alanine based bisoxalamide hard segment with a spacer of 6 methylene groups has a melting transition of 141 degrees C which is higher than the melting transition of its glycine analogue of 119 degrees C. Likewise, the fracture stress increased from 22 to 31 MPa when the glycine ester group in the hard segment was replaced with beta-alanine. The improved thermal and mechanical properties of the latter polymers is related to the crystal packing of the beta-alanine based hard segments in the copolymer compared to the packing of the hard segments comprising glycine ester groups. (C) 2012 Elsevier Ltd. All rights reserved.