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首页> 外文期刊>Open Journal of Organic Polymer Materials >Significant Improvement of Mechanical Properties for Polyvinyl Alcohol Film Prepared from Freeze/Thaw Cycled Gel
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Significant Improvement of Mechanical Properties for Polyvinyl Alcohol Film Prepared from Freeze/Thaw Cycled Gel

机译：冻结/融化循环凝胶制备的聚乙烯醇薄膜的机械性能的显着改善

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摘要

The mechanical properties of polyvinyl alcohol (PVA) films prepared by evaporating water from freeze/thaw cycled gel were investigated as a function of the number of freeze/thaw cycles. The maximum stress of the PVA film prepared by freeze/thaw cycling was larger than that prepared without the freeze/thaw cycle process. The largest maximum stress was 46.2 MPa for a film prepared with 10 freeze/thaw cycles, which was twice as large as that for a cast PVA film without freeze/thaw cycling (22.3 MPa). This is due to the formation of small crystallites during the freeze/thaw cycle process. Furthermore, when the film was annealed at 130°C, the maximum stress was as high as 181 MPa which was comparable to that for PVA films prepared using additives. The crystallinity is not the main factor that determines the maximum stress for either the non-annealed or annealed freeze/thaw cycled films, but the glass transition temperature is well correlated with the maximum stress, irrespective of the annealing process. This is due to the different molecular morphology; the non-annealed freeze/thaw cycled film consists of many small crystallites, but the annealed film consists of larger crystallites formed during the annealing process.
机译：研究了通过从冻融循环的凝胶中蒸发水而制备的聚乙烯醇（PVA）薄膜的机械性能与冻融循环次数的关系。通过冷冻/解冻循环制备的PVA膜的最大应力大于没有冷冻/解冻循环过程制备的PVA膜的最大应力。对于具有10次冷冻/解冻循环的薄膜，最大最大应力为46.2 MPa，是没有冷冻/解冻循环（22.3 MPa）的流延PVA薄膜的两倍。这是由于在冷冻/融化循环过程中形成了小的微晶。此外，当膜在130℃下退火时，最大应力高达181MPa，这与使用添加剂制备的PVA膜的最大应力相当。结晶度不是决定未退火或退火的冻融循环膜的最大应力的主要因素，但是玻璃化转变温度与最大应力具有良好的相关性，而与退火过程无关。这是由于分子形态不同所致。非退火的冻融循环膜由许多小晶粒组成，而退火膜则由在退火过程中形成的较大的晶粒组成。

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