Thermal Behavior of Polyvinyl Alcohol/Polypropylene Grafted Maleic Anhydride Blends
0
Citation
0
Reference
20
Related Paper
Abstract:
Polyvinyl alcohol(PVA)/polypropylene grafted maleic anhydride(PP-g-MAH) blend films were prepared by melting process.The differential scanning calorimetry(DSC) was adopted to develop the crystallization and melting behavior of the blends.Results showed that with the increasing of PP-g-MAH content(less than 50 %),the crystallization and melting temperature of PVA phase increased,the crystallization rate rose,but crystallinity decreased.While with the increasing of PVA content(more than 30 %),the crystallization and melting temperature of PP-g-MAH phase decreased,crystallinity decreased,but the crystallization rate increased.The non-isothermal crystallization kinetics of PVA phase in the blend was studied according to Ozawa′s theory.Results showed that the primary crystallization of PVA phase was in a temperature range of 191~197 ℃,secondary crystallization was in a temperature range of 173~189 ℃.Keywords:
Maleic anhydride
Polypropylene
Polyvinyl Alcohol
Cite
The nano-CaCO_3/polypropylene composites modified by acrylic acid (AA) monomer with or without dicumenyl peroxide(DCP) were prepared by using a twin-screw extruder. The crystallization and melting behavior of polypropylene in the nano-CaCO_3/polypropylene composites were investigated using DSC. The results indicated that the addition of nano-CaCO_3 increased the crystallization temperature of PP due to the heterogeneous nucleation effect of nano-CaCO_3, and induced the crystallization of PP β-crystals as indicated by double peaks in the melting curves, and had little effect on the melting temperatures. For the nano-CaCO_3/polypropylene modified by AA without initiator, the crystallization temperature of polypropylene and the intensity of β-crystallization increased when the content of AA increased. In the presence of DCP, the addition of AA could further increase the crystallization temperature of PP in the composites than those without the initiator.
Polypropylene
Cite
Citations (0)
The poly(vinyl alcoh0l)/nano-zinc oxide composite was prepared by melting extrusion to investigateits crystal property.The non-isothermal crystallization kinetics of PVA film and Poly(vinyl alcoh0l)/nano-zincoxide composite were studied through Jeziorny and Liu methods based on DSC analysis.Results show that thenon-isothermal crystallization behavior of PVA film and the composite depends on cooling rate significantly.With the increase of cooling rate,the crystallization rate constant and the imperfection degree of crystallizationare increased. At the same cooling rate,the composite exhibits larger Avrami exponent and crystallization rateconstant compared with PVA film. In order to achieve the identical crystallization degree,the composite needsa lower cooling rate than PVA film.This indicates that nano-zinc oxide can increase the crystallization rate ofPVA and act as the nucleating agent of PVA.
Vinyl alcohol
Isothermal process
Avrami equation
Cite
Citations (0)
The non-isothermal crystallization behaviors of polypropylene graft poly(vinyl acetate) (PP-g-VAc) with two grafting degrees were studied by differential scanning calorimetry.The kinetics of PP and PP-g-VAc under non-isothermal crystallization conditions were analyzed by Reziorny method and R-t method.The results showed that both Reziorny method and R-t method described the crystallization behaviors successfully,VAc side chains didn't change the nucleation and growth patterns,but decreased the crystallization rate and ability: t_1/2 increased and Z_c decreased,nucleation rate of grafted PP at high graft percentage ( GP) increased,crystallization enthalpy decreased and crystallization parameter F(T) increased with GP.
Polypropylene
Isothermal process
Cite
Citations (0)
The cross-linked grafts of polypropylene with high grafting levels and polarity were prepared from isotactic polypropylene (iPP) reacting with maleic anhydride (MAH) and triallyl isocyanurate (TAIC) in solid phase. Rheological characteristic, crystallization and melting behavior, and crystal morphology of the grafts were studied. Addition of TAIC during reaction makes the molecular structure of PP stable and the molten viscosity increases significantly. The crystallization peaks, melt temperatures, crystallinity and crystallization rates of the grafted PP are lower compared to pure PP. But the nucleating ability of the cross-linked graft with higher grafting level is strongest, and the behavior of isothermal crystallization is different from that of PP and MPP. Its nucleation and growth mechanism is two-dimensional growth of crystallites from instantaneous nucleation.
Tacticity
Maleic anhydride
Polypropylene
Cite
Citations (0)
Organoclay
Exfoliation joint
Polypropylene
Maleic anhydride
Cite
Citations (3)
Non-isothermal crystallization kinetics of polypropylene/polypropylene grafted 2-acrylamido-2-methylpropanesulfonic acid(PP-g-AMPS) at different cooling rates was studied using differential scanning calorimetry.Jeziorny and Mo methods were used to analyze the DSC data.It showed that both methods described the crystallization behaviors successfully.AMPS side chains did not change the crystallization behaviors obviously,however,increased the crystallization rate.The crystallization activation energy of grafted PP was increased.
Polypropylene
Isothermal process
Cite
Citations (0)
Polycaprolactone/polyethylene glycol (PCL/PEG) blends were prepared by electrostatic spinning. The melting behavior and isothermal, non-isothermal crystallization kinetics were investigated using differential scanning calorimetry (DSC). The results showed the DSC thermograms of blend samples. With increasing PEG content, the position of the crystallization peak shifted to a higher temperature, while the position of the melting peak shifted slightlys. With increasing the heating rates, the position of the melting peak shifted to a higher temperature and the total heat of fusion also gradually increased. Both PCL and PEG could crystallize. By DSC, the PEG and PCL mutually promote to develop a thicker crystal and more perfect crystallite. This effect of promotion may result from the interaction of the molecular chain period of the two polymers. The Avrami equation described the non-isothermal crystallization kinetics of this blend very well.
Polycaprolactone
Isothermal process
Melt spinning
Cite
Citations (3)
Abstract This paper describes the nonisothermal crystallization of molten blends of two semicrystalline polymers, polypropylene (PP) and Nylon‐6 (N6). A discussion details the effect of the concentration of the compatibilizing agent, maleic anhydride grafted polypropylene (MAH‐ g ‐PP), on the crystallization behavior. The crystallization thermograms showed one crystallization peak or two crystallization peaks, which were significantly affected by the presence of MAH‐ g ‐PP. The crystallization temperature of N6 levels off down as the concentration of MAH‐ g ‐PP increases, whereas that of PP stays at a roughly constant temperature. These blends containing the compatibilizing agent exhibited concurrent crystallization at the crystallization temperature of PP. The crystallization behavior are also studied by optical microscopy under crossed polarizers. © 1994 John Wiley & Sons, Inc.
Polypropylene
Maleic anhydride
Nylon 6
Cite
Citations (97)
The non-isothermal crystallization behavior of PA6/ABS blends was investigated using differential scanning calorimetry(DSC).The DSC data was analyzed with Jeziorny and Mo methods.With increasing ABS contents,the Avrami index n increased from 4.55 to 7.04 and the crystallization peak temperature increased from 174.2 ℃ to 183.3 ℃.With increasing cooling rate,the crystallinity,crystallization temperature,and half-crystallization time decreased.
Isothermal process
Cite
Citations (0)
Polypropylene
Organoclay
Supercritical Carbon Dioxide
Spherulite (polymer physics)
Maleic anhydride
Cite
Citations (6)