乙烯和醋酸乙烯共聚物在人工汗液存在下的光老化。二。进化形态学

C. Dubois, V. Rigny-Bourgeois, A. Chambaudet
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引用次数: 1

摘要

乙烯和醋酸乙烯酯(EVA)的共聚物在一个有这种效果的细胞中,在人工汗液的存在下进行了photovielli。此外,光老化是在没有人工汗水的情况下进行的,以保证这种基质的作用。类似的研究也在这种含有光稳定剂的EVA上进行。用差示扫描量热法研究了结晶相的形态演变,主要是监测与熔合峰相对应的温度演变,其次是玻璃化转变温度和熔合焓。从而感染流行性感冒的动物,有可能结晶团队设计两个阶段的eva九个盛产的理由之一,乙酸乙烯(VA)和另一种富含理由:聚乙烯(PE)、温度、行动和魁松光解和汗水,存在或缺少稳定剂。= =地理= =根据美国人口普查,这个县的面积为,其中土地面积为,其中土地面积为。在这个细胞中,聚乙基共乙烯醋酸酯(EVA)被拍摄下来。另一方面,为了了解这种物质的作用,在没有人工汗的情况下进行了光aging。类似的研究也在光稳定的EVA中进行。形态进化of The crystalline圣母polymer was studied by微分结构,扫描calorimetry咸水的进化》,熔点温度,and多少话of The glass)和圣母熔点温度过渡焓。Thus, it was知道可能的重组问题》two in the fresh crystalline结构这娃,rich in the first one聚乙酸乙烯酯(聚乙烯)and the second one in rich in。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Photovieillissement d'un copolymère d'éthylène et d'acétate de vinyle en présence de sueur artificielle. II. Evolution morphologique
Un copolymere d'ethylene et d'acetate de vinyle (EVA) a ete photovielli, en presence de sueur artificielle, dans une cellule amenagee a cet effet. D'autre part, le photovieillissement a ete realise sans sueur artificielle afin d'apprehender le role de ce substrat. Des etudes similaires ont egalement ete conduites sur cet EVA contenant des stabilisants lumiere. L'evolution morphologique des phases cristallines a ete etudiee par calorimetrie differentielle a balayage en suivant, principalement l'evolution des temperatures correspondant aux pics de fusion, et en second lieu celles des temperatures de transitions vitreuses et des enthalpies de fusion. Ainsi, il est possible d'interpreter la reorganisation des deux phases cristallines presentes dans l'EVA neuf, l'une riche en motifs vinyle acetate (VA) et l'autre riche en motifs polyethylene (PE), et de preciser l'action de la temperature, de la photolyse et de la sueur, en presence ou en absence de stabilisants. An artificial photoaging cell was arranged with the goal to study the behaviour of polymers partly immersed in artificial sweat. A poly(ethylene-co-vinyl acetate) (EVA) was photoaged in this cell. On the other hand, photoaging was realized without artificial sweat in order to understand the action of this substrate. Similar studies were carried out with light stabilized EVA. The morphological evolution of the crystalline structures of the polymer was studied by differential scanning calorimetry, mainly the evolution of the melting temperatures, and secondly those of the glass transition temperatures and of the melting enthalpies. Thus, it was possible to understand the reorganization of two crystalline structures contained in the fresh EVA, the first one rich in poly(vinyl acetate) and the second one in rich in polyethylene.
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