Effect of hydrodynamic interaction on free volume changes and the mechanical properties of SGFR‐PBT composites

Abstract

In order to explore the effect of short glass fiber reinforcement (SGFR) on the mechanical properties of polybutylene terephthalate (PBT), 10–40 wt% of short glass fibers (SGF) are reinforced into PBT matrix. Microstructural characterization has been performed by positron lifetime technique. The fractional free volume obtained experimentally show negative deviation at 20, 30, and 40 wt% of SGF from the linear additivity relation. This indicates the improved adhesion between the short glass fiber and PBT matrix at 20, 30, and 40 wt% of SGF. The evaluated hydrodynamic interaction parameter (h) suggests the generation of excess friction at the interface of SGFR‐PBT composites. The positron lifetime parameters of SGFR‐PBT composites are correlated with the mechanical properties viz., tensile strength (TS), Young's modulus (YM), and elongation at break (EB). The decrease of crystallinity and average crystallite size of SGFR‐PBT composites evaluated by X‐ray diffraction results indicate the induced chemical interaction between PBT side chain and SGF due to the silane treatment of E‐glass fibers. The decreased positron lifetime parameters, reduced crystallinity, and crystallite size and improved mechanical properties are attributed to the improved chemical and physical interaction between the functional groups of SGF and PBT matrix. This is also evident from Fourier transform infrared spectrometry (FTIR) studies. POLYM. COMPOS., 39:1878–1886, 2018. © 2016 Society of Plastics Engineers

Microstructural analysis and multi‐response optimization of mechanical properties of bulk molding compound

“…[45] In addition, This reduction in the value of strain at break is attributed to the restriction imposed to the deformation capacity of the matrix by the improved adhesion between the fiber and matrix. [46] The addition of 20 wt.% of FW to the compound dropped the strain at break by 60%.…”

Poly(butylene terephthalate)/poly(ethylene glycol) blends with compatibilizers

“…Figure 6a shows that the observed diffraction peaks at 2 θ = 16.2°, 17.3°, 20.7°, 23.4°, and 25.3° correspond to (010), (010), (011), (100), and (111) for PBT, respectively, which characterizes the α‐crystal structure. On the other hand, the diffraction peaks around 2 θ = 19° for PEG are the intense peaks, which are ascribed to the (120) and (112) planes, whereas those around 2 θ = 23° are associated with the (032) and (023) planes 27,28 . Additional peaks may be observed at different 2 θ values, such as 11°, 15°, and 26°, which are attributed to other crystallographic planes of PEG.…”

“…On the other hand, the diffraction peaks around 2θ = 19 for PEG are the intense peaks, which are ascribed to the (120) and (112) planes, whereas those around 2θ = 23 are associated with the (032) and (023) planes. 27,28 Additional peaks may be observed at different 2θ values, such as 11 , 15 , and 26 , which are attributed to other crystallographic planes of PEG. The diffraction peaks can vary depending on the molecular weight and the specific processing conditions during heating and cooling.…”

The Impact of Artificial Marble Wastes on Heat Deflection Temperature, Crystallization, and Impact Properties of Polybutylene Terephthalate

“…However, its disadvantages of low heat deflection temperature and high impact sensitivity limit its development for some applications and require significant improvement [ 23 , 24 , 25 , 26 , 27 ]. In general, calcium carbonate [ 28 ], glass fibers [ 29 , 30 , 31 , 32 ], carbon fibers [ 33 ], montmorillonite [ 34 ], and carbon nanotubes [ 35 , 36 ] are commonly used as PBT reinforcements [ 37 ].…”