02263nas a2200229   4500008004100000022001400041245010800055210006900163260009900232300001000331490000700341520139900348653001801747653001301765653001901778653001301797653002201810100002801832700002901860700002601889856011801915       2016                        eng d  a0032-386100aImproved performance of microcapsules with polymer nanocomposite wall: preparation and characterization0 aImproved performance of microcapsules with polymer nanocomposite  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN  a27-330 v833 a<p>Polyurea/clay nanocomposite microcapsules containing dimethyl phthalate (DMP) as a model compound were prepared by interfacial polymerization technique. Nanoclays namely, montmorillonite Na+ (MMT) and Laponite were incorporated into microcapsule wall and their effects on morphology, thermal properties and release of DMP from microcapsules were investigated. All microcapsules were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. The present preparation process results in formation of polyurea/clay nanocomposite microcapsule wall with intercalated clay layered as evidenced by XRD and TEM. Nanocomposite microcapsules have shown significant reduction in release of DMP and change in release mechanism as compared to the pristine microcapsules. Nanocomposite microcapsules show good improvement in the fracture strength as compared to pristine microcapsules. The approach used herein is simple and can be adopted to many other polymeric microcapsule systems prepared by different microencapsulation techniques, requiring reduction in release rate and/or mechanism for several applications like pharmaceuticals, agrochemicals, industrially important chemicals, consumer products, etc. (C) 2015 Elsevier Ltd. All rights reserved.</p>10aMicrocapsules10aNanoclay10aNanocomposites10aPolyurea10aRelease mechanism1 aJagtap, Siddheshwar, B.1 aMohan, Muthu, Subramania1 aShukla, Parshuram, G.  uhttp://library.ncl.res.in/content/improved-performance-microcapsules-polymer-nanocomposite-wall-preparation-and-002012nas a2200181   4500008004100000245012100041210006900162260000800231300001400239490000800253520131800261100002601579700002801605700002401633700002401657700002101681856012801702       2016                        eng d00aPreparation and characterization of microcapsules containing industrially important reactive water-soluble polyamine0 aPreparation and characterization of microcapsules containing ind  cDEC  a2039-20500 v2943 aPolyurea microcapsules containing water-soluble reactive polyamine, namely, polyaziridine (A33), were prepared by interfacial polymerization technique in non-aqueous medium, wherein (i) A33 was encapsulated for the first time as a neat amine without forming its salt or adduct and (ii) microcapsules formed were without any deleterious effect on A33. A systematic study was conducted by preparing microcapsules with different polyurea wall architectures. Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (H-1 NMR) spectroscopic analysis of extracted A33 from microcapsules do not show any structural changes during microencapsulation. A titration method was developed to analyze the amount of encapsulated A33 quantitatively. Polyurea microcapsules obtained from reaction of ethylene diamine (E) and isophorone diisocyanate (I) monomers have shown better properties such as encapsulation efficiency and extent of agglomeration. Significant reduction in the size was observed when microcapsules of EI wall material were prepared by homogenizing the initial emulsion of A33 in paraffin oil. The process described in this paper for the preparation of microcapsules is cost-effective and industrially viable, which can find applications in agrochemicals, coatings, self-healing composites, etc.1 aShukla, Parshuram, G.1 aJagtap, Siddheshwar, B.1 aBiradar, Satish, C.1 aCharpe, Vaibhav, P.1 aJadhav, Arun, S.  uhttp://library.ncl.res.in/content/preparation-and-characterization-microcapsules-containing-industrially-important-reactive01701nas a2200145   4500008004100000245013900041210006900180260000800249300001000257490001000267520110600277100002801383700002001411856012401431       2017                        eng d00aEffect of molecular weight of curing agents on properties of nanocomposites based on epoxy resin and organoclay with reactive modifier0 aEffect of molecular weight of curing agents on properties of nan  cMAR  a445950 v134  3 aNanocomposites of epoxy resin and clay modified with half neutralized salt of Jeffamine D400 were prepared by curing separately with three polyetheramines curing agents of different molecular weights and reactivity. The molecular weight of curing agents and their structural similarity with modifier played an important role in deciding the curing behavior, thermomechanical, and morphological properties of epoxy/clay nanocomposites. Morphological analysis carried out by X-ray diffraction (XRD) and transmission electron microscope (TEM) clearly show that the dispersion of clay layers in epoxy matrix decreases with decreasing molecular weight of the curing agents. Curing study done by using temperature modulated differential scanning calorimetry (MDSC) demonstrates that extragallery reaction rate increases with decreasing molecular weight of curing agents. Dynamic mechanical analysis (DMA) of epoxy/3 wt % modified clay composite prepared by curing with curing agent of higher molecular weight shows around 270% improvement in storage modulus (glassy) as compared with its neat epoxy network.1 aJagtap, Siddheshwar, B.1 aRatna, Debdatta  uhttp://library.ncl.res.in/content/effect-molecular-weight-curing-agents-properties-nanocomposites-based-epoxy-resin-and01888nas a2200229   4500008004100000245010700041210006900148260000800217300001000225490000800235520107000243100002801313700002201341700002101363700001501384700002901399700002601428700002201454700002601476700003101502856012501533       2018                        eng d00a Functionalized carbon nanotube reinforced polymer nanocomposite microcapsules with enhanced stiffness0 aFunctionalized carbon nanotube reinforced polymer nanocomposite   cAUG  a82-890 v5503 aMicrocapsules with tunable mechanical properties are highly desirable in pressure sensitive applications. We report here a facile approach to prepare polyurea/multiwall carbon nanotube (MWCNTs) nanocomposite microcapsules (MICs) with enhanced stiffness. A model compound dimethyl phthalate (DMP) was used as core material. MWCNTs were modified with reactive functional groups namely carboxyl (-COOH), amines (-NH2), and isocyanates (-NCO) to ensure a stronger interface between polymer wall and MWCNTs. Functionalization of MWCNTs was corroborated by Fourier transformed infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was employed to study the surface morphology of MICs. The presence of MWCNTs in the microcapsule wall was confirmed by transmission electron microscopy (TEM). MICs with functionalized MWCNTs show almost 100% increase in stiffness with respect to pristine capsules. All MICs show 92-97 +/- 1% encapsulation efficiency. The approach used in this paper can be broadly utilized to tune the mechanical properties of the microcapsules.1 aJagtap, Siddheshwar, B.1 aPatil, Vishal, D.1 aSuresh, Karthika1 aRam, Farsa1 aMohan, Muthu, Subramania1 aRajput, Shatruhan, S.1 aPatil, Shivprasad1 aShukla, Parshuram, G.1 aShanmuganathan, Kadhiravan  uhttp://library.ncl.res.in/content/functionalized-carbon-nanotube-reinforced-polymer-nanocomposite-microcapsules-enhanced