Effect of pendant group of polysiloxanes on the thermal and mechanical properties of polybenzoxazine hybrids

Ardhyananta, Hosta; Kawauchi, Takehiro; Ismail, Hanafi; Takeichi, Tsutomu

doi:10.1016/j.polymer.2009.10.001

Cited by 59 publications

(43 citation statements)

References 32 publications

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“…The data is also summarized in Table 1. The results reveal a small dependence of Young's 45,46 Replacing the methylethylidene linker of bisphenol-A with more flexible aliphatic chains clearly illustrates the effect of molecular architecture and molecular weight between cross-links on tensile properties.…”

Section: Thermomechanical and Tensile Propertiesmentioning

confidence: 88%

Flexible aliphatic-bridged bisphenol-based polybenzoxazines

et al. 2012

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In this paper, we report the synthesis of a series of novel aliphatic-bridged bisphenol-based benzoxazine monomers comprising four to ten methylene unit spacers (BZ(n)BA). Cationic ring-opening polymerization of these monomers provides flexible polybenzoxazine thermosets with good film forming characteristics under solvent-free processing conditions. The effects of aliphatic bisphenol chain length on polymerization behavior, thermomechanical transitions, and mechanical properties of the polybenzoxazine thermosets are reported. Fourier transform-infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) show the ring-opening polymerization proceeds to high conversion with minimal dependence on spacer chain length. Thermomechanical properties of the pBZ(n)BA thermosets, such as rubbery storage modulus and glass transition temperature (T g ), show a strong dependence on the length of the aliphatic-bridged bisphenol linker where both properties decrease with increasing linker length. In particular, changing the length of the aliphatic-bridged bisphenol linker enables tailoring the T g of the pBZ(n)BA series from 67 C to 101 C, as determined by dynamic mechanical analysis (DMA). Tensile properties of the pBZ(n)BA series exhibit similar trends with Young's modulus decreasing and elongation at break increasing with increasing aliphatic-bridged bisphenol linker length. The pBZ(n)BA materials all show a similar three mode degradation process by thermogravimetric analysis (TGA) consistent with other bisphenol based polybenzoxazines, and additionally exhibit a decrease in char yield with increasing aliphatic chain length owing to a decrease in aromatic content in the thermoset network.

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Section: Thermomechanical and Tensile Propertiesmentioning

confidence: 88%

Flexible aliphatic-bridged bisphenol-based polybenzoxazines

et al. 2012

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“…Figure 2B shows the change of the ratio of the absorbance at 1016 cm -1 with curing temperature. The Si-O-Si absorbance increased with the progress of cure, suggesting that the condensation of diethoxysilanes occurred during the cure, possibly increasing the molecular weight of polysiloxanes [13,14]. All the polysiloxanes showed similar trend.…”

Section: Preparation Of Pi-polysiloxane Hybridsmentioning

confidence: 91%

Preparation and Properties of Polyimide-Polysiloxane Hybrids Using Sol-Gel Method

Shirai

Takahashi

Kawauchi

et al. 2013

J. Photopol. Sci. Technol.

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Polyimide (PI) was successfully hybridized with polysiloxanes by synchronizing two reactions; imidization of poly(amide acid) (PAA) and sol-gel process of diethoxysilanes. Diethoxydimethylsilane, diethoxymethylphenylsilane, and diethoxydiphenylsilane were used as precursors for the formation of polydimethylsiloxane (PDMS), polymethylphenylsiloxane (PMPS), and polydiphenylsiloxane (PDPS), respectively. The progress of sol-gel reaction was confirmed by IR. The compatibility of polysiloxanes with polyimide was studied by scanning electron microscopy, which revealed better compatibility of phenyl group containing polysiloxanes. The effect of the pendant group of polysiloxane on the mechanical and thermal properties of PI-polysiloxane hybrids was studied. Tensile strength of PI were increased by the addition of small amount of polysiloxanes. Hybrid containing 3 wt% of PDMS gave the highest tensile properties. Dynamic viscoelastic analysis of the PI-polysiloxane hybrid revealed two glass transition temperatures corresponding to polysiloxane and PI components. Thermogravimetric analysis revealed higher thermal stability by the hybridization.

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“…[36][37][38][39][40][41][42] Previously, we succeeded in synthesizing high-molecular-weight benzoxazines (HMWBs) having benzoxazine units in the main chain by the reaction of bisphenol A, diamines, and paraformaldehyde. 22,26 HMWBs were easily soluble in various common solvents and the thermally cured films were much more flexible and tough, had higher T g s, and higher thermal stability than PB-a.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polymer alloys consisting of high-molecular-weight benzoxazine and bismaleimide

Takeichi

Uchida

Inoue

et al. 2013

High Performance Polymers

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Novel polymer alloys were prepared by blending a high-molecular-weight benzoxazine (HMWB) and a typical bismaleimide (4,4 0 -bismaleimidodiphenyl methane (BMI)) followed by thermal treatment up to 240 C. It was confirmed by the infrared and differential scanning calorimetric analyses that the phenolic hydroxyl group formed by the ring-opening polymerization of HMWB reacted with the double bond of BMI, in addition to the chain polymerization of the double bond of BMI and the ring-opening polymerization of HMWB. This further cross-linking through the formation of ether linkage made the polymer alloy films much more tough and flexible than each homopolymer film. Moreover, viscoelastic analyses and thermogravimetric analyses of the polymer alloy films showed that glass transition temperature and thermal stability also increased by alloying.

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Effect of pendant group of polysiloxanes on the thermal and mechanical properties of polybenzoxazine hybrids

Cited by 59 publications

References 32 publications

Flexible aliphatic-bridged bisphenol-based polybenzoxazines

Flexible aliphatic-bridged bisphenol-based polybenzoxazines

Preparation and Properties of Polyimide-Polysiloxane Hybrids Using Sol-Gel Method

Preparation and properties of polymer alloys consisting of high-molecular-weight benzoxazine and bismaleimide

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