@article { ISI:000369001500017, title = {Toughening of epoxy novolac resin using cardanol based flexibilizers}, journal = {Journal of Applied Polymer Science}, volume = {133}, number = {16}, year = {2016}, month = {APR}, pages = {43318}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

In this work, two different cardanol based epoxies (Cardolite NC-514 and Cardanol NC-547) were employed as flexibilizers to toughen an epoxy novolac resin namely, poly[(phenylglycidyl ether)-co-formaldehyde] (PPGEF). 4,4-Diamino-3,3-dimethyl dicyclohexyl methane (BMCHA) was used as a curing agent. Differential scanning calorimetry and dynamic mechanical thermal analysis of the composites showed a gradual decrease in glass transition temperatures (T-g) with increase in cardolite content confirming the incorporation of flexible moieties into the brittle resin matrix. Improvement in toughening of PPGEF/Cardolite composites was manifested by increase in the izod impact strength of both the composites. The tensile strength increased marginally for composites with increasing amount of Cardolite NC-514 but decreased for the composites containing Cardolite NC-547. This was attributed to the lack of rotational motion in the chain due to close proximity of rigid phenyl rings in NC-547. SEM of the cryo-fractured surfaces of composites showed good compatibility between PPGEF and cardanol based flexibilizers. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43318.

}, keywords = {composites, crosslinking, glass transition}, issn = {0021-8995}, doi = {10.1002/app.43318}, author = {Gour, Rajeshwari S. and Kodgire, Vivek V. and Badiger, Manohar V.} } @article {43806, title = { Design and development of trivalent aluminum ions induced self healing polyacrylic acid novel hydrogels}, journal = {POLYMER}, volume = {126}, year = {2017}, month = {SEP}, pages = { 196-205}, type = {Journal Article}, chapter = {196-205}, abstract = {

Development of ionically crosslinked superabsorbent polyacrylic acid (PAA) self-healing hydrogels using trivalent aluminum ions was investigated. The PAA hydrogels exhibited excellent self-healing behavior depending on the amount of the aluminum within the matrix. The migration of these ions within the polymer matrix was responsible for the physical crosslinking of the hydrogel and the origin of self healing ability. The PAA-Al hydrogels were insoluble in water and exhibited significantly high degree of swelling (similar to 4000\%). Hydrogel also exhibited good mechanical properties with high level of elongation. Excellent self-healing efficiency was observed under dynamic as well as oscillatory Theological measurements. The presence of Al ions within PAA hydrogel facilitated the self-healing ability because of the ionic interaction in these gels which plays the key role of dynamic reversible sacrificial bonds which reforms upon reversal of the deformative force. (C) 2017 Elsevier Ltd. All rights reserved.

}, keywords = {Aluminum chloride, Behavior, Complex, Composite, crosslinking, Delivery, High-Mechanical Strength, hydrogels, Network, Polyacrylic acid, Polymeric Materials, Self-healing, swelling, Tough; pH}, issn = {0032-3861}, doi = {10.1016/j.polymer.2017.08.045}, author = {Anjum, Sadiya and Gurave, Pramod and Badiger, Manohar V. and Tiwari, Neha and Gupta, Bhuvanesh} }