聚氨酯弹性体结构对阻尼性能及力学性能的影响
Effects of structure on damping properties and mechanical properties of polyurethane elastomers
刘宁 1周青 2刘海蓉 2韩艳 2夏宇正1
作者信息
- 1. 北京化工大学材料科学与工程学院，北京市 100029
- 2. 北京科聚化工新材料有限公司，北京市 102200
- 折叠
摘要
以不同相对分子质量的聚氧化丙烯二醇（PPG）为软段，不同异构体的二苯基甲烷二异氰酸酯（MDI）、甲苯二异氰酸酯（TDI），以及扩链剂新戊二醇（NPG）、三羟甲基丙烷（TMP）、1,4-丁二醇（BDO）为硬段，采用预聚法合成了聚氨酯弹性体，并对其损耗因子（tanδ）与力学性能进行了测试。结果表明：随着4,4＇-MDI含量的增加，聚氨酯弹性体的tanδ曲线峰高降低，即阻尼性能下降，力学性能提高；随着2,4-TDI含量的增加，阻尼性能提高，力学性能降低；扩链剂TMP含量增加，tanδ峰向高温方向移动；扩链剂NPG含量增加，阻尼性能提高；软段相对分子质量增大，tanδ峰向低温移动，PPG相对分子质量从400增加到2?000时，tanδ峰的位置从80?℃变化到-20?℃左右。
Abstract
Polyurethane(PU)?elastomers?were?synthesized?from?polyether-diol(PPG)?with?different?relative?molecular?mass?as?a?soft?segment,?different?isomer?methylenebis(phenyl?isocyanate)(MDI)?or?toluene?diisocyanate (TDI),?and?chain?extender?neopentyl?glycol(NPG),?tri(hydroxymethyl)propane(TMP)?and?1,4-butanediol(BDO)?as?hard?segments?by?two-step?bulk?polymerization?process.?The?loss?tangent(tanδ)?and?mechanical?properties?of?the?PU?elastomers?were?tested.?The?results?indicate?that?the?peak?of?the?tanδ?curve?of?the?PU?elastomers?lowers,?and?there-fore?the?damping?properties?of?the?PU?elastomers?are?weaken?and?the?mechanical?properties?of?the?PU?elastomers?are?enhanced?with?increasing?the?content?of?4,4'-MDI?isomer.?The?PU?elastomers'damping?properties?improve?while?their?mechanical?properties?decline?with?the?rise?in?the?content?of?2,4-TDI?isomer.?The?tanδ?peak?of?the?PU?elastomers?moves?towards?the?high-temperature?end?with?the?augmentation?of?the?content?of?chain?extender?TMP.?The?damping?properties?are?improved?with?the?increase?in?the?content?of?chain?extender?NPG.?The?tanδ?peak?of?the?PU?elastomers?moves?to?the?low-temperature?end?with?raising?the?relative?mo lecular?mass?of?the?soft?segment.?The?tanδ?peak?shifts?from?80?℃?to?about?-20?℃?when?the?relative?molecular?mass?of?PPG?rises?from?400?to?2?000.
关键词
聚氨酯/阻尼性能/力学性能/异构体Key words
polyuerthane/damping property/mechanical property/isomer引用本文复制引用
出版年
2013
NETL
NSTL
维普
万方数据