Topic
Miscibility
About: Miscibility is a research topic. Over the lifetime, 5521 publications have been published within this topic receiving 133547 citations. The topic is also known as: miscible.
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TL;DR: In this article, the influence of branch content and composition distribution of hexene linear low-density polyethylene (LLDPE) on its miscibility with low density polyethylenes was investigated.
67 citations
TL;DR: In this paper, a hydrogen bonding type of interaction between the carbonyl bond of PCL and the α-hydrogen of PVC was found in compatible PCL-PVC blends.
Abstract: FT-IR spectroscopic studies have been performed in an attempt to elucidate the nature of the specific interactions occurring in miscible poly(ϵ-caprolactone) (PCL)-poly (vinyl chloride) (PVC) blends. Studies of low molecular weight analogues, polymer/solvent mixtures and blends of PCL and α-deuterated PVC are presented. The results strongly suggest that a hydrogen bonding type of interaction between the carbonyl bond of PCL and the α-hydrogen of PVC exists in compatible PCL-PVC blends.
67 citations
TL;DR: In this paper, an autocatalytic mechanism was observed for the epoxy/polyphenylene oxide (PPO) blends and the neat epoxy, and it was also found that the Epoxy/PPO blends react faster than the neat Epoxy.
Abstract: Cure behavior, miscibility, and phase separation have been studied in blends of polyphenylene oxide (PPO) with diglycidyl ether of bisphenol A (DGEBA) resin and cyanate ester hardener. An autocatalytic mechanism was observed for the epoxy/PPO blends and the neat epoxy. It was also found that the epoxy/PPO blends react faster than the neat epoxy. During cure, the epoxy resin is polymerized, and the reaction-induced phase separation is accompanied by phase inversion upon the concentration of PPO greater than 50 phr. The dynamic mechanical measurements indicate that the two-phase character and partial mixing existed in all the mixtures. However, the two-phase particulate morphology was not uniform especially at a low PPO content. In order to improve the uniformity and miscibility, triallylisocyanurate (TAIC) was evaluated as an in situ compatibilizer for epoxy/PPO blends. TAIC is miscible in epoxy, and the PPO chains are bound to TAIC network. SEM observations show that adding TAIC improves the miscibility and solvent resistance of the epoxy/PPO blends.
67 citations
TL;DR: In this article, the authors examined poly(ethylene terephthalate) (PET) and a series of statistical and blocky copolymers in which up to 30% of the TG was replaced with isophthalate by copolymerization and melt blending, respectively.
Abstract: The present study examined poly(ethylene terephthalate) (PET) and a series of statistical and blocky copolymers in which up to 30% of the terephthalate was replaced with isophthalate by copolymerization and melt blending, respectively. Some level of transesterification dur- ing processing of melt blends resulted in blocky copolymers, as confirmed by NMR. Random and blocky copolymers exhibited similar properties in the glassy state, including a single glass transition, due to miscibility of the blocks. How- ever, random copolymerization effectively retarded cold- crystallization from the glass whereas blocky copolymers readily cold-crystallized to a crystallinity level close to that of PET. The polymers were oriented at four temperatures in the vicinity of the Tg and characterized by oxygen transport, wide-angle X-ray diffraction, positron annihilation lifetime spectroscopy, and infrared spectroscopy. Orientation of all the copolymers resulted in property changes consistent with strain-induced crystallization. However, blocky copolymers oriented more easily than random copolymers of the same composition and after orientation exhibited slightly lower oxygen permeability, higher density, and higher fraction trans conformers. Analysis of oxygen solubility based on free volume concepts led to a two-phase model from which the amount of crystallinity and the amorphous phase density were extracted. Dedensification of the amorphous phase correlated with the draw temperature.© 2005 Wiley Periodi-
67 citations
TL;DR: In this paper, pairwise interaction energies between the different chemical species were calculated from equilibrium melting point depression data and a binary interaction model, and it was shown that neutralization of the acid reduced the concentration of acid cyclic dimers that favored phase separation.
Abstract: Blends of poly(acrylic acid), PAA, and poly(ethylene glycol), PEG, are miscible over the entire range of composition as a result of hydrogen-bonding between the acids and ether oxygens. Infrared analysis showed that the formation of acid-ether complexes is preferred over that of cyclic acid dimers formed from self-association of the carboxylic acid groups. Miscibility decreased as the extent of neutralization of acrylic acid (AA) to the lithium salt (LiA) increased, and lower critical solution temperatures (LCST) were observed for blends made with AA-LiA copolymers containing 0.1-0.4 mole fraction LiA. Pairwise interaction energies between the different chemical species were calculated from equilibrium melting point depression data and a binary interaction model. Favorable interactions between AA and ethylene glycol (EG) promoted miscibility, while an unfavorable interaction between LiA and EG favored demixing. Infrared analysis showed that neutralization ofthe acid reduced the concentration of acid-ether complexes and promoted formation of acid cyclic dimers that favored phase separation
67 citations