Impact of phosphorylation on intrinsic and thermal properties of poly(styrenephosphonate esters) and...

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" Impact of phosphorylation on intrinsic and thermal properties of poly(styrenephosphonate esters) and their blends with cellulose acetate "
J. Sun I. Cabasso

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112578
Doc. No	:	TLpq303724765
Main Entry	:	I. Cabasso
	:	J. Sun
Title & Author	:	Impact of phosphorylation on intrinsic and thermal properties of poly(styrenephosphonate esters) and their blends with cellulose acetate\ J. SunI. Cabasso
College	:	State University of New York College of Environmental Science and Forestry
Date	:	1989
student score	:	1989
Degree	:	Ph.D.
Page No	:	249
Abstract	:	The intrinsic and thermal characteristics of poly(styrenephosphonate diethyl ester) (PSP) are quantitatively analyzed. The properties of the polymers prepared by two synthetic procedures, phosphorylation of monodispersed polystyrene and polymerization of vinylbenzylphosphonate ester (VBP), are compared with each other and with chloromethylated polystyrene. Thermal analysis reveals a sharp drop in Tg with increasing degrees of phosphorylation; the values of the product of T{\rm g}\DeltaCp decrease significantly with the increase in the degree of phosphorylation. The characteristics of PVBP and its copolymers with methyl methacrylate are also presented. The characterizations of polymer blends, consisting of PSP derivatives and cellulose acetates (CA), using differential scanning calorimetry (DSC), Fourier transform infrared (FT-IR) spectroscopy, and transmission electron microscopy (TEM) are discussed. Thermal analysis of miscible PSP/CA blends reveals a significant melting temperature depression of the crystalline fraction of CA, as the content of PSP in the blend is increased. The values of interaction parameter (usd\chiusd) are determined and shown to be strongly dependent on the volume fraction of PSP and its degree of phosphorylation. The composition-dependent intrinsic and thermal properties for this polymer blend system are presented. The TEM reveals regular variations of the morphology of the blends with change in the degree of phosphorylation of PSP. The morphological features of the blends, such as the size of dispersed phase, or the extent of interpenetration between the components, are controlled by the amount of the phosphoryl ester groups which form the specific interactions in the blends. In blends with low degrees of phosphorylation, the morphologies can be manipulated by simply varying the composition of constituents. Interactive infrared spectra of phosphoryl and hydroxyl bands of the miscible blends show significant interactions involving hydrogen bonding between PSP and CA. The interaction strength is correlated to the shift of the phosphoryl band by comparing the hydrogen bonding of tributyl phosphate with water. A method by which mean diffusion coefficients are obtained from the dissolution of a thermodynamically miscible polymer pair in a DSC cell is described. The time scale for such dissolution and aspects of mass-transport phenomenon are thus determined for the specific blend PSP/CA.
Subject	:	Acetate
	:	Applied sciences
	:	Esters
	:	Materials science
	:	Polymers
	:	Pure sciences