PMC-12: A Rapid Cure Epoxy Resin System for RTM Process(PMC-II: POLYMERS AND POLYMER MATRIX COMPOSITES)

AbstractIn this study, polymer-matrix composites are fabricated by mixing liquid epoxy resin with 0, 15, 20 and 25 wt % of PET. PET is used as a reinforcement material since it can be recycled and this implies a beneficial environmental impact. After mixing, specimens are dried at room temperature during 24 h and then cured at 150°C during 0.5, 0.75 and 1 h. Then mechanical tests are performed. Experimental results obtained from the flexion test for 100 % epoxy resin and 15 % PET samples, without curing treatment show values of 30 and 21 MPa, respectively. Flexure strength values for the same samples but after curing treatment are: 56, 90, 32 MPa and 69, 64, 70 MPa, for 0.5, 0.75 and 1 h of treatment, respectively. These data show an important increase in the flexure strength for the sample reinforced with 15 % PET and curing time of 1h. This is most likely due to the behavior of PET's powders at this temperature and time. They can partially melt improving the adhesion to the polymeric matrix. For a curing time of 0.75h, this property decreases, due to the high porosity developed in the composite and the poor adhesion between polymeric matrix and reinforced material.

Download Full-text

UV Sensor Based on Fiber Bragg Grating Covered with Graphene Oxide Embedded in Composite Materials

Sensors ◽

10.3390/s20195468 ◽

2020 ◽

Vol 20 (19) ◽

pp. 5468

Author(s):

Piotr Lesiak ◽

Karolina Bednarska ◽

Krzysztof Małkowski ◽

Łukasz Kozłowski ◽

Anna Wróblewska ◽

...

Keyword(s):

Graphene Oxide ◽

Epoxy Resin ◽

Fiber Bragg Grating ◽

Uv Radiation ◽

Polymer Matrix ◽

Polymer Matrix Composites ◽

Glass Fibers ◽

Fiber Optic Sensor ◽

Bragg Grating ◽

Matrix Composites

Polymer–matrix composites degrade under the influence of UV radiation in the range of the 290–400 nm band. The degradation of polymer–matrix composites exposed to UV radiation is characterized by extensive aging of the epoxy matrix, resulting in deterioration of their mechanical properties. Glass fibers/epoxy resin composites were made by an out-of-autoclave method whereas a fiber optic sensor was placed between different layers of laminates. In our work, we used a fiber Bragg grating sensor covered with graphene oxide and embedded in a polymer matrix composite to monitor UV radiation intensity. Measurements of UV radiation may allow monitoring the aging process of individual components of the polymer composite. In order to estimate the number of microcracks of epoxy resin, microstructure observations were carried out using a scanning electron microscope.

Download Full-text

Dielectric Properties of AlN/Polymer Composites for Electronic Substrate Application

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.334-335.1053 ◽

2007 ◽

Vol 334-335 ◽

pp. 1053-1056 ◽

Cited By ~ 3

Author(s):

Jie Zhang ◽

Hui Qing Fan ◽

Sha Ming Ke ◽

Yun Ze Shi ◽

Xian Hua Zeng ◽

...

Keyword(s):

Dielectric Properties ◽

Epoxy Resin ◽

Polymer Matrix ◽

Polymer Matrix Composites ◽

Cole Plot ◽

Matrix Composites ◽

Low Dielectric ◽

The Matrix ◽

Varied Form ◽

Electronic Substrates

The fabrication processing, dielectric properties and thermal properties of polymer-matrix composites containing AlN particles (10μm) for electronic substrates and microelectronic packaging applications were investigated. The epoxy resin (E-51) is used as the matrix, and the dispersion of the AlN in the composites is varied form 0 vol% to 40 vol%. The microstructures of the polymer-matrix composites are observed through scanning electron microscopy (SEM). With increasing the AlN content, thermal conducting of composites is improved, while the composites still keep the relatively low dielectric constant and dielectric loss. According to the dielectric properties dependence on frequencies (1kHz-10MHz) of the composites, the Cole-Cole plot is analyzed. The dipole relaxation in the composite is induced, and it is suggested that the air layer exit between the epoxy resin and the AlN particles.

Download Full-text