Polyester/vinylester polymer hybrid blended nanocomposites: Effect of nano on mechanical and thermal properties

Sankar, P. Hari; Reddy, Y. Venkata Mohana; Reddy, K. Hemachandra

doi:10.1007/s12221-015-0443-9

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…The magnitude of K1c of unsaturated polyester mixed with vinyl ester and mixed slightly will increase the value of the stress intensity factor. At the time of adding 40% vinyl ester, it appeared as the highest K1c = 1.667 N.mm1/2, with an increase of 447% compared to pure unsaturated polyester K1c = 0.772 N.mm 1/2 [3]. The vinyl ester addition by up to 40% increases the upper K1c value due to the emergence of a tough polymer by the successful interaction of the tough vinyl ester and rigid polyester polymer.…”

Section: Stress Intensity Factormentioning

confidence: 94%

“…The fracture surface characterization is shown in Figure 3(d-e) at a 70% UP/VE rate.area (1); crack surface area with a smooth cracked surface with only a small number of cracked surfaces. Region (2) is the transitional crack surface area where the rough cracked surface begins to form a region (3). The very rough crack surface has a rougher appearance due to the rapid growth of the radial cracks due to the formation of circular nano voids (red arrows) and produces different roughness lines [27,9].…”

Section: Mechanical Properties Of Polymer Blendmentioning

confidence: 99%

“…The rougher the crack surface, the higher the plastic deformation with characteristic coastal markings as shown in Figure 3d, location (3). With the addition of failure energy, the crack growth rate increases until the collapse ends [20][22].…”

Section: Mechanical Properties Of Polymer Blendmentioning

confidence: 99%

“…These resins can be reinforced for increased strength by providing reinforcement, are economical, and have good aging and water resistance [2]. This is because thermosets have a macromolecular covalent bond network structure with a tight and rigid cross-link density and are mutually bonded to each other, and it is very difficult for plastic deformation to occur at the localized crack tip, which can lead to catastrophic brittle failure [3]. Therefore, the greatest effort is the effort to absorb energy in the fracture tip area of the material so that additional plastic deformation occurs and prevents this material from moving to the brittle region [4].…”

Section: Introductionmentioning

confidence: 99%

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2023

Journal of Applied Surface Science

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Unsaturated polyester is a polymer that is widely used as a basic matrix to form strong composites for engineering applications such as cars, ships, aircraft, and other field applications. The advantages of this material are that it has a fairly high tensile strength when reinforced with appropriate reinforcement, is light and easy to shape. However, the weakness of this polymer is that it is brittle and cannot withstand shock loads. To do that, it is necessary to overcome the nature of the weaknesses mentioned above. One of the materials chosen to strengthen polyester with vinyl ester is because these polymers have almost identical molecular bonds. A crack test was carried out on the addition of vinyl ester with a different composition process. To find out whether this vinyl ester can provide an increase in the crack strength of unsaturated polyester. The aim is to find out what percentage of the mixture has good crack resistance properties, with a good percentage of the mixture. To determine the fracture resistance value of the polymer mixture, a crack resistance test was carried out which would produce a large critical stress intensity factor based on ASTM D 5405 by varying the composition of the vinyl ester mixture from 0%, 10%, 20%, 30%, 40%, and 100%. From the test results, the greatest critical stress intensity factor occurred in a mixture with a composition of 40% vinyl ester is 1.752 MPa.m1/2. The critical-stress-intensity factor an increase from 0.392 MPa.m1/2 to 1.752 MPa.m1/2 (an increase of 447 %) than pure UP.

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Section: Stress Intensity Factormentioning

confidence: 94%

Section: Mechanical Properties Of Polymer Blendmentioning

confidence: 99%

Section: Mechanical Properties Of Polymer Blendmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2023

Journal of Applied Surface Science

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“…Applications of the above material include ship building, building construction, and automotive manufacturing. [ 22 ]…”

Section: Introductionmentioning

confidence: 99%

A study on mechanical, structural, morphological, and thermal properties of raw and alkali treated Cordia dichotoma‐polyester composite

Reddy

et al. 2020

Polymer Composites

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Currently, natural fibers used as reinforcement with polymer composite materials is trending among many researchers, due to their significant properties like low density, light weight and biodegradability. One of such fibers is Cordia dichotoma, which are cheap and available in abundance. The Cordia dichotoma ffibers were extracted from its bark using water‐retting process. These unidirectional fibers were reinforced in a polyester matrix, and mechanical properties such as tensile and flexural properties of the resulting composite were determined experimentally. The Cordia dichotoma fibers were alkali treated with 5% NaOH solution to enhance bonding with matrix and the effect of this treatment on properties of the composite were explored. It was observed that 5% NaOH treatment gives considerable improvement in mechanical properties of the composite. FTIR spectroscopy was used to identify the functional groups and chemical compositions of the raw and alkali treated fiber composites. SEM analysis was carried out and resulting images revealed the existence of impurities on the surface of the raw fiber in the composite. Removal of the impurities with alkali treatment of fibers made the surface of the fibers rough and lead to improving the mechanical properties. Further, thermal stability (degradation temperature and weight loss) of raw and alkali treated fiber reinforced composites was studied using TGA.

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