Synthesis and characterization of photo-crosslinkable poly(benzylidene phosphoramide ester)s

Murugavel, S. C.; Swaminathan, C.; Kannan, P.

doi:10.1016/s0032-3861(97)00040-2

Cited by 20 publications

(12 citation statements)

References 27 publications

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“…At the research and development stage, a polymer providing a good char yield from TGA under either an air or nitrogen atmosphere is a useful indication of the polymer being a fire retardant. Thick char becomes a better thermal insulating layer and undergoes slow oxidative degradation, protecting the remaining polymer from heat radiation 17. The high char content at 600 °C might have been due to the formation of phosphoric acid at the end of thermolysis 18, 19…”

Section: Resultsmentioning

confidence: 99%

Studies on blends of high‐density polyethylene and polypropylene produced by oscillating shear stress field

Zhang

Shen

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:Tensile strength and morphology of blends of high-density polyethylene (HDPE) and polypropylene (PP) obtained by oscillating packing injection molding were investigated via Universal Testing Machine, DSC, and SAXS. Tensile strength is greatly enhanced from 24.5 MPa to more than 90 MPa for pure HDPE and for blends with PP content less than 10 wt %. There exists a sharp decrease of tensile strength when PP content is more than 10 wt %. The shearinduced morphologies with core in the center, oriented zone surrounding the core and skin layer are observed in the cross-section areas of the samples. Interestingly, a sharp decrease of oriented zone is seen when PP content is more than 10 wt %, associated with the sharp decrease of tensile strength. DSC result shows double melting peaks with a high-temperature melting peak that is not present in the endotherm obtained from the central core and obtained from the samples by static packing injection molding, which indicates the existence of shish-kebab structure in the oriented zone. However, there is no difference of crystallinity between the samples by oscillating and by static packing injection molding. SAXS was used to analyze the complicated morphologies induced by shear stress, and results show that the crystal thickness could be greatly increased under shear stress.

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Section: Resultsmentioning

confidence: 99%

Studies on blends of high‐density polyethylene and polypropylene produced by oscillating shear stress field

Zhang

Shen

et al. 2002

J of Applied Polymer Sci

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“…Kricheldorf reported the thermotropic liquid crystalline poly(arylphosphate ester)s for the use of high performance fibers and observed that the T g of the polymers decreases with increase in the phosphorus content [21]. In our earlier studies, we have demonstrated that the introduction of phosphate group into the polymer backbone improved their solubility due to its polarity and high char yield [22][23][24][25][26]. The literature survey reveals that the investigations on the synthesis of liquid crystalline and photocrosslinkable polymers (LCPCPs) were scarce [18].…”

Section: Introductionmentioning

confidence: 96%

Investigation on thermotropic liquid crystalline and photocrosslinkable polyarylidene arylphosphate esters containing cyclohexanone units

Sakthivel

Kannan

2005

Polymer

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“…m-Bromoalkanols (m56, 8,10) were prepared according to the reported procedure [16,17]. 2,5-Bis(benzylidene)cyclopentanone (BVCP) was synthesized by the reaction of vanillin with cyclopentanone in the presence of acid catalysts in absolute ethanol [18]. 8,10).…”

Section: Methodsmentioning

confidence: 99%

Thermotropic liquid crystalline‐cum‐photocrosslinkable poly(benzylidene arylphosphate ester)s containing the cyclopentanone moiety

Sakthivel

Kannan

2006

Liquid Crystals

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A new class of linear unsaturated polyarylphosphate esters based on dibenzylidene cyclopentanone, possessing liquid crystalline-cum-photocrosslinkable properties has been synthesized from 2,5-bis(m-hydroxyalkyloxybenzylidene)cyclopentanone (m56,8,10) with various aryl phosphorodichloridates (aryl5phenyl, naphthyl, biphenyl) in chloroform at ambient temperature. Their chemical structures were confirmed by FTIR, and 1 H, 13 C and 31 P NMR spectroscopy. Intrinsic viscosity showed that all the polymers were materials of moderate molecular mass. Phase behaviour was investigated with differential scanning calorimetry and hot stage polarizing optical microscopy, under which all the polymers showed anisotropic behaviour. The T m and T i of the polymers decreased with the increasing flexible methylene chain in the polymer backbone. The thermal behaviour of the polymers was studied by thermogravimetric analysis, and their photocrosslinking properties investigated by UV spectroscopy. The crosslinking proceeds via 2p-2p cycloaddition reactions of the dibenzylidene exocyclic double bond of the polymer backbone. The pendant biphenyloxy-containing polymers show faster crosslinking than the pendant naphthyloxyand phenyloxy-containing polymers. The rate of crosslinking increases as the methylene chain lengthens in the polymer backbone.

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Synthesis and characterization of photo-crosslinkable poly(benzylidene phosphoramide ester)s

Cited by 20 publications

References 27 publications

Studies on blends of high‐density polyethylene and polypropylene produced by oscillating shear stress field

Studies on blends of high‐density polyethylene and polypropylene produced by oscillating shear stress field

Investigation on thermotropic liquid crystalline and photocrosslinkable polyarylidene arylphosphate esters containing cyclohexanone units

Thermotropic liquid crystalline‐cum‐photocrosslinkable poly(benzylidene arylphosphate ester)s containing the cyclopentanone moiety

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