Film properties tensile modulus

Both the TMO-derived and AH-derived nanocelluloses could homogeneously disperse in the PVA matrixes. The TMO/PVA films were better than AH/PVA films for tensile modulus and strength but were lower for elongation. The thermal behavior of the PVA nanocomposite films was more highly improved with addition of TMO-derived nanofibrils. It has been found that because of the mild reaction condition, the environmentally friendly attribute, the good quality of resulted nanofibrils and the superior properties of the final reinforced nanocomposites, the TMO technique has significant potential in the field of composite reinforcement. 

MWNT/PS - Relationships between processing conditions and mechanical and electrical properties - Lower strains at yield stress than neat PS films - Double tensile modulus at 2.5 vol.% CNT 79... 

Comparing an uncrosslinked emulsion polymer film and a highly cross-linked automotive top coat at temperatures well below their respective glass transition temperatures as an example, both polymeric films have tensile modulus values of approximately 2 x 10 dyncm [8]. Nevertheless, these two polymer systems show very different mechanical properties in the rubbery plateau region. The tensile modulus values are approximately (5-10) x 10 and (2-8) X 10 dyncm for the emulsion polymer and automotive top coat, respectively. Thus, one can certainly improve the physical properties of this latex... 

Use of 4-methylpentene-l comonomer with ethylene provides LLDPE resin have film properties (i.e., tensile strength, modulus, transverse direction tear strength, and impact strength) superior to 1-butene-based LLDPE resin as has been claimed by B.P. Chemicals. 1-Butene has also been used as the second comonomer with 4-methylpentene-l to tailor the properties of LLDPE resin [28], The properties of 4-methylpentene-l-based LLDPE film are given in Table 4. 

The tensile properties (tensile strength, Young s modulus, and elongation) of unoriented, noncrystalline films were investigated for those polymers that formed clear films by solvent casting. The results collected in Table I allowed several general conclusions. 

Metal ion modified polyimide films have been prepared to obtain materials having mechanical, electrical, optical, adhesive, and surface chemical properties different from nonmodified polyimide films. For example, the tensile modulus of metal ion modified polyimide films was increased (both at room temperature and 200 0 whereas elongation was reduced compared with the nonmodif ied polyimide (i). Although certain polyimides are )cnown to be excellent adhesives 2) lap shear strength (between titanium adherends) at elevated temperature (275 0 was increased by incorporation of tris(acetylacetonato)aluminum(III) (2). Highly conductive, reflective polyimide films containing a palladium metal surface were prepared and characterized ( ). The thermal stability of these films was reduced about 200 C, but they were useful as novel metal-filled electrodes ( ). 

Mechanical property studies of the 10% 6F-PAI and PBI blend films further confirmed the existence of synergistic miscibility between the blend component since the tensile modulus and strength of each corresponding file was either equivalent to or exceeded the simple rule of mixtures (Fig. 11). 

These poly(ester-imides) have good electrical properties. Their tensile-modulus is about 400,000 psi (2759 MPa) at 25 C and approximately 50 percent of this modulus is retained at 200°C. Poly(ester-imide) films fail when heated at 240°C for 1000 hrs. 

Polyimide films have excellent electrical properties and a tensile modulus of over 400,000 psi at 25°C. Over 60 percent of this modulis is retained at 200°C. Polyimide wire enamels are stable for up to 100 Oiousand hours at 200°C. Polyimide fibers have a tenacity of 7 g/denier at 25°C and over 1000 hrs at 2833C is required to reduce the value to 1 g/denier. 

The mechanical properties of the polyimide films (the sample size 10-mm length, 10-mm width) were examined at room temperature using a specially made machine with a constant drawing rate of 1 mm min"1. A profile of elongation vs. load for PI(BHDA+BBH) film is shown in Figure 4. The polyimide film possessed a tensile modulus of 2.1 GPa and a tensile strength of 52 MPa, and these values can compete in terms of strength with those of a commercial polycarbonate (PC).[8] The authors believe that this is the first example of a fully alicyclic polyimide for which the mechanical property was evaluated. 

For DR values between 10 and 50, a decrease in elastic modulus with DR is observed. In the case of a polymer blend, such as PA6/LDPE, there is an almost independent behavior of the tensile properties in the MD of noncompatibilized blends as a function of the dispersed phase concentration. However, in the TD, a clear dependence of the elastic modulus is observed. It is also observed that compatibilized films have higher modulus compared to noncompatibilized films. For the films presented in Table 24.4, PA6 particulate fibers... 

Mechanical Properties Chen et al. [2007] smdied the dynamic mechanical properties of films prepared by the solution casting method of PHBHV reinforced with HAp. The results indicated that at 75°C the storage tensile modulus of the polymer matrix, E , almost doubled by incorporation of 30 wt% HAp. The decrease in tan S was attributed to the hindrance of polymeric segment mobility by the nanofiller. Polyamide-69 has been reinforced with up to 10 wt% HAp [Sender et al., 2007]. The DMA results have pointed out an enhancement of the mechanical properties as a function of HAp content up to 5 wt% above this limit they deteriorated, probably due to the HAp agglomeration. 

Physical Properties The usual values of tensile strength, tensile modulus, and ultimate elongation at various temperatures can be obtained from the typical stress-strain curves shown in Figs. 22-01 and 22-02. Such properties as tensile strength and modulus are inversely proportional to temperature, whereas elongation reaches a maximum value at about 300°C. Other factors, such as humidity, film thickness, and tensile elongation rates, were found... 

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