Thermal Properties of High Density Polyethylene/Poly(Vinyl Alcohol) Fiber Composites Prepared Using Laboratory Mixing Extruder

2021 ◽  
Vol 315 ◽  
pp. 114-119
Author(s):  
Achmad Chafidz M.S. ◽  
Dewi Selvia Fardhyanti ◽  
Megawati ◽  
Prima Astuti Handayani ◽  
Muhammad Rizal
Keyword(s):  
Thermal Properties ◽  
Vinyl Alcohol ◽  
High Density Polyethylene ◽  
Crystallinity Index ◽  
Fiber Composites ◽  
High Density ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Pva Fiber ◽  
Melting And Crystallization

This paper focuses on the preparation of High Density Polyethylene/Poly (Vinyl Alcohol) Fiber composites which was fabricated via melt blending/compounding method using a Laboratory Mixing Extruder (LME). The effect of PVA fiber concentrations (i.e. 0, 5, 10, 20, 30 wt%) on the thermal properties (i.e. melting and crystallization) of the composites was investigated. The thermal properties of the composites were analysed using a Differential Scanning Calorimetry (DSC). The DSC analysis results exhibited that the presence of PVA fiber did not considerably change the melting and crystallization properties of the composites. The melting temperature (Tm) of all the composites samples were similar, which was in the range of 130 - 131 °C. The highest Tm was belong to sample PVAC-20 (i.e. 20 wt% PVA fiber). In the other hand, the crystallinity index (Xc) of the HPDE/PVA fiber composites decreased with the increase of PVA fiber concentrations. The Xc of the composites decreased from 56.7 % for PVAC-0 to 49.8 % for PVAC-20. Additionally, in term of crystallization behavior of the composites, the effect of PVA loadings on the crystallization temperature (Tc) of the composites was also not significant. The Tc of all composites samples were similar, which was about 115 °C. It can be suggested that the addition of PVA fiber did not affect the crystallization process of the matrix.

Poly(Vinyl Alcohol) Fiber Reinforced High Density Poly(Ethylene) Composites: Melting and Crystallization Behavior

2018 ◽  
Vol 773 ◽  
pp. 100-105
Author(s):  
Umi Rofiqah ◽  
Achmad Chafidz ◽  
Lilis Kistriyani ◽  
Mujtahid Kaavessina ◽  
Muhammad Rizal ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Crystallization Behavior ◽  
Crystallinity Index ◽  
Fiber Composites ◽  
High Density ◽  
Peak Temperature ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Poly Ethylene ◽  
Pva Fiber

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.

Fabrication of high-density polyethylene/multiwalled carbon nanotube composites via submerged friction stir processing

2016 ◽  
Vol 30 (2) ◽  
pp. 241-254 ◽  
Author(s):  
Jicheng Gao ◽  
Yifu Shen ◽  
Chao Li
Keyword(s):  
Thermal Properties ◽  
Friction Stir Processing ◽  
Rotational Speed ◽  
High Density Polyethylene ◽  
Traverse Speed ◽  
High Density ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Multiwalled Carbon ◽  
Friction Stir

The focus of this work was to study the effect of multiwalled carbon nanotubes (MWCNTs) on morphology, mechanical, and thermal properties of high-density polyethylene (HDPE) nanocomposites. MWCNTs/HDPE nanocomposites were prepared using submerged friction stir processing (SFSP) technique. The pristine MWCNTs without any pretreatment were blended with HDPE at a fixed traverse speed of 30 mm min−1 and various rotational speeds ranging from 1200 r min−1 to 2100 r min−1. The effect of rotational speed on MWCNTs dispersion in HDPE matrix was assessed using scanning electron microscopy. The experimental results showed the rotational speed affected the disperision of the MWCNTs. The mechanical properties of the composites were measured, and the results indicated that the tensile strength increased at first and then decreased with the increase of the rotation speed. The thermal properties of MWCNTs-filled HDPE nanocomposites were studied by differential scanning calorimetry, and the crystalline content of the prepared composites by the SFSP technology was increased. From the experimental research, it was found that the SFSP technique was a practical way to fabricate polymeric composites.

