Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Polymer blends

Preparation and Characterization of PMMA-HDPE and HDPE-PMMA Binary Polymer Blends

S.I. Salih; A.M. Al.gabban; A.H. Abdalsalam

Engineering and Technology Journal, 2017, Volume 35, Issue 4, Pages 311-317

A comparison was made on the mechanical characteristics of binary blends polymethylmethacrylate/ high density polyethylene (PMMA-%HDPE) and vice versa. Analysis of morphology by SEM has been also accomplished. Preparation of polymer blends was performed using melt mixing method by an extruder. Tensile results showed that binary polymer blends (PMMA-%HDPE) indicated an increment in ultimate tensile strength, elastic modulus and shore D hardness compared to (HDPE-%PMMA). The blend of 95%PMMA- 5%HDPE shows superior mechanical properties. SEM results indicated that the prepared blends are not fully compatible with some separated phases of the second polymer dispersed in the matrix.

Thermogravimetric Analysis on PVA / PVP Blend Under Air Atmosphere

Nadia Azeez Betti

Engineering and Technology Journal, 2016, Volume 34, Issue 13, Pages 2433-2442

Films of poly vinyl alcohol (PVA) /poly vinyl pyrrolidone (PVP) blends have been prepared by solution casting method with different ratios of each other (100/0 , 80/20 , 60/40 , 50/50 , 40/60 , 20/80 , 0/100) to investigate their thermal stability comparing to correspondent pure polymers by using thermogravimetric analysis (TGA) under air atmosphere. It was found that PVA and PVP films show two decomposition steps while PVA/PVP blend films show three decomposition steps except the film of the ratio (20/80) that shows four decomposition steps .It was also found that blending decreases the temperature ranges at which the first and the second decomposition steps of PVA and PVP occur. It was found that blending PVA with PVP has significant effect on weight loss at first decomposition step of PVA by increasing it as the ratio of PVP increases. It was also found that blending PVA with PVP has significant effect on weight loss at second decomposition step of PVA by decreasing it as the ratio of PVP increases. It was found that the weight loss at third decomposition step of PVA/PVP blend films increases as the ratio of PVP increases . According to TGA thermograms under air atmosphere, PVA , PVP and PVA/PVP blend films show almost the same total weight loss which means of same thermal stability.

Synthesis of Biocompatible Polymer Blend for Drug Delivery in Biomedical Applications

Shemaa Abdul Sattar Saood; Ghassan M. Sulaiman

Engineering and Technology Journal, 2016, Volume 34, Issue 6, Pages 842-851

Chrysin (CH) and Caffeic acid (CA) loaded polymer films are designed as antibacterial polymer films with the advantages of a sustained release. Polymer blend film was prepared by solution casting method of (polyvinyl alcohol) (PVA) blend with Poly (vinylpyrrolidone) PVP and glycerine (GL) as plasticizer in addition to glutaraldehydeas cross linker. The surface characteristics of film were assessed by scanning electron microscopy .Furthermore, the swelling behavior was followed in DSMO and PBS. PVA/PVP films were loaded with 1, 10 and 50% for either CH or CA. Release kinetics was followed for 24 hr in PBS at 37◦C. The cumulative amount released from the polymeric PVA/PVP film loaded with 1, 10 and 50% of CH over the entire period 24 h was found to be 0.087, 0.127 and 0.146 gm, respectively .While the cumulative amount of CA released in same condition was found to be 0.875, 0.766 and 1.13 gm respectively. Antibacterial activity for both CH and CA released from the film was tested against two type of bacterial strains Staphylococcus aureuas and Escherichia coli.

Preparation and Studying the Fracture Toughness of Laminate Composites

Awham M. Hameed; Mays Sabah Mahdi

Engineering and Technology Journal, 2016, Volume 34, Issue 4, Pages 451-461

Binary polymer blend was prepared by the mechanical mixing of epoxy resin (EP) with polycarbonate (PC) in different weight ratios of (0, 5, 10, 15 and 20%). Charpy impact test was carried out on these blends to determine the values of impact strength (I.S). It was found that the blend of the ratio (20wt. %) of PC has the highest (I.S) compared with other ratios. For this reason, this percentage of mixing was selected to fabricate the composite materials. Hand lay-up method was utilized to synthesize the (single and hybrid) laminate composites with fiber volume fraction (Ф=15%). Glass and Kevlar fibers were used to reinforce the epoxy and its polymer blend with different sequences of skin and core layers of the composite. The values of Young's modulus (E), impact characteristics (I.S, Gc, Kc) and hardness were determined for these composites. It is found that the values of (E) and hardness decrease while the values of material toughness (Gc) increase with increasing the blending ratio of the polymer blend. It can also be noticed that the composite reinforced with Kevlar fibers records the highest value of (Gc) compared with other composites.