Poly(hydroxyether of bisphenol A)-block-polydimethylsiloxane alternating block copolymer and its nanostructured blends with epoxy resin

Gong, Wei; Zeng, Ke; Wang, Lei; Zheng, Sixun

doi:10.1016/j.polymer.2008.05.032

Cited by 92 publications

(50 citation statements)

References 69 publications

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“…1,2 However, pure poly(dimethylsiloxane) (PDMS) had very little use as a toughening agent because of the poor compatibility between soft segments of PDMS and polar hard segments in epoxy which largely resulted from the lack of hydrogen bonding. 3 To improve the compatibility of polysiloxane with epoxy matrix, a large number of researches have been conducted, including using silane coupling agents, 4,5 utilizing functional polysiloxanes (such as capped with hydroxide, 6 amino, 7-9 epoxide, 10-12 carboxyl 13 and isocyanate group 14 ), adding block containing silicone to make polysiloxane homogeneously dispersed in the matrix, [15][16][17][18] and making use of sol-gel method to bridge polysiloxane and epoxy monomers. 19 Unfortunately, the addition of these modified polysiloxanes invariably results in a decrease of glass transition temperature or a increase in the viscosity of the final resin blends with even comparatively small amounts of additive.…”

Section: Introductionmentioning

confidence: 99%

Toughening of epoxy resin system using a novel dendritic polysiloxane

Liu

et al. 2010

Macromol. Res.

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Dendritic polymers have attracted increasing attention in the field of epoxy resin toughening. This paper is the first report of the use of a novel dendritic polysiloxane (DPSO) bearing high epoxide groups to modify the diglycidyl ether of bisphenol-A (DGEBA). The thermal properties, toughness and morphology of the cured epoxy resins were examined by DSC, TGA, impact testing and SEM. The chemical structure of DPSO was confirmed by FTIR, 29 Si NMR and GPC. The T g increased by approximately 7 o C after introducing the DPSO. The TGA results under N 2 and air atmospheres showed that the initial degradation temperature for 5% weight loss (T d 5%), temperature for 50% weight loss (T d 50%) and residual weight percent at 800 o C (R 800 ) all increased after introducing DPSO. Moreover, the addition of 3 phr DPSO100 resulted in a 70.4% increase in impact strength compared to that of the neat epoxy. The morphology of the fracture surfaces shows that the miscibility of polysiloxane with epoxy resin increased with increasing number of epoxy groups in DPSO, and the improved toughness was attributed to the rubber-bridged effect. The high number of epoxy groups in dendritic polysiloxane can react during the curing process, and participate chemically in the crosslinking network. DPSO is expected to improve significantly the toughness and thermal stability of epoxy resin.

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Section: Introductionmentioning

confidence: 99%

Toughening of epoxy resin system using a novel dendritic polysiloxane

Liu

et al. 2010

Macromol. Res.

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“…The reaction process has been discussed by a number of authors (Hu et al, 2013;Naoaki and Kumanotani, 1973;Unnikrishnan and Thachil, 2006;Gong et al, 2008;Zhang et al, 2004) and may be summarised as follows.…”

Section: Synthesis and Processing Of Epoxy Resinsmentioning

confidence: 99%

Development of technology to industrialise the production of 80000 MTPY epoxy resins

2015

Pigment &Amp; Resin Technology

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Purpose -The purpose of this paper is to establish a technology that is suitable for the production of the 80,000 MTPY series of epoxy resins on an industrial scale. Design/methodology/approach -This paper introduces the synthesis and processing of epoxy resins, including liquid epoxy resins (DGEBA) (E-51 and E-44), brominated bisphenol A-based epoxy resins (EX-23-80A), semisolid epoxy resins based on DGEBA (E-39D) and solid epoxy resins based on DGEBA (E-21). The study analyses the theoretical raw materials of epoxy resins per tonne, and lists an example of a distributed control system (DCS) to explain that the production process of 80,000 MTPY epoxy resins can be automated. Findings -A two-step method was used to produce either E-51 or E-44 sequentially in the pre-reactor, the reactor, the recycling kettle, refining kettle (1), the refining kettle (2) and the desensitizing kettle or the falling-film evaporator. An advancement process was adopted to manufacture EX-23-80A, E-39D and E-21 using E-51 as a raw material in the predominating kettle and the mixing kettle, the adding kettle (1) and the adding kettle (2), separately. All the processes were controlled automatically by DCS to yield the products. Originality/value -The results support the assertion that the technology developed by the authors' company to produce 80,000 MTPY epoxy resins results in fewer side reactions and higher yield production.

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“…When 1,3‐benzoxazine polymerizes, it undergoes near‐zero volume shrinkage,5 gains high thermal6 and chemical7 stability, and exhibits unusually low surface energy 8. If non‐polymerized benzoxazine group is part of a polymer material whether it is in the main chain itself,9–15 as a side group,16–19 or as a terminal group,20–22 the material exhibits thermoplastic properties such as solubility in common solvents and film forming. These polymeric benzoxazine molecules can then be heated with or without added initiators and/or catalyst to form cross‐linked polybenzoxazines.…”

Section: Introductionmentioning

confidence: 99%

Highly Improved Thermal Properties of Hydroxyl‐Containing Polymers via Modification by Benzoxazine Groups

Chiou

Hollanger

Agag

et al. 2013

Macro Chemistry & Physics

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Isocyanate functional benzoxazine (NCO‐4HBA‐a) is used for coupling with hydroxyl‐group‐containing molecules. Glycerol is used in a model reaction to study the urethane bonds formed between the NCO‐4HBA‐a and the glycerol's hydroxyl groups. The model supports a reaction between NCO‐4HBA‐a and poly(vinyl alcohol) (PVA), which leads to an improved char yield, determined by thermogravimetric analysis. Glycerol‐based benzoxazine is also an attractive benzoxazine synthesized from the products of biofuel production. Upon functionalization with benzoxazine and subsequent thermal treatment, the hydroxyl‐containing polymer gains thermal stability shown by improved char yield of polybenzoxazine cross‐linked PVA.magnified image

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Poly(hydroxyether of bisphenol A)-block-polydimethylsiloxane alternating block copolymer and its nanostructured blends with epoxy resin

Cited by 92 publications

References 69 publications

Toughening of epoxy resin system using a novel dendritic polysiloxane

Toughening of epoxy resin system using a novel dendritic polysiloxane

Development of technology to industrialise the production of 80000 MTPY epoxy resins

Highly Improved Thermal Properties of Hydroxyl‐Containing Polymers via Modification by Benzoxazine Groups

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