Miscibility of ethylene–styrene copolymer blends

Chen, H.Y; Cheung, Y. W.; Hiltner, A.; Baer, E.

doi:10.1016/s0032-3861(01)00212-9

Cited by 18 publications

(18 citation statements)

References 24 publications

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“…In this study, we compare blends of two statistical EO copolymers with blends of an OBC and an EO in terms of the phase behavior in the melt. Using a methodology previously developed to image the phase condition of chemically similar polyolefin constituents,25 the effects of blend composition, melt temperature, constituent comonomer content, and constituent molecular weight and molecular weight distribution on the melt phase behavior are probed.…”

Section: Introductionmentioning

confidence: 99%

Effect of chain blockiness on the phase behavior of ethylene‐octene copolymer blends

Kamdar

Wang

Khariwala

et al. 2009

J Polym Sci B Polym Phys

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New challenges and opportunities for polyolefin blends arise from the recent introduction of olefin block copolymers (OBCs). In this study, the effect of chain blockiness on the miscibility and phase behavior of ethylene-octene (EO) copolymer blends was studied. Binary blends of two statistical copolymers (EO/EO blends) that differed in comonomer content were compared with blends of an EO with a blocky EO copolymer (EO/OBC blends). The blends were rapidly quenched to retain the phase morphology in the melt and the phase volumes were obtained by atomic force microscopy (AFM). Two EOs of molecular weight about 100 kg/mol were miscible if the difference in octene content was less than about 10 mol % and immiscible if the octene content difference was greater than about 13 mol %. The blocky nature of the OBCs reduced the miscibility and broadened the partial miscibility window of the EO/OBC blends compared with the EO/EO blends. The EO/OBC blends were miscible if the octene content difference was less than 7 mol % and immiscible above 13 mol % octene content difference. It was also found that the phase behavior of EO/OBC blends strongly depended on blend composition even for constituent polymers of about the same molecular weight. Significantly more demixing was observed in an OBC-rich blend (EO/OBC 30/70 v/v) than in an OBC-poor blend (EO/OBC 70/30 v/v). An interpretation based on extractable fractions of the OBC described the major features of the EO/OBC (30/70 v/v) blends. V V C 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys

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Section: Introductionmentioning

confidence: 99%

Effect of chain blockiness on the phase behavior of ethylene‐octene copolymer blends

Kamdar

Wang

Khariwala

et al. 2009

J Polym Sci B Polym Phys

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“…AFM in tapping mode can also be used to observe the microstructure and compatibility of materials using the principle that phase lag is directly related to the elastic modulus of the materials. 20 The modulus difference between PU and VER is large enough to provide good contrast in AFM phase images. AFM images of the 70:30 and 50:50 PU/VER(EA)IPNs were shown in Figure 4.…”

Section: Atr-ft/ir Analysismentioning

confidence: 99%

Compatibility of Polyurethane/(vinyl ester resin)(ethyl acrylate) Interpenetrating Polymer Network

Qin

Jin

Bai

et al. 2007

Polym J

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A novel polyurethane/poly(vinyl ester resin) interpenetrating polymer Network(PU/VER IPN), was synthesized at room temperature by polymerizing ethyl acrylate(EA) instead of the conventionally styrene(St) as a comonomer. The respective compatibilities of PU/VER(EA)IPN and PU/VER(St)IPN were studied by ATR-FT/IR, TEM, AFM, DSC and DMA. The results showed that, compared with PU/VER(St)IPN, the degree of carbonyl hydrogen bonding in PU/VER(EA)IPN increased because EA substituted for St, resulting in better compatibility of PU/ VER(EA)IPN. PU/VER(EA)IPN showed a nanometer scale phase range and a dual continuous microstructure, while the phase range of PU/VER(St)IPN was 200-500 nm. Furthermore, DSC showed that PU/VER(EA)IPN had one obvious T g , while PU/VER(St)IPN had two T g s. The compatibility of PU/VER(EA)IPN was further detected quantitatively. In addition, the 60:40 PU/VER(EA)IPN had a predominant damping peak and a shoulder damping peak which were closer than the two corresponding peaks of PU/VER(St)IPN. PU/VER(EA)IPN had higher tan, E 00 , E 0 , TA and LA for a broad range of temperature, all indicating better compatibility and damping properties. Their mechanical properties were also studied preliminarily.

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“…The invention and development of scanning probe microscopy and AFM [20][21][22] provides new capabilities for imaging polymer morphology and mapping multiphase systems based on polymers with nanometer or better spatial resolution. In AFM, a sharp probe (tens of nanometer wide) mounted on a free cantilever end interacts with the sample surface.…”

Section: Tm-afm Morphological Analysismentioning

confidence: 99%

Morphological analysis of highly filled propylene/ethylene copolymers

Ionescu-Vasii

Wood‐Adams

Duchesne

et al. 2007

J of Applied Polymer Sci

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A series of particulate composites based on a new family of propylene/ethylene (P/E) copolymers produced by Dow Chemical Co. were studied with microscopy and differential scanning calorimetry (DSC). To understand the good processability exhibited by the composites, we studied the composite microstructure and the bulk rheological properties. Here we report the results of a study of the microstructure and thermal behavior. Electron micrographs of the composites showed a uniform dispersion of the particles in the copolymer matrices at all experimental concentrations with very little particle agglomeration. The images suggested low adhesion between the matrices and the particles. The copolymers were semicrystalline, and their morphologies changed with the ethylene content. An increase in the ethylene content led to a decrease in the crystallinity and changes in the shape and size of the crystallites. Tapping-mode atomic force microcopy images of a 9 wt % ethylene copolymer contained spherulites, lamellae, and a crosshatched structure characteristic of a-isotactic polypropylene. The crosshatched structure was not present at higher ethylene contents. A DSC study of the pure copolymers and their composites revealed that only very small modifications to the thermal behavior of the P/E copolymers were induced by calcium carbonate particles.

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Miscibility of ethylene–styrene copolymer blends

Cited by 18 publications

References 24 publications

Effect of chain blockiness on the phase behavior of ethylene‐octene copolymer blends

Effect of chain blockiness on the phase behavior of ethylene‐octene copolymer blends

Compatibility of Polyurethane/(vinyl ester resin)(ethyl acrylate) Interpenetrating Polymer Network

Morphological analysis of highly filled propylene/ethylene copolymers

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