Photolysis of bisphenol-based polyurethanes in solution

Liaw, Der‐Jang; Lin, Shiuh-Ping; Liaw, Been‐Yang

doi:10.1002/(sici)1099-0518(19990501)37:9<1331::aid-pola13>3.0.co;2-q

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Under the conditions of long-term isothermal heating, the mass of poly-4.4'-diphenylene oxide pyromellitimide after 15 h. heating in the inert atmosphere at the temperature of 400°C, 450°C and 500 o C decreased by 1.5, 3.0 and 7.0% respectively 38 .…”

Section: Radiation Resistance Of Organic Polymersmentioning

confidence: 94%

Modern Approaches to Polymer Materials Protecting from Ionizing Radiation

Wozniak¹,

Ivanov²,

Zhdanovich³

et al. 2017

Orient. J. Chem

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This review describes main types of organic polymers, which are now widely used and are the most resistant to ionizing radiation. It presents modern approaches to creation of radiationshielding composite materials based on polymer matrix and various types of fillers. It also discusses the efficiency of sizes of fillers' micro-and nanoparticles in terms of improving radiation resistance of organic polymer materials.

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Section: Radiation Resistance Of Organic Polymersmentioning

confidence: 94%

Modern Approaches to Polymer Materials Protecting from Ionizing Radiation

Wozniak¹,

Ivanov²,

Zhdanovich³

et al. 2017

Orient. J. Chem

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“…In the first step, the polymerization of 2-furoic acid dihydrazides 1a-1f (structures given in Scheme 2 and Table 5) with aromatic dianhydrides 2 and 3 was carried out in a polar solvent (DMA) at 20 8C giving polyhydrazideacids PHA 1-12 (see Table 5 for specific structures). The mode of monomer addition played an important role for successful polymerization, as emphasised previously [15,16]. In fact, the polyhydrazide-acids were obtained by multi-step addition of 2 or 3 to the dihydrazide solution, as described in the experimental part, since no polymer was obtained by the reverse addition or by initially mixing the entire amounts of both reactants.…”

Section: Polymersmentioning

confidence: 99%

Polyamide-imides bearing furan moieties. 1. Solution polycondensation of aromatic dianhydrydes with 2-furoic acid dihydrazides

Abid

Gharbi

Gandini

2004

Polymer

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“…Inherent viscosity, number-average and weight-average molecular weight, and solubility of various polyamides and polyimides. mers REF 1 [15] and REF 2 [23] , which were synthesized in our previous studies, are also listed in Table 2.…”

Section: Polymer Characterizationmentioning

confidence: 99%

“…The comparison of the solubility of polyamide PA-1 with its analogous polymer REF 1, derived from 2,2-bis[4-(4-aminophenoxy)phenyl] hexafluoropropane and terephthalic acid, [15] revealed that polymer PA-1 with methyl substituents on the phenylene rings showed a better solubility than the analogous polymer having no methyl substituents. A dense packing of the polymer chain is probably disturbed by the methyl groups on the phenylene rings; consequently, the solvent molecules can penetrate easily to solubilize the chain.…”

Section: Polymer Characterizationmentioning

confidence: 99%

Synthesis and Characterization of New Organosoluble Polyamides and Polyimides Based on 2,2-Bis[4- (4-aminophenoxy)-3,5-dimethylphenyl]- hexafluoropropane

Liaw¹,

Liaw

Cheng

2001

Macromol. Chem. Phys.

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A new hexafluoro‐containing diamine monomer, 2,2‐bis[4‐(4‐aminophenoxy)‐3,5‐dimethylphenyl]hexafluoropropane (TBAPHP), was synthesized in three steps, starting from hexafluoroacetone sesquihydrate and 2,6‐xylenol. The monomer was reacted with various aromatic dicarboxylic acids and tetracarboxylic dianhydrides to produce a series of polyamides and polyimides, respectively. The polyamides were prepared under Yamazaki reaction conditions. The polyimides were prepared by a two‐stage procedure that included a ring‐opening polyaddition yielding poly(amic acid)s, followed by a cyclodehydration to polyimides. The obtained polymers had inherent viscosities of 0.52–0.82 dL·g–1. All of the polymers dissolved in polar solvents, such as N‐methyl‐2‐pyrrolidinone, N,N‐dimethylacetamide, and N,N‐dimethylformamide. The polyimides derived from 4,4′‐oxydiphthalic anhydride and 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride exhibited an excellent solubility and were dissolved in cyclohexanone, pyridine, tetrahydrofuran, and chloroform. These polymers showed glass transition temperatures of 231–301°C and decomposition temperatures at 10% weight loss ranging from 470 to 495°C in nitrogen and from 473 to 505°C in air. The tough and flexible polymer films obtained from solution casting showed tensile strengths of 78–96 MPa and tensile moduli of 2.0–2.4 GPa. Polymers containing methyl substituents had higher solubilities and Tg values than those without methyl substituents. In addition, the hexafluoroisopropylidene‐containing polymers exhibited a higher solubility and thermal stability than those containing isopropylidene units. UV‐visible absorption spectra revealed that the polyimides showed a better transparency than the polyamides.

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Photolysis of bisphenol-based polyurethanes in solution

Cited by 9 publications

References 13 publications

Modern Approaches to Polymer Materials Protecting from Ionizing Radiation

Modern Approaches to Polymer Materials Protecting from Ionizing Radiation

Polyamide-imides bearing furan moieties. 1. Solution polycondensation of aromatic dianhydrydes with 2-furoic acid dihydrazides

Synthesis and Characterization of New Organosoluble Polyamides and Polyimides Based on 2,2-Bis[4- (4-aminophenoxy)-3,5-dimethylphenyl]- hexafluoropropane

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