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首页> 外文期刊>Polimery >Structural transformations of anisotactic polypropylene submitted to low-frequency plasma treatment
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Structural transformations of anisotactic polypropylene submitted to low-frequency plasma treatment

机译：进行低频等离子体处理的各向异性聚丙烯的结构转变

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Anisotactic pp was prepared over the rac-Et (Ind)2ZrC12- MAD catalyst system and pp films were treated with a low-frequency (50 Hz) glow discharge plasma. The treatment resulted in whole-volume structural mo,difications whose extent was related to the initial a-/y-phase ratio in originql PP. At y-phase contents :s; 60%, nearly all the y- became the a-phase, the m. p. of the pp treated rose (from 130°C to 164°C, Table 2), isotactic pentad fraction rose r3c NMR spectra, Table 5), stereoregularity in- creased (IR spectra, Table 4), and MW and MWD rose (Table 6). The pp treated thus acquired the properties of a pp prepared over heterogeneol!;; Ziegler-Natta catalysts. As the y-phase content was raised to 72%, only 10% of the y- turned into the a-phase. At y-phase contents ; 80%, the pp re- mained unaffected. The VUV component of the low frequency discharge plasma is believed to be responsible for the modifications observed. The vuv is believed to be too weak to modify pp containing high y-phase proportions.
机译：在rac-Et（Ind）2ZrC12-MAD催化剂体系上制备了各向异性的pp，并用低频（50 Hz）辉光放电等离子体处理了pp膜。该处理导致整体体积的结构化修饰，其程度与起源ql PP中的初始a / y相比有关。在y相含量：s; 60％，几乎所有的y-都变成了a相，即m。 p。 pp处理的玫瑰（从130°C至164°C，表2），全同立构五单元组分玫瑰r3c NMR光谱，表5），立体规整度增加（IR光谱，表4）以及MW和MWD上升（表5） 6）。因此，经处理的pp获得了在杂多醇上制备的pp的性质。齐格勒-纳塔催化剂。当y相含量提高到72％时，只有10％的y相变成a相。在y相含量; 80％的pp保持不变。低频放电等离子体的VUV成分被认为是所观察到的修饰的原因。人们认为vuv太弱了，无法修改含有高y相比例的pp。

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