Self‐nucleation behaviors of olefinic blocky copolymer/montmorillonite nanocomposites with collapsed and intercalated clay layers

Tong, Zaizai; Huang, Jie; Zhou, Bing; Xu, Jun‐Ting; Fan, Zhiqiang

doi:10.1002/app.41771

Cited by 13 publications

(12 citation statements)

References 43 publications

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“…This fact is advantageous for obtaining a composite with improved mechanical strength, thermal stability, barrier properties, and reduced flammability . However, the small displacement of the second peak of the clay, about 8°, d(002), suggests an increase in the spacing between clay layers, an indication that the clay is partially intercalated in the polymer matrix . Therefore, the results show that the nanoclay is in an intercalated/exfoliated configuration in polymeric films.…”

Section: Resultsmentioning

confidence: 90%

Effect of clay and clay/essential oil in packaging films

Torin

Camani²,

Silva³

et al. 2017

Polymer Composites

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The influence of the different contents of organo‐modified montmorillonite clay (1 and 3%wt.) and two essential oils (Carvacrol and Eugenol ‐ 2 and 6%wt.) when incorporated into low‐density polyethylene films (LDPE) was characterized by X‐ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). This study shows the potential of montmorillonite clay as a carrier of carvacrol and eugenol essential oils, ClayC and ClayE, respectively, into LDPE nanocomposites. To prepare the nanocomposites, oils and clay hybrid were mixed and added to polyethylene using a homogenizer. The clay increased the thermal stability of the essential oils. PE/ClayC and PE/ClayE nanocomposites showed increased crystallinity as a function of the amount of hybrid; this was more significant for the PE/ClayC system. Increased crystallinity suggests that clay acts as nucleating agent, due its intercalated/exfoliated configuration. The results contribute to obtaining a more efficient nanocomposite system for subsequent applications, such as active packaging. POLYM. COMPOS., 39:4034–4040, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 90%

Effect of clay and clay/essential oil in packaging films

Torin

Camani²,

Silva³

et al. 2017

Polymer Composites

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“…14 Zuo et al also investigated the structure evolution during deformation of OBCs at room temperature and compared it with olen random copolymers (ORC); it was found that high 1-octene comonomers in so blocks and low density of non-crystallizable blocks could lead to a less effective network, although they possess similar ethylene-octene composition and overall density. 21,22 However, these approaches can inevitably cause a signicant loss of elasticity. It was reported that the properties are better when processed at temperatures higher than the mesophase separation temperature (TMST).…”

Section: Introductionmentioning

confidence: 99%

The effect of hard block content on the orientation and mechanical properties of olefin block copolymer films as obtainedviamelt stretching

et al. 2015

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In this study, the orientation, structure and mechanical performance of a series of uniaxially oriented films based on olefin block copolymers (OBC) have been investigated in terms of the differences in hard block content and draw ratio (DR). Three OBCs with different hard block contents of 35 wt%, 25 wt% and 12 wt% were used. For un-stretched films, a change from close-packed spherulites into tiny crystallites is observed with decreasing hard block content, accompanied by an almost linear decrease in crystallinity.However, the change in mechanical properties does not follow the same path, with obviously higher tensile strength and modulus for OBC-35, but a lower and almost the same tensile strength and modulus for OBC-25 and OBC-12, in spite of the big difference in hard block content and crystallinity between them. For melt-stretched films, the degree of orientation of the amorphous phase is almost the same and slightly increases with the increase in the draw ratio for the three OBCs, disregarding their hard block contents. Crystalline orientation and shish content are much higher for OBC-35, and an obvious increase is seen as the draw ratio increases from 4.95 to 8, corresponding to the sharp increase in Young's modulus and stress. For OBC-25 and OBC-12, similar crystalline orientation and shish content are seen, which increase linearly with draw ratio and are consistent with the linear increase in modulus and stress as the draw ratio increases. Our study demonstrates the importance of the hard block content of OBC to determine the mechanical properties and the response to external stretching. A critical hard block content exists (in this case 35 wt%), above which a strong network is constructed by the hard block crystalline phase, resulting in a higher tensile strength and modulus. This strong network is destroyed as the draw ratio reaches a certain value (herein, 4.95 to 8), leading to an obvious increase in crystalline orientation, as well as a sharp increase in tensile strength and modulus. When the hard block is below the critical content (herein, 25 wt% and 12 wt%), the network constructed by the hard block is weak and less dependent on its content.

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“…Similar phenomenon was Table 1 The weight percentage of PCL (W PCL ), number-average molecular weight of PCL (M n ), grafting density of PCL (s), gyration radius (R g ) and distance between the adjacent grafted PCL chains (d) in different samples. observed for the olefinic blocky copolymer/montmorillonite nanocomposites in our previous work [28]. This is probably due to the thermal lag in the heating process, as compared with the annealing process in the SN experiments.…”

Section: Self-nucleation Of Mwcnts-g-pcl-6kmentioning

confidence: 84%