Dielectric Relaxation Studies of Bis[4-(diethylamino)-2-methylphenyl]phenylmethane/ Polycarbonate Solid Solutions. A Correlation of Sub-T<sub>g</sub> Relaxations and the Glass Transition Activation Energy

Pochan, J. M.; Pochan, D. F.

doi:10.1021/ma60078a041

Cited by 12 publications

(2 citation statements)

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“…A mechanical bending test of the oriented samples showed the mechanical strength (σ), Young's modulus ( E ), and maximal strain (ε), ranging between 25 and 63 MPa, 7.6 and 16 GPa, and 1.2 and 1.3, respectively. The σ values of the poly(4HCA‐ co ‐DHCA)s with C = 25–50 mol % were comparable to those of all the conventional environmentally degradable polymers reported so far30 and of PC31; the E values of the poly(4HCA‐ co ‐DHCA)s with C = 25–50 mol % were much higher than those of all the conventional environmentally degradable polymers reported so far30 and of PC 31…”

Section: High‐performance Ecopolymers From Phytomonomerssupporting

confidence: 47%

“…7A). The melting temperatures ( T m ) were higher than 220°C and the glass transition temperatures ( T g ) ranged between 115 and 169°C, which were much higher than the values of the degradable bio‐based polymers reported so far30 and high enough for engineering use [ T g of poly(bisphenol A carbonate), PC, is 145°C31]. Further heating induced an LC‐crystal transition, which was characteristic of P4HCA 20.…”

Section: High‐performance Ecopolymers From Phytomonomersmentioning

confidence: 88%

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High‐performance functional ecopolymers based on flora and fauna

Kaneko¹

2007

The Chemical Record

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Liquid crystalline (LC) polymers of rigid monomers based on flora and fauna were prepared by in-bulk polymerization. Para-coumaric (p-coumaric) acid [4-hydroxycinnamic acid (4HCA)] and its derivatives were selected as phytomonomers and bile acids were selected as biomonomers. The 4HCA homopolymer showed a thermotropic LC phase only in a state of low molecular weight. The copolymers of 4HCA with bile acids such as lithocholic acid (LCA) and cholic acid (CA) showed excellent cell compatibilities but low molecular weights. However, P(4HCA-co-CA)s allowed LC spinning to create molecularly oriented biofibers, presumably due to the chain entanglement that occurs during in-bulk chain propagation into hyperbranching architecture. P[4HCA-co-3,4-dihydroxycinnamic acid (DHCA)]s showed high molecular weight, high mechanical strength, high Young's modulus, and high softening temperature, which may be achieved through the entanglement by in-bulk formation of hyperbranching, rigid structures. P(4HCA-co-DHCA)s showed a smooth hydrolysis, in-soil degradation, and photo-tunable hydrolysis. Thus, P(4HCA-co-DHCA)s might be applied as an environmentally degradable plastic with extremely high performance.

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Section: High‐performance Ecopolymers From Phytomonomerssupporting

confidence: 47%

Section: High‐performance Ecopolymers From Phytomonomersmentioning

confidence: 88%

High‐performance functional ecopolymers based on flora and fauna

Kaneko¹

2007

The Chemical Record

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Glass Transition Temperatures of Polymers

Andrews

Grulke

1999

The Wiley Database of Polymer Properties

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VI-244 4.6. Poly(benzimidazoles) VI-245 4.7. Poly(benzothiazinophenothiazines) VI-245 4.8. Poly(benzothiazoles) VI-245 4.9. Poly(benzoxazlnes) VI-245 4.10. Poly(benzoxazoles) VI-245 4.11. Poly(carboranes) VI-245 4.12. Poly(dibenzofurans) VI-246 4.13. Poly(dioxoisoindolines) VI-246 4.14. Poly(fluoresceins) VI-247 4.15. Poly(furan tetracarboxylic acid diimides) VI-247 4.16. Poly(oxabicyclononanes) VI-247 4.17. Poly(oxadiazoles) VI-248 4.18. Poly(oxindoles) VI-248 4.19. Poly(oxoisoindolines) VI-248 4.20. Poly(phthalazines) VI-248 4.21. Poly(phthalides) VI-248 4.22. Poly(piperazines) VI-248 4.23. Poly(piperidines) VI-249 4.24. Poly(pyrazinoquinoxalines) VI-249 4.25. Poly(pyrazoles) VI-249 4.26. Poly(pyridazines) VI-249 4.27. Poly(pyridines) VI-249 4.28. Poly(pyromellitimides) VI-249 4.29. Poly(pyrrolidines) VI-250 4.30. Poly(quinones) VI-250 4.31. Poly(quinoxalines) VI-250 4.32. Poly(triazines) VI-252 4.33. Poly(triazoles) VI-252 Table 5. Copolymers VI-252 G. References VI-253 A. INTRODUCTIONAmorphous (noncrystalline) polymeric solids are either glasses or rubbers. A glassy polymer lacks long range order, and is below the temperature at which molecular motions take place on the time scale of the experiment. A rubbery polymer is above the temperature at which molecular motions take place on the time scale of the experiment. The glass transition temperature, T g , is the critical temperature that separates glassy behavior from rubbery behavior. Many amorphous solids, including polymers, organic liquids, biomaterials, some metals and alloys, and inorganic oxide glasses, exhibit glass transition temperatures. The dramatic change in the local movement of polymer chains at T g leads to large changes in a host of physical properties. These properties include density, specific heat, mechanical modulus, mechanical energy absorption, dielectric coefficients, acoustical properties, viscosity, and the rate of gas or liquid diffusion through the polymer, to name a few. Any of these properties can be used, at least in a crude manner, to determine T g . References page VI -253 Specific volume Gl assCrystal l i zati on vol ume change Li qui d

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