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PVDF-based semicrystalline-amorphous...
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Campo, Cheryl Josephine.
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PVDF-based semicrystalline-amorphous blends: Phase behavior and thermomechanical properties.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
PVDF-based semicrystalline-amorphous blends: Phase behavior and thermomechanical properties./
作者:
Campo, Cheryl Josephine.
面頁冊數:
289 p.
附註:
Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1869.
Contained By:
Dissertation Abstracts International68-03B.
標題:
Chemistry, Polymer. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253681
PVDF-based semicrystalline-amorphous blends: Phase behavior and thermomechanical properties.
Campo, Cheryl Josephine.
PVDF-based semicrystalline-amorphous blends: Phase behavior and thermomechanical properties.
- 289 p.
Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1869.
Thesis (Ph.D.)--Case Western Reserve University, 2007.
Poly(vinylidene fluoride) [PVDF]-based semicrystalline-amorphous blends were studied to better understand the degree to which transition temperatures and mechanical properties could be varied as a function of composition. Changes in the amorphous component, processing parameters, MW, and filler content were used to manipulate blend properties.Subjects--Topical Terms:
1018428
Chemistry, Polymer.
PVDF-based semicrystalline-amorphous blends: Phase behavior and thermomechanical properties.
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Poly(vinylidene fluoride) [PVDF]-based semicrystalline-amorphous blends were studied to better understand the degree to which transition temperatures and mechanical properties could be varied as a function of composition. Changes in the amorphous component, processing parameters, MW, and filler content were used to manipulate blend properties.
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Compositional and MW series of PVDF:poly(vinyl acetate) [PVAc] blends were prepared and characterized. Varying PVDF content led to appreciable changes in crystallinity. In contrast, the effect of composition on blend glass transition temperature, Tg, was manifested only at low PVDF contents. The effect of MWPVA, on the 30:70 PVDF:PVAc composition was manifested primarily in the materials' viscoelastic response to deformation.
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Ternary blends of PVDF, PVAc, and poly(methyl methacrylate) [PMMA] showed limited miscibility with both a PVAc- and PMMA-rich amorphous phase apparent in all the compositions tested. PVDF:PMMA blends on the other hand exhibited good miscibility characterized by tunable Tg values which were further exploited by varying the processing conditions in order to obtain thermomechanical properties ideal for bio-related shape memory applications. PVDF:poly(ethyl methacrylate) [PEMA] blends, despite having very broad transitions, similarly exhibited desirable transition temperatures for in vivo actuation.
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The effect of boron nitride (BN), short carbon fibers (SCF), and clay on blend properties was also assessed. SCF filler in 50:50 PVDF:PMMA led mainly to the formation of PVDF crystals in the alpha form, clay was observed to promote growth of the beta crystal form, and BN led to a mixture of crystal forms. BN also exhibited interesting effects in the creep behavior of this system as well as the crystallization behavior of the 50:50 PVDF:PEMA blend, suppressed kinetic crystallization competing with enhanced nucleation effect under isothermal conditions observed in the latter. Depending on the processing conditions used, SCF was found to have similar nucleation effects in the 50:50 PVDF:PMMA blend but diminished degrees of crystallinity overall.
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Finally, shape memory behavior of PVDF:PVAc blends as well as SCF-filled 50:50 PVDF:PMMA was characterized using single and multiple shape memory cycles. Increasing PVDF content had a negative impact on PVDF:PVAc shape memory properties while increasing stress was found to have an enhancing effect as did low SCF filler content in 50:50 PVDF:PMMA.
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