Poly(Vinyl Alcohol) Fiber Reinforced High Density Poly(Ethylene) Composites: Dynamic Mechanical Thermal Analysis

2018 ◽  
Vol 773 ◽  
pp. 46-50 ◽  
Author(s):  
Achmad Chafidz ◽  
Umi Rofiqah ◽  
Tintin Mutiara ◽  
Muhammad Rizal ◽  
Mujtahid Kaavessina ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Storage Modulus ◽  
Dynamic Mechanical Thermal Analysis ◽  
Vinyl Alcohol ◽  
High Density ◽  
Poly Vinyl Alcohol ◽  
Dynamic Mechanical ◽  
Melt Compounding ◽  
Twin Screw ◽  
Pva Fiber

In the present work, high density polyethylene (HDPE)/poly (vinyl alcohol) (PVA) fiber composites with four different PVA fiber loadings (i.e. 0, 5, 10, 20 wt%) have been prepared via melt compounding method using a twin-screw extruder. The composites were characterized for their morphology by using a scanning electron microscopy (SEM). Whereas, the dynamic mechanical thermal analysis (DMTA) was carried out by using an oscillatory rheometer. The DMTA test was carried out under torsion mode using temperature sweep test on rectangular composites samples. The DMTA results showed that the storage modulus (G¢) of the composites were higher than that of the neat HDPE and increased with increasing PVA fiber loadings. This indicated that there was a considerable stiffness enhancement of the composites. For example, at temperature of 60°C, the increases of stiffness (i.e. storage modulus) of the composites were approximately 3, 31, and 54% for PVAC-5, 10, and 20, respectively. Whereas, at higher temperature (i.e. 120°C), the increases were about 4, 50, and 98% for PVAC-5, 10, and 20, respectively. These results indicated that even at higher temperatures, the enhancement of storage modulus of the composites was still high.

Poly(Lactic Acid)/Poly(Vinyl Alcohol)/Graphene Nanocomposites

2018 ◽  
Vol 773 ◽  
pp. 10-14 ◽  
Author(s):  
Jalupak Rattanakot ◽  
Pranut Potiyaraj
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Vinyl Alcohol ◽  
Testing Machine ◽  
Poly Lactic Acid ◽  
Poly Vinyl Alcohol ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Graphene Nanocomposites

Poly(lactic acid) (PLA) is an interesting material as an environmentally-friendly replacement of petroleum-based polymers. However, some properties need improvements in order to commercially utilized PLA. In this work, graphene is used as a reinforcing filler and poly(vinyl alcohol) is used as a carrier to enhance dispersion of graphene in PLA matrix. The addition of graphene aims at improving the mechanical and thermal properties of PLA. The functional groups of graphene were characterized by Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The mechanical property testing was performed using a universal testing machine. The thermal properties were measured through differential scanning calorimetry (DSC). As a result, the Young’s modulus and the thermal properties of PLA composites increased as the amount of graphene in the composites increased due to improved dispersion of graphene in PLA matrix.

Mechanical and Rheological Properties of High Density Polyethylene Reinforced Polyvinyl Alcohol Fiber Composites

2019 ◽  
Vol 805 ◽  
pp. 88-93
Author(s):  
Achmad Chafidz ◽  
R.M. Faisal ◽  
Dewi Selvia Fardhyanti ◽  
Indar Kustiningsih ◽  
Jono Suhartono
Keyword(s):  
Polyvinyl Alcohol ◽  
Water Absorption ◽  
Rheological Properties ◽  
High Density Polyethylene ◽  
Flexural Modulus ◽  
Complex Viscosity ◽  
Fiber Composites ◽  
High Density ◽  
Polyvinyl Alcohol Fiber ◽  
Pva Fiber

In the current study, high density polyethylene filled polyvinyl alcohol fiber composites have been made via melt compounding process using a twin screw extruder. Four different fiber loadings (0, 5, 10, 20 wt%) together with HDPE matrix were mixed and melt blended with the extruder. The prepared composites were tested for their melt rheological properties, mechanical properties, FT-IR spectra, and water absorption behavior. Rheological test results exhibited that complex viscosity of the composites were higher than the neat HDPE and increased with the increase of PVA loadings. Moreover, the improvement of complex viscosity was more prominent at higher PVA loadings (i.e. PVAC-10 and PVAC-20) than at the lower one (PVAC-5). The flexural modulus and strength were higher for the all composites samples when compared to the neat HDPE, indicating that the incorporation of PVA fiber has successfully improved the mechanical (i.e. flexural) properties of the HDPE/PVA fiber composites. The FTIR analysis results prevailed the appearance of C=O spectrum at 2361 cm-1 that corresponding to carbonyl bond of PVA fiber on the whole composites. Additionally, from the water uptake test, the degree of water absorption of the composites increased with the fiber loadings.

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