SYNTHESIS AND CHARACTERIZATION OF MONOFUNCTIONAL BENZOXAZINE FROM CARDANOL

A novel thermoplastic polybenzoxazine was synthesized based on agrochemical renewable cardanol–a by–product of cashew nut shell liquid (CNSL). A solventless synthesis of monofunctional benzoxazine monomer based on cardanol, aniline and paraformaldehyde was carried out. The liquid benzoxazine monomer was characterized by 1HNMR and FTIR spectroscopy. Curing characteristics at different temperatures were studied and monitored by differential scanning calorimeter (DSC). The appearance of two exothermic peaks associated with reaction of double bonds of the aliphatic side–chain and ring opening polymerization of benzoxazine. High thermal stability of the polymer sample was confirmed by thermogravimetric analysis (TGA)

Egzaktna rješenja nepolinomnog međudjelovanja

Exact solvability of a non-polynomial interaction is investigated. The relation to the existence of a double-well potential is discussed, with a presentation of a new type of exact solutions.Istražuje se egzaktno rješavanje nepolinomnog međudjelovanja. Raspravlja se problem dvojamnog potencijala i predstavljaju novi tipovi egzaktnih rješenja

Problem svojstvenih vrijednosti za višečlani potencijal s inverznim racionalnim potencijama

It is shown that eigenspectra corresponding to various interactions with three- and two-term inverse fractional power are, under certain conditions, analytically tractable either by using the solution of the biconfluent Heun\u27s equation or by using the quasi-exactly solvable sl(2) symmetry approach.Pokazuje se kako se, pod izvjesnim uvjetima, mogu analitički odrediti svojstvene vrijednosti za razna međudjelovanja s tri ili dva člana s inverznim racionalnim potencijama, primjenom bilo rješenja bikonfluentne Heunove jednadžbe, ili poluegzaktno rješivim pristupom sa sl(2) simetrijom

Egzaktna rješenja nepolinomnog međudjelovanja

Exact solvability of a non-polynomial interaction is investigated. The relation to the existence of a double-well potential is discussed, with a presentation of a new type of exact solutions.Istražuje se egzaktno rješavanje nepolinomnog međudjelovanja. Raspravlja se problem dvojamnog potencijala i predstavljaju novi tipovi egzaktnih rješenja

Curing Characteristics, Mechanical Properties And Morphology Of Surface Modified Montmorillonite Filled Natural Rubber Nanocomposites [TN948.M72 C235 2008 f rb].

Komposit nano getah asli telah disediakan dengan menggunakan ‘Standard Malaysian Rubber’ (SMR L), montmorillonite yang bersifat organofilik (tanah liat organo) dan pengisi hybrid hitam karbon/tanah liat organo. Natural rubber (NR) nanocomposites was investigated by using Standard Malaysian Rubber (SMR L) grade, organophilic modified montmorillonite (organoclay) and carbon black/organoclay as hybrid filler

Kvazi-egzaktno rješivi potencijal

It is shown that for any exactly solvable potential considered here, belonging to the class of the first generation, there are always posibilities to construct the class of second generation potentials, which are either exactly solvable or quasi-exactly solvable. The alternatives exactly solvable or quasi-exactly solvable depend on the choice of the "base" related to the set of excited eigenstates corresponding to the first generation potentials.Pokazuje se da za svaki ovdje razmatrani egzaktno-rješivi potencijal, koji pripada razredu prve generacije, uvijek postoji mogućnost složiti razred druge generacije potencijala koji su ili egzaktno rješivi ili kvazi-egzaktno rješivi. Inačice egzaktno rješivi ili kvazi-egzaktno rješivi ovise o izboru “baze” koja se odnosi na skup viših svojstvenih stanja koji je vezan s prvom generacijom potencijala

Singularni i egzaktno rješivi potencijali

The potentials involving singularities considered in this work result from the construction starting with higher-order-generation superpotentials. The second generation with a single base as well as the third one with a double base will be discussed. According to the choice of these bases, a number of results, which may be interesting from the theoretical point of view, can be observed such as the partial breaking of the symmetry or the construction of a new type of exactly solvable potentials which show existence of eigenstates with positive eigenvalues. Extension to the third generation potential of the theorem on quasi-exact solvability will also be discussed.Potencijali sa singularnostima koji se razmatraju u ovom radu slijede iz postavki za generacije superpotencijala višeg reda. Raspravlja se druga generacija s jednom osnovicom i treća generacija s dvije osnovice. Ovisno o odabiru osnovica, nalazi se niz rezultata koji mogu biti zanimljivi sa stanovišta teorije, kao djelomično kršenje simetrije ili postavka nove vrste egzaktno rješivih potencijala koji pokazuju postojanje svojstvenih stanja s pozitivnim svojstvenim vrijednostima. Raspravlja se također proširenje teorema o kvazi-egzaktnoj rješivosti za potencijale treće generacije