On the reversibility of the crystalline phase transitions of poly(<i>p</i>‐xylylene)

Kirkpatrich, D. E.; Wunderlich, Bernhard

doi:10.1002/polb.1986.090240417

Cited by 26 publications

(18 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well known that annealing of PPX above 220 8C results in the irreversible conversion of the a-modification to the b-modification (one exception has been reported by Wunderlich et al [10]) [11]. In accordance with these results we obtained PPX showing almost pure b-modification by annealing 2b in nitrogen at 280 8C (Fig.…”

supporting

confidence: 94%

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

et al. 1998

View full text Add to dashboard Cite

Poly(p‐xylylene) (PPX) was prepared by vapor phase pyrolysis of [2.2]paracyclophane following the procedure of Gorham. PPX was obtained in different crystalline modifications by dry annealing, dissolution and reprecipitation under different conditions. These samples were analyzed by WAXS and 13C CP‐MAS NMR spectroscopy. Clear evidence was found that the presence of different crystalline modifications is responsible for the unexpected 13C CP‐MAS NMR spectrum as observed for as‐polymerized PPX. An attempt was made to explain the differences observed in the 13C CP‐MAS NMR spectra of different crystalline modifications by different chemical environments utilizing simulations of the crystal unit cells.

show abstract

supporting

confidence: 94%

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

et al. 1998

View full text Add to dashboard Cite

show abstract

“…However, it was shown in Refs. [36,38] that reversible behavior can also be observed under certain circumstances. More specifically, it was suggested that, the a to b 1 phase transition in PPX is kinetically slow and can occur in the temperature range between þ200 and þ250 C, with its reversibility being dependent on the annealing conditions [38].…”

Section: Resultsmentioning

confidence: 88%

“…Thus, the a to b 1 phase transition starts in thin films at temperatures slightly below the transition temperature of 220e240 C reported in Refs. [36,28] Interestingly, the planar texture of the films is retained during the a to b 1 phase transition. The a to b 1 phase transition was first observed by Niegisch, who suggested that this transition is irreversible [37].…”

Section: Resultsmentioning

confidence: 96%

Structure and optical properties of thin poly(p-xylylene) – Silver nanocomposite films prepared by low-temperature vapor deposition polymerization

Streltsov

Mailyan

Гусев

et al. 2015

Polymer

View full text Add to dashboard Cite

“…[18][19][20][21] This metastable phase is destroyed upon heating and cannot be recovered. This exothermic event is also observed in the DSC scan of melt-polymerized material.…”

Section: Resultsmentioning

confidence: 99%

Butatriene-Based Polymer Chemistry. 2. Synthesis and Characterization of Poly[1,1,4,4-bis(pentamethylene)-1,2,3-butatriene]^,1

1997

View full text Add to dashboard Cite

The cumulene 1,1,4,4-bis(pentamethylene)butatriene has been shown to undergo a thermally induced 1,4 free-radical polymerization to yield a crystalline polymer with a unique nonconjugated acetylene containing backbone. This polymerization occurs in both the melt and in solution. Typical free-radical inhibitors prevent the thermally induced polymerization. The reaction occurs in the presence or absence of free-radical initiators. The polymer is crystalline with a triclinic unit cell (a ) 9.87 Å, b ) 6.10 Å, c ) 4.97 Å, R ) 113.7°, ) 85.2°, γ ) 100.6°). No melting or glass transition is observed via differential calorimetry, but an irreversible exothermic transition is observed from both solution and melt polymerized material. This is interpreted as a cold crystallization process. Trapping of the polymerizing monomer with TEMPO leads to soluble oligomers. † This paper is dedicated to Professor Shelton Bank on the occasion of his 65th birthday.

show abstract

On the reversibility of the crystalline phase transitions of poly(p‐xylylene)

Cited by 26 publications

References 9 publications

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

Structure and optical properties of thin poly(p-xylylene) – Silver nanocomposite films prepared by low-temperature vapor deposition polymerization

Butatriene-Based Polymer Chemistry. 2. Synthesis and Characterization of Poly[1,1,4,4-bis(pentamethylene)-1,2,3-butatriene]^,1

Contact Info

Product

Resources

About

On the reversibility of the crystalline phase transitions of poly(p‐xylylene)

Cited by 26 publications

References 9 publications

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

Structural analysis of PPX prepared by vapor phase pyrolysis of [2.2]paracyclophane

Structure and optical properties of thin poly(p-xylylene) – Silver nanocomposite films prepared by low-temperature vapor deposition polymerization

Butatriene-Based Polymer Chemistry. 2. Synthesis and Characterization of Poly[1,1,4,4-bis(pentamethylene)-1,2,3-butatriene],1

Contact Info

Product

Resources

About

Butatriene-Based Polymer Chemistry. 2. Synthesis and Characterization of Poly[1,1,4,4-bis(pentamethylene)-1,2,3-butatriene]^,1