Polymer Products, 1st Edition by Fyodor A. Shutov (auth.)

By Fyodor A. Shutov (auth.)

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28), the following relationships have been examined98' 99): Levin 3 3'p + 2 "y(ep - 1) e = ep 3 3,pep - 3,(Cp- 1) (30) Maxwell-Winer e-ep = O g ~ e + 2 ep eg + 2 ep (31) Bruggeman 6-ep : eg -- ep / \ 1/3 (32) \ep/t Rayleigh e=ep l+30g eg-e 2ep+eg Lichtenecker In e = OpInep + Oglneg (34) It has been found that the confidence probability is 90% for Eq. (28), 50% for Eq. (30), 30% for Eq. (31) 10% for Eq, (32) and less than 1% for Eqs. (33) and (34). Therefore, the dielectric permeability of plastic foams is most accurately determ i n e d b y Eq.

7. 9%. Dependences of index r* and constant C 1 on the chemical type of the polymer matrix and the method of surface treatment are discussed below (see Table 4). A. Shutov open cells is of considerable theoretical and practical interest. This dependence has been determined by Shutov and Chainkin88) for rigid PUR (PPU-305A) and epoxidephenolic (PEN-I) foams in the relative humidity range from 60 to 98%. 9%. The function O* = f (Oa, Op, P) (where P is the porosity of the foam) illustrated in Fig.

Cell opening then follows by the sucking of the membrane into the plateau border. " 2. "Water is an essential component of the colloidal structures stabilizing the foam. " Experimental findings of Rossmy et aL substantiate the first mechanism. It has been established that only 18-24 vol% of water is vaporized during foaming. An IR spectroscopic study reveals that the chemical structures of walls and struts differ noticeably. 17 for membranes and struts respectively. This difference in the isocyanate content causes a difference in temperature between membranes and struts and consequently the former lose-more water during foaming.

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