scholarly journals Compatibilization of an immiscible blend of EPDM and POM with an Ionomer

2021 ◽  
pp. 50423
Author(s):  
Mario Bragaglia ◽  
Tony McNally ◽  
Francesca R. Lamastra ◽  
Valeria Cherubini ◽  
Francesca Nanni
Keyword(s):  
Immiscible Blend

scholarly journals Chemical Interaction-Induced Evolution of Phase Compatibilization in Blends of Poly(hydroxy ether of bisphenol-A)/Poly(1,4-butylene terephthalate)

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1667
Author(s):  
Jing Liu ◽  
Hsiang-Ching Wang ◽  
Chean-Cheng Su ◽  
Cheng-Fu Yang
Keyword(s):  
Bisphenol A ◽  
Chemical Interaction ◽  
Chemical Exchange ◽  
Hydroxyl Group ◽  
Random Copolymers ◽  
Exchange Reactions ◽  
Butylene Terephthalate ◽  
Alcoholysis Reaction ◽  
Immiscible Blend ◽  
Hydroxy Ether

An immiscible blend of poly(hydroxy ether of bisphenol-A) (phenoxy) and poly(1,4-butylene terephthalate) (PBT) with phase separation was observed in as-blended samples. The compatibilization of phenoxy/PBT blends can be promoted through chemical exchange reactions of phenoxy with PBT upon annealing. The annealed phenoxy/PBT blends had a homogeneous phase with a single Tg that could be enhanced by annealing at 260 °C. Infrared (IR) spectroscopy demonstrated that phase homogenization could be promoted by annealing the phenoxy/PBT blend, where alcoholytic exchange occurred between the dangling hydroxyl group (–OH) in phenoxy and the carbonyl group (C=O) in PBT in the heated blends. The alcoholysis reaction changed the aromatic linkages to aliphatic linkages in the carbonyl groups, which initially led to the formation of a graft copolymer of phenoxy and PBT with an aliphatic/aliphatic carbonyl link. The progressive alcoholysis reaction resulted in the transformation of the initial homopolymers into block copolymers and finally into random copolymers, which promoted phase compatibilization in blends of phenoxy with PBT. As the amount of copolymers increased upon annealing, the crystallization of PBT was inhibited by alcoholytic exchange in the blends.

scholarly journals A phase-field model for the evaporation of thin film mixtures

2020 ◽  
Vol 22 (12) ◽  
pp. 6638-6652 ◽  
Author(s):  
Olivier J. J. Ronsin ◽  
DongJu Jang ◽  
Hans-Joachim Egelhaaf ◽  
Christoph J. Brabec ◽  
Jens Harting
Keyword(s):  
Thin Film ◽  
Structure Formation ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Immiscible Blend

Simulation of the structure formation of an immiscible blend upon fast drying including roughness generation.

Foaming of an Immiscible Blend System Using Organic Liquids as Blowing Agents

2010 ◽  
Vol 46 (3) ◽  
pp. 239-258 ◽  
Author(s):  
Peter Gutmann ◽  
Klaus Hildebrandt ◽  
Volker Altstädt ◽  
Axel H.E. Müller
Keyword(s):  
Organic Liquids ◽  
Blowing Agents ◽  
Immiscible Blend

Quantification of Environmental Stress Cracking in Polymer Blends through Eyring Modeling

2004 ◽  
Vol 856 ◽  
Author(s):  
Peyton L. Hopson ◽  
Robert B. Moore
Keyword(s):  
Environmental Stress ◽  
Test Sample ◽  
Stress Cracking ◽  
Rule Of Mixtures ◽  
Miscible Blend ◽  
Environmental Stress Cracking ◽  
Fluid Environment ◽  
Immiscible Blend ◽  
Craze Initiation

ABSTRACTThe effect of blending polycarbonate (PC) with an amorphous copolyester (PCTG) and a crystallizable polyester (PBT) on the environmental stress cracking (ESC) resistance was studied. The determination of the ESC resistance for the blend was accomplished through tensile testing in a fluid environment utilizing an Eyring-type activated process to describe ESC. It was found that the miscible blend, PC/PCTG, displayed a rule of mixtures for ESC resistance to all fluids tested except ether resistance. The immiscible blend, PC/PBT, displayed a significant negative deviation from the rule of mixtures for ESC resistance, except for ether resistance, which has been attributed to the development of stress sites for craze initiation at the interface between the blend components on the surface of the test sample. The differences in ether resistance compared to the trends found for the fluid ESC resistance in this study were attributed to possible changes in crystallization for the samples tested in ether. The data suggests that strongly swelling fluids, e.g. diethyl ether in the presence of PC, may cause densification from polymer crystallization resulting in voids that facilitate in the initiation and growth of crazes.

