Molecular design of multicomponent polymer systems. XII. Direct observation of the location of a block copolymer in low‐density polyethylene‐polystyrene blends
01 Jan 1986-Journal of Polymer Science: Polymer Letters Edition (Wiley Subscription Services, Inc., A Wiley Company)-Vol. 24, Iss: 1, pp 25-28
TL;DR: In this paper, a modification d'un copolymere butadiene hydrogene-styrene par insertion d'une courte sequence centrale isoprene, permettant de localiser le copolyme a l'interface du melange fondu d'homopolymeres
Abstract: Modification d'un copolymere butadiene hydrogene-styrene par insertion d'une courte sequence centrale isoprene, permettant de localiser le copolymere a l'interface du melange fondu d'homopolymeres
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670 citations
TL;DR: The morphology of compatibilized polyolef in/polyamide blends was found to be significantly dependent on the concentration of an ionomer compatiblizer (polyethylene-methacrylic acid-isobutyl acrylate terpolymer) in the blend as mentioned in this paper.
Abstract: The morphology of compatibilized polyolef in/polyamide blends was found to be significantly dependent on the concentration of an ionomer compatibilizer (polyethylene-methacrylic acid-isobutyl acrylate terpolymer) in the blend. For a dispersed phase content of 10% by weight, a maximum reduction in phase size was observed when only 0.5% by weight of ionomer was added to the blend, A more significant reduction of the dispersed phase size was observed when the minor phase was nylon, due to interactions which exist between the ionomer and the polyamide. These interactions have been confirmed by Fourier transform infrared spectroscopy. At high concentrations of the ionomer, flocculation of the nylon dispersed phase was observed. In comparison to one-step mixing, blends prepared by two-step or batch mixing were characterized by a smaller dispersed phase when nylon was the matrix, and a larger particle size when nylon was the minor phase. The results observed are explained in terms of a speculative model of the interactions occurring across the nylon-polvolefin interface.
205 citations
TL;DR: In this paper, a review on compatibilization of polymer blends is presented, with a special emphasis on the use of block copolymers and reactive compatibiliization.
Abstract: Polymer blends are mixtures of at least two polymers and/or copolymers comprising more than 2 wt% of each macromolecular component. Most blends are immiscible, and need to be compatibilized. The compatibilization must not only ensure improvement in performance, but it must be reproducible, insensitive to forming stresses and repeated processing. This review on compatibilization of polymer blends is prepared in three parts : (i) description of the interface/interphase; (ii) compatibilization by addition of a copolymer (with a special emphasis on the use of block copolymers) ; and (iii) reactive compatibilization.
175 citations
TL;DR: In this article, the interfacial tension, phase morphology, and phase growth were determined for four polymer blend systems: polyethylene/polystyrene, polyylene/poly polyamide-6, polystyrene/polyamide 6, and polypoly(ethylene terephthalate).
Abstract: The interfacial tension, phase morphology, and phase growth was determined for four polymer blend systems: polyethylene/polystyrene, polyethylene/polyamide-6, polystyrene/polyamide-6, and polystyrene/poly(ethylene terephthalate). Generally, high interfacial tension correlates with coarse phase morphology and rapid phase coalescence. The addition of various potential compatibilizing agents to these binary blend systems results in lowered interfacial tension, finer and stabilized phase morphologies. The characteristics of different compatibilizing agents were compared for several of the blend systems. We also look at the influences of compatibilizing agents on mechanical properties of the blend systems. Some compatibilizing agents are able to produce substantial improvements in ultimate properties.
166 citations
TL;DR: In this paper, the authors use self-consistent mean field methods and analytical theory to determine the behavior of AB copolymers at the interface between two incompatible homopolymers, A and B.
Abstract: We use self-consistent mean field methods and analytical theory to determine the behavior of AB copolymers at the interface between two incompatible homopolymers, A and B. We calculate the reduction in interfacial tension, γ, resulting from the copolymers localizing at the A/B interface. We examine the effects of chain length, composition, and molecular architecture on the efficiency of the copolymers. In particular, we compare the interfacial behavior of different linear copolymers (random, alternating, and diblock) and various branched copolymers (stars and combs). At fixed molecular weight, the diblock copolymers are the most efficient at reducing γ. However, when we compare random and comb copolymers with diblocks at different molecular weights, we observe that the longer random or comb copolymers are more efficient than short diblocks. These studies allow us to predict the reduction in interfacial tension produced by a wide variety of copolymers and, thereby, permit a rational design of cost-effectiv...
128 citations