On the effect of the nature of the side chain over the crystalline structure in aliphatic polyketones

Son

J of Applied Polymer Sci

2019

Compatibility studies have been conducted for polyketone (PK) and styrene–acrylonitrile (SAN) blends in which SAN polymers have different acrylonitrile (AN) contents. Measurements of mechanical properties exhibit the immiscibility of PK/SAN blends. Glass transition temperature shifts and width broadening of the glass transition mean partial compatibility in the amorphous region of the PK/SAN blends. Peak shifts of the CO functional group are larger for PK/SAN48 than that of PK/SAN40 blend. In morphological observations, the dispersed domains appear more refined for the PK/SAN48 blend and the PK/SAN48 blend has better boundary adhesion between the two phases. The Flory–Huggins interaction parameters simulated for the PK/SAN mixture were at a low level and the PK/SAN48 blend showed lower values than the PK/SAN40 blend. This means that the PK/SAN polymer blend is partially compatible in the amorphous region. The level of compatibility tends to increase as the AN content of the SAN polymer increases. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48743.

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of compatibility between aliphatic polyketone terpolymer and poly(styrene‐r‐acrylonitrile)

Son

J of Applied Polymer Sci

2019

J of Applied Polymer Sci

“…Figure 1 shows the DSC thermograms of untreated and retorted specimens of the terpolymer. In the first and third heating run in this Figure, the specimens show a broad and multiple endotherm, which is characteristic of the melting behavior of these materials 14. The third run shows that as the sample has not been properly stabilized by adequate additives, the thermogram exhibits lower melting point and a broader melting peak, a result of chemical modifications produced during the first heating scan up to well above the melting point 14.…”

Section: Resultsmentioning

confidence: 86%

Gas barrier changes and structural alterations induced by retorting in a high barrier aliphatic polyketone terpolymer

López‐Rubio

Giménez

Gavara

et al. 2006

Self Cite

Analysis of the consequences of a typical humid thermal plastic food packaging sterilization (retorting) process over the crystalline morphology and gas barrier properties of a high barrier aliphatic polyketone terpolymer was carried out by in situ simultaneous synchrotron WAXS and SAXS experiments an by DSC, ATR-FTIR spectroscopy, and oxygen transmission rate measurements. From a structural view point, it was observed that the retorting process led to a less crystalline material; however, crystallinity was fully restored by a postdrying process. The humid thermal treatment also favored the sorption of moisture in the amorphous phase to a saturation level, i.e., 2% water uptake. As a result, the oxygen permeability at 21°C was observed to increase by about nine times immediately after the humid treatment, but the barrier character was observed to quickly recover over time. From the results, it is suggested that a simple postdrying process at moderate temperatures can restore morphology and barrier properties. In the overall, it is also suggested that aliphatic polyketones withstand far better the process of retorting in comparison with, for instance, other high barrier polymers such as ethylene-vinyl alcohol copolymers reported earlier and can therefore offer even as a monolayer an alternative in retortable food-packaging applications.

Polymers for Advanced Techs

“…In order to overcome this drawback, propylene can be incorporated into the backbone in a desired ratio. The resulting terpolymer has a lower crystallinity and lower melting point, and it is tougher and more processable . At the same time, PK‐based blends with polypropylene, poly(vinylphenol), polyester, and polyamide have been successfully prepared, showing a good compatibilization level and a generally increasing thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Recycling ground tire rubber (GTR) scraps as high‐impact filler of in situ produced polyketone matrix

Sulcis

Vizza

Oberhauser

et al. 2014

A sustainable procedure for recycling powdered rubber coming from scrap tires (ground tire rubber [GTR]) is proposed as based on the dispersion in polyketone (PK) matrix, obtained in situ by CO/ethylene copolymerization. Three types of catalysts are used operative in solvents of different polarities. The catalyst productivity and the hybrids morphology are evaluated and optimized to final composites features. The obtained products are characterized by scanning electron microscopy, atomic force microscopy, and solvent extractions in order to investigate the occurrence and the extent of interactions between PK macromolecular chains and the GTR components; and their effects on the final properties were tested by differential scanning calorimetry, thermogravimetric analysis, and rheological measurements. For comparison purpose, a composite with GTR included into the matrix through blending is prepared. The results evidenced the key role exerted by the catalyst that, when operative in apolar solvent (able to swell the rubber phase), provides composites with good interfacial adhesion and breaking up of the particles with beneficial effects on final properties particularly thermal features and processability. Copyright © 2014 John Wiley & Sons, Ltd.