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首页> 外文期刊>Polymers for advanced technologies >Oxygen barrier properties of organic montmorillonite modified polyamide 11/Poly (vinyl alcohol) films
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Oxygen barrier properties of organic montmorillonite modified polyamide 11/Poly (vinyl alcohol) films

机译：有机蒙脱石改性聚酰胺11 /聚（乙烯醇）薄膜的氧气阻隔性能

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摘要

Organic montmorillonite (OMMT) nano-platelets were exfoliated and well dispersed in fully bio-based polyamide 11/Poly(vinyl alcohol) (PA11/PVA) blends. Significantly lower oxygen permeation rates (OTR) were detected for the PA11(72.5)PVA(27.5)OMMT(x)films than those of PA11 and PA11(72.5)PVA(27.5)films. An extremely low OTR of 0.218 cm(3)/m(2)center dot day center dot atm was found for PA11(72.5)PVA(27.5)OMMT(1)film modified with 1 PHR optimum concentration of well dispersed OMMT nano-platelets. Similarly, the free volume characteristics evaluated for PA11(72.5)PVA(27.5)OMMT(x)film series reduced to a minimum as the OMMT concentration reached the optimum value. As revealed by dynamic mechanical and differential scanning calorimetric analyses of PA11(72.5)PVA(27.5)OMMT(x)film series, all dynamic glass transition temperature (T-g), melting temperature (T-m) and percentage crystallinity (W-c) values of PA11(72.5)PVA(27.5)OMMT(x)films were noticeably higher than those of PA11(72.5)PVA(27.5)film without addition of OMMT. In fact,T(g)s,T(m)s andW(c)s evaluated for PA11(72.5)PVA(27.5)OMMT(x)films increased to a maximum, as their OMMT reached the optimum concentration. The considerably enhanced oxygen barrier resistance found for PA11(72.5)PVA(27.5)OMMT(x)films was ascribed to the considerably reduced free volume characteristics and much longer permeation path caused by impermeably OMMT nano-platelets well dispersed in PA11(72.5)PVA(27.5)OMMT(x)films.
机译：将有机蒙脱土（OMMT）纳米血小板剥离并充分分散在完全生物基聚酰胺11/聚乙烯醇（PA11/PVA）共混物中。PA11（72.5）PVA（27.5）OMMT（x）膜的氧渗透速率（OTR）显著低于PA11和PA11（72.5）PVA（27.5）膜。用1份最佳浓度的分散良好的OMMT纳米血小板改性PA11（72.5）PVA（27.5）OMMT（1）膜，发现其OTR极低，为0.218cm（3）/m2中心点-日中心点atm。类似地，当OMMT浓度达到最佳值时，PA11（72.5）PVA（27.5）OMMT（x）膜系的自由体积特性降至最低。通过对PA11（72.5）PVA（27.5）OMMT（x）膜系的动态力学和差示扫描量热分析，PA11（72.5）PVA（27.5）OMMT（x）膜系的所有动态玻璃化转变温度（T-g）、熔融温度（T-m）和结晶度百分比（W-c）值均显著高于未添加OMMT的PA11（72.5）PVA（27.5）膜系。事实上，PA11（72.5）PVA（27.5）OMMT（x）薄膜的T（g）s、T（m）s和W（c）s随着OMMT达到最佳浓度而增加到最大值。PA11（72.5）PVA（27.5）OMMT（x）薄膜的阻氧性能显著增强，这是由于不透水的OMMT纳米片充分分散在PA11（72.5）PVA（27.5）OMMT（x）薄膜中，导致自由体积特性显著降低，渗透路径更长。

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