Synthesis and characterization of siloxane-containing poly(urea oxamide) segmented copolymers

被引：34
|
作者：
Buckwalter, Daniel J. [1 ,2 ]
Zhang, Mingqiang [1 ,2 ]
Inglefield, David L., Jr. [1 ,2 ]
Moore, Robert B. [1 ,2 ]
Long, Timothy E. [1 ,2 ]
机构：
[1] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA
[2] Virginia Tech, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
来源：
POLYMER | 2013年 / 54卷 / 18期
基金：
美国国家科学基金会;
关键词：
Thermoplastic elastomer; Hydrogen bonding; Polyurea; STRUCTURE-PROPERTY BEHAVIOR; CHAIN EXTENDED POLYUREAS; UNIFORM HARD SEGMENTS; INFRARED TEMPERATURE; UREA COPOLYMERS; SOFT SEGMENT; ORGANOSILOXANE COPOLYMERS; POLYSULFONE COPOLYMERS; COPOLY(ETHER UREA)S; MECHANICAL-BEHAVIOR;
D O I：
10.1016/j.polymer.2013.07.025
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
An unprecedented family of segmented polydimethylsiloxane poly(urea oxamide) (PDMS-UOx) copolymers displayed thermoplastic elastomeric behavior with improved thermomechanical properties compared to PDMS polyurea (PDMS-U) analogs. A two-step, PDMS end-capping sequence using diethyl oxalate and hydrazine generated difunctional oxamic hydrazide capped oligomers. Polymerization with HMDI provided high molecular weight copolymers, which yielded elastomeric films with monodisperse hard segments. Dynamic mechanical analysis (DMA) of PDMS-UOx copolymers revealed a broad, rubbery plateau that extended for >180 degrees C. The PDMS-UOx service window extended similar to 120 degrees C further than a PDMS-U analog, presumably due to enhanced hydrogen bonding and concomitant microphase separation. DSC and WAXD elucidated the amorphous morphology of PDMS-UOx, and DMA, SAXS, and AFM confirmed a well-defined microphase-separated morphology. Incorporation of urea oxamide groups significantly affected microphase separation and thermomechanical properties, and these copolymers offer impact in adhesive and biomedical technologies due to low temperature reaction conditions for unique hydrogen bond containing segmented copolymers. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4849 / 4857
页数：9
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