Semiaromatic polyamides belong to a large family of polymers commonly utilized in demanding engineering applications due to a unique set of outstanding mechanical properties as well as in terms of thermal and chemical resistance. Somewhat less understood is the use of certain members of this family in packaging applications such as the manufacturing of films and sheets or thin-walled containers, as well as the motivations and limitations in designing film structures containing them. This article reviews how m-xylylene diamine (MXD)-based polyamides are used in packaging applications. Attention is also given to film manufacturing and criticalities in its processing. Recent developments in MXD-based polyamides for gas barrier applications are also reported, while examining future perspectives in speciality film manufacturing. The new described copolymers based on MXD6 were synthesized by introducing different co-units, like isophthalic acid, 2,6-naphthalenedicarboxylic acid, glutaric acid, oxalic acid or 1,6-hexamethylene diamine. The performed characterization analyses (DMTA, DSC, density and OTR) allowed the polymer structures and properties to be correlated. Introducing 2,6-naphthalenedicarboxylic acid along the MXD6 chain led to the highest Tg (101°C) and density (1.233 g/cm3) and the lowest OTR (0.0035 cm3·cm/m2·day·atm, up to one order of magnitude lower).

中文翻译：

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薄膜制造中的 MXD6：新型共聚酰胺合成和表征的最新技术和最新进展

半芳族聚酰胺属于一大类聚合物，通常用于要求严苛的工程应用，因为它具有一组独特的出色机械性能以及耐热性和耐化学性。不太了解的是该家族的某些成员在包装应用中的使用，例如薄膜和片材或薄壁容器的制造，以及设计包含它们的薄膜结构的动机和限制。本文回顾了基于间苯二甲胺 (MXD) 的聚酰胺如何用于包装应用。还关注薄膜制造及其加工过程中的关键性。还报告了用于气体阻隔应用的基于 MXD 的聚酰胺的最新进展，同时研究了特种薄膜制造的未来前景。新描述的基于 MXD6 的共聚物是通过引入不同的共单元合成的，如间苯二甲酸、2,6-萘二甲酸、戊二酸、草酸或 1,6-六亚甲基二胺。进行的表征分析（DMTA、DSC、密度和 OTR）允许将聚合物结构和性能关联起来。沿 MXD6 链引入 2,6-萘二甲酸导致最高的 Tg (101°C) 和密度 (1.233 g/cm3) 和最低的 OTR (0.0035 cm3·cm/m2·day·atm，高达 1 个数量级)幅度较低）。密度和 OTR）允许聚合物结构和性能相关联。沿 MXD6 链引入 2,6-萘二甲酸导致最高的 Tg (101°C) 和密度 (1.233 g/cm3) 和最低的 OTR (0.0035 cm3·cm/m2·day·atm，高达 1 个数量级)量级较低）。密度和 OTR）允许聚合物结构和性能相关联。沿 MXD6 链引入 2,6-萘二甲酸导致最高的 Tg (101°C) 和密度 (1.233 g/cm3) 和最低的 OTR (0.0035 cm3·cm/m2·day·atm，高达 1 个数量级)量级较低）。