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首页> 外文期刊>Journal of Applied Polymer Science >Thermal crosslinking of cis-1,4-polybutadiene at ultrahigh pressures
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Thermal crosslinking of cis-1,4-polybutadiene at ultrahigh pressures

机译：顺式1,4-聚丁二烯在超高压下的热交联

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摘要

cis-1,4-Polybutadiene (BR) samples, in the absence of crosslinking agents, were simultaneously compressed by ultrahigh pressures (>4.0 GPa) and annealed between 25 and 180 degrees C. The BR samples were crosslinked when the annealing temperatures were above 100 degrees C. The Vickers microhardness of the treated BR increased and the extent of swelling decreased rapidly as the annealing temperature increased, indicating that the crosslinking density increased. Solid-state carbon-13 nuclear magnetic resonance and Fourier transform infrared spectroscopy results showed that some C=C bonds in the BR were opened to form the crosslinking network structures with C-C Linkages and that a partial cis-trans isomerization took place during the treatments. Differential scanning calorimetry studies revealed that the glass transition temperature increased and the crystallinity decreased as the annealing temperature increased. When the annealing temperature exceeded 140 degrees C, the treated BR samples lost their rubbery elastic characteristics completely and became brittle materials. (C) 1998 John Wiley & Sons, Inc. [References: 24]
机译：在没有交联剂的情况下，顺式-1,4-聚丁二烯（BR）样品同时被超高压（> 4.0 GPa）压缩并在25至180摄氏度之间退火。当退火温度高于25摄氏度时，BR样品发生交联100℃。随着退火温度的升高，处理的BR的维氏显微硬度增加并且溶胀程度迅速降低，表明交联密度增加。固态碳13核磁共振和傅里叶变换红外光谱结果表明，BR中一些C = C键被打开，形成带有C-C键的交联网络结构，并且在处理过程中发生了部分顺反异构化。差示扫描量热法研究表明，随着退火温度的升高，玻璃化转变温度升高，结晶度降低。当退火温度超过140℃时，经处理的BR样品完全失去其橡胶弹性特性，并变成脆性材料。 （C）1998 John Wiley＆Sons，Inc. [参考：24]

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