Polymer nanocomposite (PNC) films comprised poly(vinyl alcohol) (PVA) and also its blend with poly(vinyl pyrrolidone) (PVP) (i.e., PVA/PVP = 75/25 wt/wt%) as host matrices loaded with different amounts of montmorillonite (MMT) nanoclay up to 10 wt% were prepared by melt compounded method. X-ray diffraction (XRD) patterns of these PNC films were recorded in the appropriate angular range of 2θ values 3.8°–26° for their crystalline phase structural characterization. In comparison to the broader-type single diffraction peak for the aqueous solution cast prepared pure PVA film and that of the PVA/PVP blend film which is attributed to the hydrogen bonded isotactic and syndiotactic PVA crystals, five sharp diffraction peaks of different intensities corresponding to the evolution of various crystallites in the melt compounded PVA and PVA/PVP blend films were observed. Further, these peaks intensities were found significantly affected by the amounts of loaded MMT in these polymer matrices-based nanocomposites. It was observed that the prominent crystalline phase of the pure PVA converted into alternative tactic phases in the PVA/MMT films with the variation of MMT concentration. The prime crystalline phase of the PVA/PVP/MMT nanocomposites underwent alternative crystal structures formation abruptly on the initial loading of the 1 wt% amount of MMT in the PVA/PVP blend matrix reflecting a substantial alteration in the direction and nature of hydrogen bonding within the PVA crystal structures, and less changes were found with the further increase of MMT concentration up to 10 wt%. The effect of MMT loading on the crystallite sizes, degree of crystallinity, and the exfoliated and intercalated MMT structures in these PNC materials were analyzed in detail.

中文翻译：

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熔融复合PVA / MMT和PVA / PVP / MMT纳米复合材料的晶相和结晶度的研究

聚合物纳米复合材料（PNC）膜包含聚乙烯醇（PVA）以及与聚乙烯吡咯烷酮（PVP）的共混物（即通过熔融复合法制备了负载有不同含量高达10 wt％的蒙脱土（MMT）纳米粘土的基质作为PVA / PVP = 75/25 wt / wt％）。这些PNC膜的X射线衍射（XRD）图案记录在2θ值为3.8°–26°的适当角度范围内，以表征其晶相结构。与水溶液铸成的纯PVA膜和归因于氢键等规和间规PVA晶体的PVA / PVP共混膜的宽型单衍射峰相比，五个强度不同的尖锐衍射峰分别对应于观察到熔融混合的PVA和PVA / PVP共混膜中各种微晶的演变。进一步，发现这些峰强度受这些基于聚合物基质的纳米复合材料中MMT负载量的显着影响。观察到，随着MMT浓度的变化，纯PVA的显着结晶相在PVA / MMT膜中转变为可替换的战术相。PVA / PVP / MMT纳米复合材料的初晶相在PVA / PVP共混物基质中加入1 wt％的MMT时，突然发生了交替的晶体结构形成，反映了氢键的方向和性质发生了实质性变化PVA晶体结构，随着MMT浓度进一步增加至10 wt％，发现变化较小。MMT负载量对微晶尺寸，结晶度，