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聚异丁烯(PIB)具有优异的耐介质性能,作为化工添加剂被广泛应用于各种化工材料,将聚异丁烯应用于胶黏剂及密封胶可有效稳定黏度,降低黏温性;同时促进粘接,提高耐介质性能,增加低温下的柔韧性。研究了4种不同的聚异丁烯在单组分室温硫化硅橡胶(RTV-1)中的应用。通过在RTV-1中添加不同相对分子质量的PIB,重点考查PIB对于RTV-1拉伸强度、伸长率及耐介质老化性能的影响。结果发现,添加PIB所制得的RTV-1拉伸强度可达2MPa,伸长率370%左右,同时耐机油、耐水性、耐热氧老化性能优异。 相似文献
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用凝胶渗透色谱仪(GPC)来测定阳离子聚合法得到的聚异丁烯,可以验证电子对给予体吡啶对T—BA/TiCl_4/IB/CH_2Cl_2体系的阳离子聚合的影响。 相似文献
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《国际聚合物材料杂志》2012,61(8):633-644
Polymeric materials are known to be more or less dispersive and absorptive. Dispersion has a consequence that the dynamic modulus is frequency dependent, and absorption is exhibited by the fact that these materials have the ability to absorb energy under vibratory motion. The phenomenon of dispersion in conjunction with the powerful notion of complex Modulus of Elasticity (MOE), permits to establish the relation between the real and the imaginary components of the MOE, that is, respectively the Storage and loss moduli. The loss factor is simply determined through taking the Ratio of these two MOE components. The theoretical background for the interrelations between the Storage modulus and the loss modulus is found in the Kramers-Kronig relations. However, due to the mathematical difficulties encountered in using the exact expressions of these relations, approximations are necessary for applications in practical situations. On the other hand, several simple models have been proposed to explain the viscoelastic behavior of materials, but all fail in giving a full account of the phenomenon. Among these models, the standard viscoelastic model, better known as the Zener model, is perhaps the most attractive. To improve the performance of this model, the concept of fractional derivates has been incorporated into it, which results in a four-parameter model. Applications have also shown the superiority of this model when theoretical predictions are compared to experimental data of different polymeric materials. The aim of this article is to present the results of applying this model to rubber, both natural and filled, and to some other selected more general polymer. 相似文献
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Takeshi Kuroki Takashi Sawaguchi Kazumasa Suzuki Shoaki Ide Tadashi Ikemura 《Polymer》1983,24(4):428-432
The distribution of double bonds in thermally degraded polyisobutylene was determined quantitatively by using pulsed Fourier transform 1H n.m.r. spectroscopic analysis. The double bonds in the degraded polymer did not exist in the interior but at the terminal positions of the polymer chain. These olefins were of the terminal trisubstituted and terminal vinylidene types. The content of the former was much greater than that of the latter. This shows that radical chain transfer predominantly occurs at the methylene hydrogen rather than at the methyl groups of the polymer chain. The average number of double bonds per molecule, f, was greater than 1 and tended to be near 2. Thereby most of the degraded polyisobutylene was shown to have two terminal unsaturations per molecule. 相似文献
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以高活性聚异丁烯(PIB)和苯酚为原料(C6H5OH),三氟化硼乙醚为催化剂合成了聚异丁烯苯酚,然后加入P2O5对其进行酯化反应合成聚异丁烯磷酸酯。通过红外光谱(FT-IR)分别对合成的聚异丁烯苯酚和聚异丁烯磷酸酯进行了分析,结果表明产物为预期产物。通过差示扫描热分析(DSC),表明聚异丁烯苯酚与高活性聚异丁烯相比具有较高的热稳定性。通过产物与大庆原油进行降凝效果的测定,证实聚异丁烯磷酸酯在大庆原油中的加入量为0.6%时降凝效果最好,降幅为9℃。 相似文献
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