首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   6篇
  免费   0篇
  国内免费   9篇
化学   3篇
物理学   2篇
综合类   10篇
  2005年   1篇
  2002年   1篇
  2000年   2篇
  1999年   1篇
  1996年   2篇
  1995年   1篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1982年   2篇
排序方式: 共有15条查询结果,搜索用时 15 毫秒
11.
Blends of polyphenylene sulfide (PPS) containing trace amounts of branching and/orcross-linking in chain and Polyamide-66(PA-66) have been prepared by melt blending. Therheological behavior of PPS/PA-66 blends has been studied by means of capillary rheo-meter, and compared with PPS. The effects of shear rate, shear stress and temperature onthe flow of PPS/PA-66 blends and PPS are discussed. The non-Newtonian indexes andthe activation energies of viscous flow are obtained. The results show that the apparentviscosity of PPS/PA-66 blends is not sensitive to shear rate and stress, but decreases withthe elevation of temperature. On the contrary, the apparent viscosity of the PPS decreasesobviously with the increasing of shear rate and shear stress, but it is increased by theelevation of temperatue.  相似文献   
12.
SYNTHESIS AND MORPHOLOGICAL STRUCTURE OF POLY (PHENYLENE SULFIDE AMIDE)   总被引:1,自引:0,他引:1  
Poly (phenylene sulfide amide) (PPSA) has been synthesized by using sulfur as Ssource which reacts with dichlorobenzamide (DCBA) and alkali in polar organic solvent atthe atmospheric pressure. The polymer structures were determined by elemental analysis,FT-IR and ~1H-NMR. It is shown that the yielded polymer has linear structure and itsstructure unit is -p-C_6H_4-CONH-p-C_6H_4-S-. The polymer morphology was studied byX-ray diffraction and polarized microscopy. The results show that PPSA is a crystallinepolymer and its spherulites are the aggregation of nontwisting lamella or micro-threadstructure. Under shearing force, these crystals are dispersed to form micro-fibrillarstructure. The decomposition kinetics of PPSA was also studied at different beating rates.The decomposition energy of PPSA is higher than that of PPS.  相似文献   
13.
在合成和表征不同类型的聚苯硫醚树脂的基础上,对不同类型PPS的流变行为以及各类PPS的结晶度及热历程对不同结构类型PPS的结晶度的影响进行了研究,结果表明,各种聚苯硫醚树脂在相同条件下的流变性能有所不同,各种聚苯硫醚树脂的结晶度,及热历程对其结晶行为的影响也有差异  相似文献   
14.
本文首次应用压缩腔长和适当降低总气压的简单方法,在横向激励(TE)高气压CO_2激光器中获得了单频输出。激光器腔长14cm,激活长度为10cm。气压240Torr,单频输出能量为7mJ。  相似文献   
15.
本文用二氧化碳激光裂解色谱法(CO_2—LPCC)研究了聚对苯二甲酸乙二醇酯(PET)和聚2.6—萘二甲酸乙二醇酯(简称聚萘酯,PEN—2.6)的裂解.分离采用具有弱极性(SE—30)的双分离柱,用模型化合物鉴定了特征裂解产物,根据裂解图谱,探讨了PET和PEN—2.6的裂解机理.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号