Optical properties of blown and cast polyethylene films: Surface versus bulk structural considerations

Johnson, Matthew B.; Wilkes, Garth L.; Sukhadia, Ashish M.; Rohlfing, David C.

doi:10.1002/1097-4628(20000923)77:13<2845::aid-app6>3.0.co;2-7

Cited by 66 publications

(31 citation statements)

References 35 publications

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“…This suggests that, in general, these films do not have well‐defined, row‐nucleated structure or there are some groups of small lamellar stacks, which are ill‐defined, localized row‐nucleated structures. Others have also observed that there is no obvious row‐nucleated morphology in LLDPE blown films 21, 27. According to the combined observations from WAXD pole figures, SAXS and TEM, it seems that a mixed morphological model of ill‐defined, row‐nucleated structure and a ‐axis structure needs to be used to describe the morphological texture.…”

Section: Resultsmentioning

confidence: 99%

Orientation and property correlations for LLDPE blown films

Chen

Bishop

Landes

et al. 2006

J of Applied Polymer Sci

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SUMMARY:The orientation and property correlations of biaxially oriented polyethylene (PE) blown films have been studied. A linear low density polyethylene (LLDPE) (DOWLEX™ 2045A) was used to fabricate films at different conditions with blow up ratio, die gap, and frost line height as the variables. The White-Spruiell orientation factors of crystal unit cells, amorphous chains, and Herman's orientation factors of lamellae were determined from wide-angle X-ray diffraction pole figure, birefringence, and small angle X-ray scattering (SAXS). A general orientation pattern with the crystal unit cell a-axis preferentially oriented to MD, b-axis to TD, lamellae stacking along the MD, and amorphous chains preferentially to the MD has been found for all films in this study. A correlation between the orientation of each element of the morphology hierarchy has been revealed. Key mechanical properties including dart impact and Elmendorf tear strength in both MD and TD have been determined. Good correlation has been found among these properties. Most importantly, these properties have excellent correlation to the orientation. These correlations have been linked to underlying morphology and microdeformation mechanisms.

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Section: Resultsmentioning

confidence: 99%

Orientation and property correlations for LLDPE blown films

Chen

Bishop

Landes

et al. 2006

J of Applied Polymer Sci

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“…The super-molecular structure, including the crystallinity, and the morphology and orientation of the crystals of blown films of polyethylene (PE) have been extensively studied [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Typically, blown films of PE are semicrystalline with a maximum degree of crystallinity, which depends on the molecular architecture/branching-characteristics.…”

Section: Introductionmentioning

confidence: 99%

Structure of blown films of polyethylene/polybutene‐1 blends

Nase¹,

Funari²,

Michler³

et al. 2009

Polymer Engineering & Sci

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The structure of blown films of blends of low-density polyethylene (PE-LD) and isotactic polybutene-1 (iPB-1) with different content of iPB-1 was investigated using wide-and small-angle X-ray scattering (WAXS and SAXS), transmission electron microscopy (TEM), and polarizing optical microscopy (POM). TEM proves formation of a matrix-particle phase structure due to immiscibility of the blend components. Within the iPB-1 particles, needle-like crystals with c-axis orientation were observed. The PE-LD matrix showed two populations of crystals. WAXS data indicate that the majority of crystals were oriented with the c-axis perpendicular to machine direction (MD), while SAXS data prove additional presence of stacks of lamellae, oriented parallel to MD. Quantitative birefringence measurements showed that the majority of molecule segments were oriented in the direction of the circumference of the film, confirming the WAXS data. The crystal orientation has direct impact on mechanical properties, which was demonstrated by measurement of the anisotropy of the modulus of elasticity. POLYM. ENG. SCI., 50:249-256, 2010.

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“…The surface morphology of the samples were depends on the degree of the interfacial behaviour, and the nucleation 11 . Micrograph in Fig.…”

Section: Phase Morphology and Structure Of Nanocompositesmentioning

confidence: 99%

Utilisation of Nanosize Powder (Montmorillonite) for Compounding Lightweight Polymer Products

Rukman¹,

Sa'ad²,

Dahan³

2012

Orientjchem.

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In this study, polymer nanocomposites were prepared using various nanosized powder clay content (montmorillonite) and compatibilizers. The compatibilizers used in this research were maleic anhydride(MA). The importance of this compatibilizer was also discussed. Polypropylene(PP)/ montmorillonite(MMT) were prepared by compounding process and was fabricated by using injection moulding machine. The effect of structure properties of the compatibilization of the clay dispersion and clays amount on the microstructure of the nanocomposite were investigated. Microstructural characterization of the samples was characterized by Field Emision Scanning electron microscopy (FESEM). The results of this research were expected to produce a lightweight and strong material with homogeneized microstructure and improved mechanical properties that suitable for application of aircraft interior parts or handicap products.

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Optical properties of blown and cast polyethylene films: Surface versus bulk structural considerations

Cited by 66 publications

References 35 publications

Orientation and property correlations for LLDPE blown films

Orientation and property correlations for LLDPE blown films

Structure of blown films of polyethylene/polybutene‐1 blends

Utilisation of Nanosize Powder (Montmorillonite) for Compounding Lightweight Polymer Products

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