Concentration dependence of crystallinity of polycarbonate by shock-cooling and subsequent freeze-drying of its various solutions

Ji, Gending; Xue, Gi; Ma, Jianlin; Dong, Chenyu; Gu, Xinhong

doi:10.1016/0032-3861(96)88470-9

Cited by 36 publications

(24 citation statements)

References 13 publications

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“…It has been suggested that polycarbonate diols could form crystalline structures. [11,12] The larger molecular weight of the macrodiol used in this study should result in an increased propensity for the soft segment to crystallize. Crystalline soft segments could probably form domains as well, but were rarely studied.…”

Section: Discussionmentioning

confidence: 99%

Cell Attachment and Proliferation on Poly(carbonate urethanes) with Various Degrees of Nanophase Separation

Hsu

Kao

2004

Macromolecular Bioscience

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In this work, we synthesized six 4,4'-diphenylmethane diisocyanate (MDI)-based poly(carbonate urethanes) (PCU) by using the macrodiol poly(1,6-hexyl, 1,2-ethyl carbonate) diol (MW = 2,017) in different molar ratios to MDI. The bulk and surface properties of cast PCU films were analyzed. The glass transition temperatures measured by dynamic mechanical analysis (DMA) and surface images obtained from atomic force microscopy (AFM) indicated that these PCU had various degrees of nanophase separation that changed with the time and film casting temperatures. The degree of nanophase separation correlated very well with endothelial cell attachment and proliferation on PCU.

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Section: Discussionmentioning

confidence: 99%

Cell Attachment and Proliferation on Poly(carbonate urethanes) with Various Degrees of Nanophase Separation

Hsu

Kao

2004

Macromolecular Bioscience

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“…The cold crystallization of freeze‐dried PC was examined by Ji et al This polymer has a considerable initial crystallinity (47%). After annealing at 190 °C for 289 h, the crystallinity of PC reached 80%, which was much higher than that of annealing ordinary crystallized samples.…”

Section: Properties Of Polymers With Limited Density Of Entanglementsmentioning

confidence: 99%

The Entanglements of Macromolecules and Their Influence on the Properties of Polymers

Pawlak

2019

Macro Chemistry & Physics

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Macromolecules form entanglements, the presence of which determines many of the polymer's properties; in solution, melt, and solid state. In this review, how the properties of polymers (rheological, thermal, and mechanical), depend on the concentration of the entanglements, is discussed. Although a typical polymer is characterized by the equilibrium density of entanglements, there are methods that can be applied for the reduction of this density. The methods used most often include dissolving a polymer and rapid freezing, crystallization during polymerization, and crystallization from a cooled dilute solution. The properties of disentangled polymers are significantly different from the properties of fully entangled polymers. These properties are discussed in relation to their dependence on the density of the entanglements. The disentangled material can be re‐entangled by the annealing of the polymer; however, reaching the equilibrium density of the entanglements is usually a slow process. It means that a polymer may be processed without losing its disentanglements. The properties of the re‐entangled polymer are usually close to the properties of the initial polymer.

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“…It is observed that the both diffractograms are very similar and that no new peaks appear in the WAXD profile after irradiation indicating that the material does not undergo any transformation [15]. Figure 3 shows the DSC curves of PCLIGHT polycarbonate, before and after gamma irradiation.…”

Section: Figurementioning

confidence: 95%

Dynamic behavior of gamma-irradiated polycarbonate

Weber

Vecchio²,

Suarez

2010

Matéria (Rio J.)

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The aim of the present work was to establish the relationship between dynamic behavior of Bisphenol A polycarbonate (BAPC) and degradation by gamma irradiation. The BAPC was exposed to 340 kGy dose and the molecular weight was evaluated by Size Exclusion Chromatography (SEC). A modified split Hopkinson pressure bar was used to measure stress-strain dynamic relations. The results showed little change in the dynamic behavior of irradiated BAPC in the highest strain rate used in this work, in spite of the high decrease in the molecular weight of irradiated BAPC. The lowest strain rate used in this work produced the highest change in the dynamic behavior of irradiated BAPC.

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Concentration dependence of crystallinity of polycarbonate by shock-cooling and subsequent freeze-drying of its various solutions

Cited by 36 publications

References 13 publications

Cell Attachment and Proliferation on Poly(carbonate urethanes) with Various Degrees of Nanophase Separation

Cell Attachment and Proliferation on Poly(carbonate urethanes) with Various Degrees of Nanophase Separation

The Entanglements of Macromolecules and Their Influence on the Properties of Polymers

Dynamic behavior of gamma-irradiated polycarbonate

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