Films mechanical properties

Strained set of lattice parameters and calculating the stress from the peak shifts, taking into account the angle of the detected sets of planes relative to the surface (see discussion above). If the assumed unstrained lattice parameters are incorrect not all peaks will give the same values. It should be borne in mind that, because of stoichiometry or impurity effects, modified surface films often have unstrained lattice parameters that are different from the same materials in the bulk form. In addition, thin film mechanical properties (Young s modulus and Poisson ratio) can differ from those of bulk materials. Where pronounced texture and stress are present simultaneously analysis can be particularly difficult. 

The structure of a-C H films may be thus pictured as sp--carbon atoms in condensed aromatic clusters, dispersed in an sp- -rich matrix, which confers to the network its characteristic rigidity. This situation can also be regarded as a random covalent network in which the sp" clusters of a defined size take part in the structure as an individual composed atom with its corresponding coordination number [17]. Such kinds of models have been successfully used to describe the dependence of a-C H film mechanical properties on composition, hybridization, and sp" clustering [23]. 

Owing to a photocatalytic effect, titanium dioxide may interact with certain active substances, e.g. famotidine. Studies have shown that titanium dioxide monatonically degrades film mechanical properties and increases water vapor permeability of polyviiwl alcohol coatings when used as an inert filler and whitener. ... 

The morphological characterization of structured latexes is a fundamental aspect of their study, because (1) it provides very useful information on the nature of the mechanisms that regulate the formation of the particle, and (2) knowledge of the organization of the polymer within the particle is the essential foundation for the theoretical interpretation of the behavior of the resulting latex films (mechanical properties, permeability, etc.). From this perspective, there are a great many techniques that require examination to eliminate artifacts and incorrect conclusions deduced from their use. 

These results point to two processes, premature radical chain termination and film shrinkage, which compete in determining the ultimate polymerization conversion efficient of multifunctional acrylates. It is obvious that critical attention must be paid to the pulse repetition rate, photoinitiator concentration, and acrylate functionality in developing any photopolymerizable system for laser-initiated polymerization. Future publications on laser-initiated polymerization of multifunctional acrylates will deal with monomer extraction of partially polymerized films, mechanical properties of laser polymerized films, and the Idnetics of single-pulsed systems. 

Xia X. 2000. Micro-Nanoprobing Measurement of Polymer Coating/Film Mechanical Properties. [WWG, LES]... 

Figure 10.35 Methods of measuring the mechanical properties of thin films (a) Nano-indentation, (b) beam deflection and (c) disc deflection. (Adapted from G.M. Pharr and W.C. Oliver, 1992, Measurement of Thin Film Mechanical Properties Using Nanoindentation , Materials Research Society Bulletin XVII (July) 28...

Influence of Volatile Compound Encapsulation on Film Mechanical Properties... 

Utmmala, N.R., Risko, C., Bruner, C., Dauskardt, R.H., Br Das, J.L., 2015. Entanglements in P3HT and their influence on thin-film mechanical properties insights from molecular dynamics simulations. 

The optical transparency of poly(vinyl carbazole) films produced by this room temperature process appears to be quite high, although transparency decreases at high conversions. In film form, this material is useful for photoconductors, charge-transfer complexes, and electroluminescent devices. The higher polymer molecular weight typically enhances film mechanical properties [247]. 

The replacement of organic solvent by water poses a number of challenges to both resin and additives, particularly in the areas of film mechanical properties and durability. The low photochemical resistance of many polymers limits their use in coatings, mainly those designed for exterior applications such as exposure for long time to sunlight. Where... 

Saha, R., Nix, W.D., 2002. Effects of the substrate on the determination of thin film mechanical properties by nanoindentation. Acta Mater. 50, 23—38. 

Film mechanical properties, such as tensile strength, elongation, and flexibility, depend more on the molecular weight (DP) than on substitution. Elongation and tensile strength increase to a maximum with increasing molecular weight flexibility increases linearly. 

Effects of Comonomer and Compositional Uniformity. Table 4 shows blown film mechanical properties for an LDPE, two gas-phase LLDPEs, and one gas-phase mLLDPE, all at the same nominal melt index and density. 

Table 4. Blown Film Mechanical Properties for LDPE, LLDPE, and mLLDPE...

Mechanical Properties. Naphthalate presence improves mechanical properties such as modulus and tensile strengths. Like PET, PEN can be oriented uniaxially (fiber) or biaxially (film and bottle) and heat-treated in a variety of ways. Consequently, mechanical properties vary over a wide range depending upon the exact fabrication parameters used. Furthermore, in films, mechanical properties may differ between the machine (MD) and transverse (TD) directions balanced films have very similar properties between the MD and the TD, whereas in... 

FIGURE 14.13 Comparison of PLA films mechanical properties. Graphs are created based on the original data published by Aigner [63]. 

The polyethylene samples obtained from Catalysts 3 and 4 were compoimded on a Brabury mixer with a suitable additive package and then the samples were fabricated into 1.0 Mil LLDPE film using a Gloucester extruder (430°F) operating with a 100 mil die-gap 2 1 blow-up ratio and a 25-inch frost line height and operating at a fabrication rate of 250 lbs PE/hr. The film mechanical properties dart... 

Pharr G.M., Oliver W.C. Measurement of thin-film mechanical-properties using nanoindentation. MRS Bull. 1992 July 28-33... 

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