Crystallization-induced composition inhomogeneities in PVDF/PMMA blends

Kalivianakis, P.; Jungnickel, B.‐J.

doi:10.1002/(sici)1099-0488(19981130)36:16<2923::aid-polb7>3.0.co;2-r

Cited by 20 publications

(17 citation statements)

References 12 publications

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“…1,67,79,84 They allow the estimation of the chain diffusion coefficient in the melt. 76,77,80 It is demonstrated by Figure 2(b) that the crossover between regimes I and III moves to lower T c (1) with increasing content in NCC.…”

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 90%

“…The profile around an isolated spherulite may reach 50 lm into the melt, and the composition of NCC at the spherulite surface may be twice that of the initial composition or of the melt far from that surface. 76,77,80 The composition within the spherulites-overall as well as in its amorphous regionsmay correspondingly drop far below the initial composition. 80,85 In some cases, the composition changes at the crystallization site may cause a turn over of crystal modification and such of spherulite habit.…”

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

“…76,77,80 The composition within the spherulites-overall as well as in its amorphous regionsmay correspondingly drop far below the initial composition. 80,85 In some cases, the composition changes at the crystallization site may cause a turn over of crystal modification and such of spherulite habit. 70,75 They may also cause a change of T g of the rest melt, which in its turn influences the crystallization kinetics and resulting morphology, too.…”

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

“…18,31,66,69,76 A number of experimental techniques have been developed to map these distributions, including IR 80 and EDX 85 microscopy, respectively, or nuclei density distribution analysis. 69,76,77 Besides, theoretical con- HIGHLIGHT siderations were performed to simulate the distributions.…”

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

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Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

Liu

Jungnickel

2007

J Polym Sci B Polym Phys

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A survey is presented on the crystallization kinetics and the morphology of miscible crystalline/crystalline polymer blends. There are only few corresponding systems. In them, however, a number of strange kinetic and structural phenomena can be observed: (i) spherulitic crystallization of the components side‐by‐side, (ii) “interpenetrating crystallization,” (iii) “interlocking spherulitic crystallization,” and (iv) “interfilling crystallization.” Cocrystallization is forbidden for crystallographic reasons. The blend partners grow instead in their own lamellar stacks, and mixed lamellar stacks are a seldom and questionable exception. They crystallize also usually stepwise and not simultaneously. Upon step crystallization, the crystallization of the second component is determined by its redistribution with crystallization of the former. Those composition inhomogeneities are an independent issue that arises also with the development of the morphology in crystalline/amorphous blends, and a corresponding survey is yielded, too. The blend poly (vinylidene fluoride)/poly‐β‐hydroxybutyrate is a convenient model system as it can show all of these morphological and kinetic features after suitable thermal treatment. Some of them are demonstrated in the present publication. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 1917–1931, 2007

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Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 90%

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

Section: Htc/ncc Systems: Crystallization Induced Composition Changesmentioning

confidence: 99%

See 2 more Smart Citations

Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

Liu

Jungnickel

2007

J Polym Sci B Polym Phys

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“…This is not only because semicrystalline polymers are of importance from a commercial point of view but also because such kinds of mixtures offer the possibility of studying crystallization behavior in relation to miscibility. Studies of this kind have been mainly focused on miscible or immiscible blends, [1][2][3][4] but few dealt with the partially miscible blends. [5][6][7] It is more complicated and interesting to investigate the blends with an upper critical solution temperature (UCST) or a lower critical solution temperature (LCST).…”

Section: Introductionmentioning

confidence: 99%

Thermal Characterization of Upper Critical Solution Temperature m‐LLDPE/Poly(ethylene‐ran‐butene) Elastomer Blends

Kong

Zhao

et al. 2004

Macro Materials & Eng

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Summary: The phase and thermal characteristics of blends consisting of linear low‐density polyethylene (LLDPE) (0.7 mol‐% hexene copolymer) and poly(ethylene‐ran‐butene) (PEB) (26 mol‐% butene copolymer) have been investigated using optical microscopy (OM), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). An upper critical solution temperature of 162 °C was exhibited. The addition of PEB not only slowed the overall crystallization rate of LLDPE but also changed the distribution of lamellar thickness or perfection of LLDPE crystals. The equilibrium melting temperature of LLDPE in the blends was reduced and kept relatively constant in the bi‐phase state. The blends showed a single‐stage degradation and an intermediate thermal stability between those of the individual components. It could be attributed to their homogeneous states at degradation temperatures and the similar decomposing mechanisms of two components. The kinetic analysis of thermal degradation also confirmed the above results.Phase diagram of LLDPE/PEB blends.magnified imagePhase diagram of LLDPE/PEB blends.

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Self-decelerated crystallization in blends of polyhydroxyether of bisphenol A and poly(ethylene oxide) upon isothermal crystallization

Zheng

Jungnickel

2000

J. Polym. Sci. B Polym. Phys.

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Crystallization-induced composition inhomogeneities in PVDF/PMMA blends

Cited by 20 publications

References 12 publications

Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

Crystallization kinetical and morphological peculiarities in binary crystalline/crystalline polymer blends

Thermal Characterization of Upper Critical Solution Temperature m‐LLDPE/Poly(ethylene‐ran‐butene) Elastomer Blends

Self-decelerated crystallization in blends of polyhydroxyether of bisphenol A and poly(ethylene oxide) upon isothermal crystallization

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