The Effect of Orientation by Solid State Processes on the Amorphous Regions in Poly(vinyl alcohol) and High Density Poly(ethylene)

In the present study, high density poly(ethylene) (HDPE)/poly(vinyl alcohol) (PVA) fiber composites were prepared via melt blending technique using a co-rotating twin screw extruder (TSE). The effect of four different PVA fiber concentrations (i.e. 0, 5, 10, 20 wt%) on the melt and crystallization behavior of the HDPE/PVA fiber composites were investigated. The surface morphology of the composites was analyzed by a scanning electron microscopy (SEM). Whereas, the melt and crystallization behavior of the composites were analyzed by a differential scanning calorimetry (DSC). The SEM analysis on the cryo-fractured surface of the HDPE/PVA fiber composites exhibited that the PVA fibers were well blended/distributed in the HDPE matrix. Additionally, the DSC test results showed that the addition of PVA fiber in the HDPE matrix did not significantly change the melting peak temperature (Tm) of the composites. Furthermore, a slight decrease of the crystallization peak temperature (Tc) can be observed when the PVA fiber was incorporated in the HDPE matrix, which indicated a weak nucleation ability of the PVA fibers in the HDPE crystallization process. The same trend was also observed for the crystallinity index (Xc). The crystallinity index of the composites decreased with increasing PVA fiber loadings.

Download Full-text

Influence of the polymer molecular weights on the electrical properties of Poly(vinyl alcohol) – Poly(ethylene glycols)/Graphene oxide nanocomposites

Materials Today Proceedings ◽

10.1016/j.matpr.2020.12.565 ◽

2021 ◽

Author(s):

Shurooq S. Al-Abbas ◽

Rusul A. Ghazi ◽

Athmar K. Al-shammari ◽

Nisreen R. Aldulaimi ◽

Ali R. Abdulridha ◽

...

Keyword(s):

Graphene Oxide ◽

Electrical Properties ◽

Vinyl Alcohol ◽

Poly Vinyl Alcohol ◽

Molecular Weights ◽

Ethylene Glycols ◽

Poly Ethylene

Download Full-text

Melt Rheological Behavior of High Density Polyethylene/Poly(Vinyl Alcohol) Fiber Composites Prepared via Melt Compounding Method

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/543/1/012038 ◽

2019 ◽

Vol 543 ◽

pp. 012038

Author(s):

A. Chafidz ◽

L. Setyaningsih ◽

N. Indah ◽

W. D. P. Rengga ◽

Haryanto ◽

...

Keyword(s):

Rheological Behavior ◽

Vinyl Alcohol ◽

High Density Polyethylene ◽

Fiber Composites ◽

High Density ◽

Poly Vinyl Alcohol ◽

Melt Compounding

Download Full-text

Effect of Cobalt Stearate and Vegetable Oil on Uv and Biodegradation of Linear Low-Density Poly(Ethylene)-Poly(Vinyl Alcohol) Blends

Polymers from Renewable Resources ◽

10.1177/204124791100200401 ◽

2011 ◽

Vol 2 (4) ◽

pp. 131-148 ◽

Cited By ~ 1

Author(s):

Francis Vidya ◽

Subin S. Raghul ◽

Sarita G Bhat ◽

Eby Thomas Thachil

Keyword(s):

Vegetable Oil ◽

Vinyl Alcohol ◽

Water Soluble ◽

Poly Vinyl Alcohol ◽

Low Density ◽

Compression Moulding ◽

Melt Mixing ◽

Degradation Behaviour ◽

Moulding Process ◽

Poly Ethylene

The main objective of this study was to enhance the rate of UV and biodegradation of polyethylene by incorporating biodegradable materials and prooxidants. Prooxidants such as transition metal complexes are capable of initiating photooxidation and polymer chain cleavage, rendering the product more susceptible to biodegradation. In this work, the effect of (1) a metallic photoinitiator, cobalt stearate, and (2) different combinations of cobalt stearate and vegetable oil on the photooxidative degradation of linear low-density poly(ethylene)-poly(vinyl alcohol) (LLDPE/PVA) blend films has been investigated. For this, film-grade LLDPE was blended with different proportions of PVA. PVA is widely used in the industrial field, and recently it has attracted increasing attention as a water-soluble biodegradable polymer. Cobalt stearate and vegetable oil were added to the blends as prooxidants. The blends were prepared by melt mixing in a Thermo HAAKE Polylab system. Thin films containing these additives were prepared by a subsequent compression moulding process. The effect of UV exposure on LLDPE/PVA films in the presence as well as absence of these additives was investigated. Tensile properties, FTIR spectra, and scanning electron microscopy (SEM) were employed to investigate the degradation behaviour. It was found

Download Full-text