A low cure thermo active polymerization of chalcone based benzoxazine and cross linkable olefin blends

Alagar, Muthukaruppan; Arumugam, Hariharan; Sumathy, K.; Kannan, K. G.; Chavali, Murthy

doi:10.1007/s10965-018-1556-9

Cited by 32 publications

(20 citation statements)

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“…Introduction of photoreactive functionalities, coumarin [ 208 , 209 , 210 , 211 ], chalcone [ 212 ], and bis-benzylidene as another smart feature in Bz monomer is reported. This created their capability for photodimerization [ 213 , 214 ] and exploration for self-healing applications. Kiskan and Yagci [ 209 ] utilized photoreactive coumarin functionality containing phenol, methyl substituted umbelliferone (MU), and p -toluidine ( p t) based benzoxazine monomer, which upon irradiation at 300 nm underwent photodimerization via [2π + 2π] cycloaddition with alkenyl bonds as shown in Figure 18 a.…”

Section: Classification Of Benzoxazine Monomersmentioning

confidence: 99%

“…The methyl group in coumarin in MU-a indirectly affects the reactivity of oxazine by being less electrophilic, i.e., less electron-withdrawing in nature, and thus, it has lower stability and hence accounts for observed higher ROP temperature than U-a. Alagar et al [214] extended copolymerization of chalcone benzoxazine with bismaleimides to improve thermal stability of polymers. [208] and (b) bis-benzylidene containing benzoxazine monomers and their light mediated dimerization [213].…”

Section: Smart Benzoxazine Monomersmentioning

confidence: 99%

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Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

et al. 2021

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Due to their outstanding and versatile properties, polybenzoxazines have quickly occupied a great niche of applications. Developing the ability to polymerize benzoxazine resin at lower temperatures than the current capability is essential in taking advantage of these exceptional properties and remains to be most challenging subject in the field. The current review is classified into several parts to achieve this goal. In this review, fundamentals on the synthesis and evolution of structure, which led to classification of PBz in different generations, are discussed. Classifications of PBzs are defined depending on building block as well as how structure is evolved and property obtained. Progress on the utility of biobased feedstocks from various bio-/waste-mass is also discussed and compared, wherever possible. The second part of review discusses the probable polymerization mechanism proposed for the ring-opening reactions. This is complementary to the third section, where the effect of catalysts/initiators has on triggering polymerization at low temperature is discussed extensively. The role of additional functionalities in influencing the temperature of polymerization is also discussed. There has been a shift in paradigm beyond the lowering of ring-opening polymerization (ROP) temperature and other areas of interest, such as adaptation of molecular functionality with simultaneous improvement of properties.

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Section: Classification Of Benzoxazine Monomersmentioning

confidence: 99%

Section: Smart Benzoxazine Monomersmentioning

confidence: 99%

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

et al. 2021

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“…Chalcones are compounds containing α,β unsaturated carbonyl system which are extensively explored as biologically active compounds 1–7 . The α,β unsaturated bond in chalcones can undergo 2 + 2 cycloaddition on exposure to UV irradiation 8–13 which is explored in applications require in situ crosslinking. The biocompatibility and the material versatility imbibed curiosity of many in incorporating this molecule as part of polymer.…”

Section: Introductionmentioning

confidence: 99%

Polychalcones based on triphenylamine and carbazole building blocks via Claisen–Schmidt route

Jayalakshmi

Keerthika

Santhanagopal

2021

J of Applied Polymer Sci

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Alternating and random copolymers of carbazole and triphenylamine containing polychalcones are prepared by adopting simple Claisen–Schmidt route via A2 + B2 approach. Terephthaldehyde derivative was used as an additional comonomer along with bisaldehyde of triphenylamine to obtain a random copolymer. The prepared polymers are readily soluble in common organic solvents and the polymers exhibited narrow poly dispersity. The polymers are thermally stable and no observable degradation is observed until 350°C. Further, the spin cast thermally annealed films on glass substrate indicated corrugated surface as measured by scanning electron microscope and atomic force microscopy, which could facilitate for greater interaction at the interfaces. Photophysical properties of the polymers in solution and in thin film showed excellent emission characteristics. Both alternating and random copolymers showed a high quantum yield of 0.74 on comparison with quinine sulfate. Polychalcones with triphenylamine/carbazole showed oxidative response in cyclic voltammetry which suggested the suitability as electrochemical sensors and antioxidant coating material.

