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51.
The compositional homogeneity of a poly (ethylene terephthalate)-poly (tetramethylene ether) multiblock copolymer sample with low content of hard segment was examined by GPC, TLC, and solubility method. The copolymer sample was found to have a uniform composition as a function of elution volume over the major portion of sample from GPC method. However within one elution fraction, the copolymer chains, although having the same hydrodynamic volume, may have some difference in composition. Two fractions with different composition were obtained by precipitation in ethanol. Some low molar mass copolymers were also separated by a TLC technique from the copolymer sample. 相似文献
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The center line velocity distributions in the convergent flow of a silicone oil as a Newtonian fluid and a solution of silicone rubber ia silicone oil as a non-Newtonian fluid into a rectangular slit of various entrance angles have been measured by means of laser Doppler velocimetry. The non-Newtonian fluid used conformed to the behavior of a power-law fluid at shear rates greater than 20 s~(-1) with a non-Newtonian index n=0.76. The convergent flow studied had a contraction ratio of 12, with slit height of 0.83mm, slit length to height ratio of 18.1, slit width to height ratio of 14.3 and the width to height ratio before entering the slit of 1.19. Flow experiments were done at room temperature with shear rates at the slit wall of (1.7—11)·10~3s~(-1) and generalized Reynolds number 0.21—2.2. No elastic turbulence was observed in front of the slit entrance. The center line velocity gradient along the flow direction was appreciably reduced in the flow cells of small entrance angles. Two new phenomena h 相似文献
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在实验室EXAFS装置上测量了一种导电高聚物——H_2PtCl_6·6H_2O掺杂聚乙炔和模型化合物(K_2PtCl_6)的PtL_Ⅲ吸收谱。用高功率的施转阳极靶X射线发生器(RigakuRU-1000)作为X射线源。观测到的EXAFS数据分析表明, Pt原子在试样中有两种配位状态。一种是PtCl_6~(2-)离子, Pt—Cl键长为0.233 nm, 另一种是Pt在0.228 nm附近有两个最近邻的Cl原子。实验结果提供了支持下述观点的直接结构信息: 随着电子从(CH)_x链向铂盐的转移, 发生下列反应:2H_2PtCl_6+2e~-→PtCl_6~(2-)+PtCl_2+4HCl 相似文献
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Rubber of high molar mass, like cis-polybutadiene, shows a stress peak on theenineering stress-strain curve during stretching at room temperature. In this work cis-polybutadiene samples were swollen in a poor solvent, CHCl_3/EtOH (1/1 v/v), for differenttimes. It was found that both the initial modulus and the stress peak on stretching de-creased in magnitude with increasing swelling time and the peak disappeared entirely after1 hour of swelling. On further swelling the initial modulus increased somewhat and a smallstress peak re-appeared after swelling for 2 h. The disappearance of the stress peak afterswelling is interpreted as the result of disruption of cohesional entanglements present in theinitial rubber sample. The re-appearance of a small stress peak and the increase of modu-lus on further swelling are interpreted as being of the same nature as the phenomenon ofanti-plasticization. It is the result of forming some new cohesional entanglements of largerbinding energies through longer range chain segmental motions excited after the disruptionof the previously existing cohesional entanglements in the rubber. Thus an understand-ing of the stress peak on stretching a high molar mass rubber and the phenomenon ofanti-plasticization on molecular level has been put forward. 相似文献
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上文中没有说明线路的工作原理,因此可能不易掌握哪些零件的数值是重要的。现在想借这地位给读者作一点补充介绍。这电路在接触控制点间开路时,电子管的工作可以看作一个半波整流器,Re-C_1并联电路是这整流器的负荷。在这负荷两端的交流组份就用来作为栅极的控制电压(经过 C_2及接触点)。因为控制电压利用整流后的交流组份,Re 的旁路电容 C_1的电容量不能太大,太大时 Re 两端交流组份的电压值就会太小。C_1的电容量太小时,电磁继电器的衔铁会振动。1μF 是适当的数值。这时 Re-C_1两端的电压波形和电源电压的关系如附图(录自示波器)。 相似文献
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本文報告測定本所合成研究室用乳液聚合在50°時所製備的丁苯橡膠分子量分佈的結果。我們在1%苯溶液中,加入甲醇作沉澱劑經分級沉澱後,用粘度法測定各級份的分子量。所得分子量分佈曲線,在分子量等於50,000處有一個明顯的高峯,與前人的結果相符合。特性粘數[η]>3的級份,從它們的溶解度和在甲苯溶液中的粘度數據,我們認為有顯著的支鏈和交聯的存在,約佔試樣的25%。甲苯溶液的粘度數據指示在[η]<3時,k′=0.36,與分子量無關,而且k′+β=1/2;當[η]>3時,k′值顯著地增大,而且k′+β>1/2。 這些差異的大小,我們認為可以看作丁苯橡膠分子支鏈或交聯程度的一種量度。 從本實驗所得的丁苯橡膠的分子量分佈曲線,我們建議同時用■和■來做橡膠的品質指示。 相似文献