QUANTITATIVE ASSESSMENT OF THE BRANCHING ARCHITECTURE OF EPDM WITH HIGH CONTENT OF 5-VINYL-2-NORBORNENE AS THIRD MONOMER

被引：3
|
作者：
Dullaert, Konraad [1 ]
Van Doremaele, Gerard [2 ]
Van Duin, Martin [2 ]
Dikland, Herman [2 ]
机构：
[1] DSM Engn Plast BV, Geleen, Netherlands
[2] Lanxess Elastomers BV, NL-6160 BC Geleen, Netherlands
来源：
RUBBER CHEMISTRY AND TECHNOLOGY | 2013年 / 86卷 / 04期
关键词：
RHEOLOGY;
D O I：
10.5254/rct.13.87946
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The branching architecture of high-molecular-weight EPDM polymers with high amounts of 5-vinyl-2-norbornene (VNB) as a third monomer, produced using recently developed Keltan ACE (TM) technology, was assessed by means of the dilution rheology method proposed by Crosby et al.(1) and compared with conventional Ziegler-Natta EPDM grades. First, the dilution rheology results were converted into a single convenient parameter, called the dilution slope. Next, by combining the dilution rheology results with gel permeation chromatography data and assuming trifunctional branching points, we calculated the volume fraction of the branched polymer, the average molecular weight between branching points, and the branching density. It is shown that the high-VNB polymers studied contained a significantly higher amount of branch-on-branch structures.
引用
收藏
页码：503 / 520
页数：18
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