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RASINI POLIBUTADIENICE (RPB)

RASINI POLIBUTADIENICE (RPB). Proprietati si aplicatii ale RPB. Continut scazut in nuclee aromatice → constanta dielectrica (E) scazuta Rezistenta chimica ridicata (datorita continutului scazut de grupe esterice) Utilizare principala: cupolele transparente ale antenelor de radiolocatie.

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RASINI POLIBUTADIENICE (RPB)

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  1. RASINI POLIBUTADIENICE (RPB)

  2. Proprietati si aplicatii ale RPB • Continut scazut in nuclee aromatice → constanta dielectrica (E) scazuta • Rezistenta chimica ridicata (datorita continutului scazut de grupe esterice) Utilizare principala: cupolele transparente ale antenelor de radiolocatie d=grosimea peretelui cupolei; λo=lungimea de unda a radiatiei incidente pe cupola; E-constanta dielectrica; Θ= unghiul de incidenta

  3. RASINI EPOXIDICE (RE) Def: matrici polimerice termoreactive ce contin minim 2 grupe reactive EPOXI: • Clasificare: • In functie de numarul grupelor epoxi: difunctionale, trifunctionale, tetrafunctionale si polifunctionale • In functie de natura catenei principale: aromatice, alifatice, cicloalifatice • Avantaje generale: • Adezivitate ridicata pentru diversi agenti de rigidizare, umplutura si alte substraturi • In timpul reticularii nu se degaja apa sau substante volatile toxice • Contractie nula dupa reticulare • Prin reticulare rezistenta chimica si dielectrica cresc foarte mult • Varietate mare de RE combinata cu varietatea mare de agenti de reticulare conduc la proprietati diverse ale materialului obtinut dupa reticulare

  4. Sinteza RE Epiclorhidrina Bisfenol A Etapa 1 Etapa 2 Diglicidileterul bisfenolului A (DGEBA)

  5. Sinteza RE • In locul bisfenolului A, la sinteza se mai pot utiliza:

  6. Reticularea RE A. Reticularea cu amine (amine alifatice, aromatice, primare, secundare sau tertiare)

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