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“…In this context, the most probable matrix resin suitable for the fabrication of composites is considered as polybenzoxzines, since these resins possesses easy process-ability, cures without release of by-product, low shrinkage behaviour, molecular exibility, excellent thermal stability, improved chemical resistance, good mechanical properties, excellent hydrophobic nature and cost competitive. (Hariharan et al 2017a(Hariharan et al , 2018 , (Kim and Ishida 2001;Froimowicz et al 2016;Kotzebue et al 2018;Lyu and Ishida 2019) , (Muthukaruppan et al 2018) Till date, relatively, a meagre attention has been paid to bio-based benzoxazine composites. (Wang et al 2012) In the recent past researchers directed their attention towards bio-based polybenzoxazines in particular cardanol based benzoxazines and their applications.…”

Section: Introductionmentioning

confidence: 99%

Rice husk and saw dust reinforced hybridized blends of bio-benzoxazine/epoxy based composites: Thermal, Mechanical, and Acoustic Absorption Properties

Arumugam

Krishnasamy

Dilip

et al. 2021

Preprint

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The prime objective of the present work is to develop bio-wastes (rice husk and saw dust) reinforced composites with varying weight percentages composition of hybridized blend made from bio-based cardanol-melamine, cardanol-aniline benzoxazine and epoxy resin (bio-benzoxazine : epoxy resin 0:100 and 50:50 wt%)for acoustic proof applications. The breakthrough achieved in the present work is the cardanol benzoxazine is made in the form of hybrid matrix with epoxy resin, which cures significantly at lower temperature of 1050C in the absence of any curatives and also cures at room temperature in the presence of isophorone diamine curative,whereas the cardanol-melamine and cardanol-aniline based benzoxazines cure at very high temperature of 221˚C and 275 ˚C respectively. The low temperature cure behaviour achieved in the present work facilitates the amenable fabrication of bio-composites using both low heat resistant bio-based reinforcements and high temperature cure bio-benzoxazines for making cost competitive green building materials. Cardanol-melamine (C-m) and cardanol-aniline (C-a) based benzoxazines were synthesised using cardanol separately with melamine (m) and aniline (a) in the presence of paraformaldehyde under suitable experimental conditions. The benzoxazine (C-m and C-a) obtained was blended with varying weight percentages of bisphenol-A epoxy (DGEBA) resin separately followed by reinforcing with rice husk and saw dust and then cured at room temperature with stoichiometric quantity of isophorone diamine to obtain corresponding hybrid bio-composites. Mechanical properties (tensile strength, modulus, percentage elongation and hardness), thermal conductivity, thermal resistance, and sound absorption coefficient were studied as per standard methods. Results obtained from different studies infer that hybrid blended cardanol benzoxazine composite panels reinforced with rice husk and saw dust possess appreciable thermal, mechanical and acoustic properties. Data obtained from acoustic studies, it was observed that the highest value of sound absorption coefficient of 6400 Hz was noticed for composite specimens developed using both rice husk and saw dust reinforced with hybridized blend of bio-benzoxazine (50wt%) and epoxy resin (50wt%) and these hybrid composite panels can be used as sound absorption material in the ceiling and wall construction applications.

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A low cure thermo active polymerization of chalcone based benzoxazine and cross linkable olefin blends

Cited by 32 publications

References 38 publications

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

Review on the Accelerated and Low-Temperature Polymerization of Benzoxazine Resins: Addition Polymerizable Sustainable Polymers

Polychalcones based on triphenylamine and carbazole building blocks via Claisen–Schmidt route

Rice husk and saw dust reinforced hybridized blends of bio-benzoxazine/epoxy based composites: Thermal, Mechanical, and Acoustic Absorption Properties

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