n.聚甲烯(環(huán)烷烴；聚亞甲基)

In this paper, fourth moment of end-to-end distance of polymethylene chains in the third-order interaction approximation is calculated. 本文用三級相互作用近似理論導出了高分子鏈末端距的四次矩的計算公式。

It is concluded that the polymethylene is in full extended trans conformation both in the crystalline and in the liquid crystalline phases when the spacer units are longer than 8. 結果表明,芳香共聚酯熱致性液晶中液晶基元之間的相互作用很強而柔性間隔鏈之間的相互作用很弱。柔性間隔鏈段主要是伸直的反式構象。

So a rapid drop of molecular weight should be observed at the small dose.This is demonstrated by the result of [17] of irradiated polymethylene terephthalates. 特別是在輻照初期很低劑量范圍內

The purpose of polymethylene polyphenyl polyamines purification system is to get rid of anilin and water.The stripping tower and drying tower are two main separation units in the system. 多胺精制系統(tǒng)的任務是脫除粗多胺中的苯胺和水,針對現(xiàn)有工藝存在的精制效果差、消耗高等問題,分別對影響汽提塔和干燥塔的因素進行了模擬分析,提出了相應的改進措施。

The feasibility of manufacturing rice-straw particleboard was discussed when UF resin or the mixtures of UF resin and polymethylene diphenyldiisocyanate (PMDI) were used as binders. 探討了以腺醛(UF)膠和以異氰酸酯(PMDI)改性的UF膠制造稻草刨花板的可行性。