Fractionated crystallization, polymorphism and crystal transformation of poly(butylene adipate) confined in electrospun immiscible blend fibers with polystyrene

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 55961-55969 ◽  
Author(s):  
Hai-Mu Ye ◽  
Yun-Yang Song ◽  
Xiaoyu Meng ◽  
Qiong Zhou
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
High Glass Transition Temperature ◽  
Crystal Transformation ◽  
Immiscible Blend ◽  
Fractionated Crystallization

Utilizing electrospun immiscible blend fibers of poly(butylene adipate) (PBA) and polystyrene (PS) and following coating by the high glass transition temperature poly(4-tert-butylstyrene) (P4tBS), confined PBA specimens in nanometer space were effectively prepared.

The Influence of Poly(Lactic Acid) Addition to Thermal Properties of the Blended Polypropylene for Food Packaging Materials

2017 ◽  
Vol 19 (1) ◽  
pp. 36-41
Author(s):  
Achmad Hanafi Setiawan ◽  
Sanjaya Sanjaya ◽  
Fauzan Aulia
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Food Packaging ◽  
Synthetic Polymers ◽  
Poly Lactic Acid ◽  
Packaging Materials ◽  
Complete Replacement ◽  
Food Packaging Materials ◽  
Immiscible Blend ◽  
Negative Impacts

The commonly used food packaging materials are made from synthetic polymers derived from petroleum. However, the use of synthetic polymers has negative impacts on the environment, because it is difficult to degrade naturally either by the biotic or abiotic process. Although their complete replacement with eco-friendly packaging films is just impossible to achieve economically, at least for a specific application like food packaging the use of bioplastics should be the future. One of the alternatives is to blend synthetic polymer for instance polypropylene (PP) with a natural polymer like poly-lactic acid (PLA). Because their mixture is an immiscible blend because they have highly different polarity, it is necessary to add a compatibilizer such as polypropylene-grafted maleic anhydride (PP-g-MAH) in order to increase the properties of its blend miscibility. The objective of this research was to study the influence of PLA addition to the thermal properties of their blend product with PP. The combinations of PP with PLA in the ratios of (80:20); (90:10); (95:5) were prepared and then characterized for their thermal property behaviour by means of TG and DSC. The results showed that increasing the amount of PLA will decrease their enthalpy significantly

A Positron-Annihilation-Lifetime study of Polymer Blends

1993 ◽  
Vol 321 ◽  
Author(s):  
J. Liu ◽  
Y. C. Jean ◽  
H. Yang
Keyword(s):  
Bisphenol A ◽  
Polymer Blends ◽  
Positron Annihilation ◽  
Free Volume ◽  
Weight Fraction ◽  
Bisphenol A Polycarbonate ◽  
Positron Annihilation Lifetime ◽  
Miscible Blend ◽  
Immiscible Blend ◽  
Free Volume Hole

ABSTRACTPositron-annihilation-lifetime (PAL) spectroscopy has been utilized to investigate the free-volume properties of two types of polymer blends, a miscible blend of bisphenol-A polycarbonate (PC) and tetramethyl bisphenol-A polycarbonate (TMPC), and an immiscible blend of PC and polystyrene (PS). In the miscible blend, the free-volume hole size and its fraction follow a linear relationship with respect to the weight fraction while in the immiscible blend, the relationship is not linearly additive. The free-volume hole distributions in the immiscible blend are found to be significantly broader than those in the pure polymers. The difference is thought to be a result of the free volume formed and associated with the conformation and interchain packing between the dissimilar chains in incompatible polymers.

Sign in / Sign up

Export Citation Format

Share Document