Thermal Decomposition of Cellulose/Synthetic Polymer Blends Containing Grafted Products III. Cellulose/Poly(methyl acrylate) Blends

Abstract

ABSTRACT:The homogeneous grafting of methyl acrylate onto cellulose was carried out in a dimethyl sulfoxide/ paraformaldehyde solvent system. The grafted products were added to cellulose/poly(methyl acrylate) (PMA) blends as compatibilizers. The thermal decomposition behavior of the blends was investigated by thermogravimetry. The thermal stability of the blends decreased with an increase in grafted product content. Accessibility determined by a deuteration method increased with grafted product content and peak intensity of wide-angle X-ray diffraction patterns decreased. The microphase-separated structures of the blends with higher grafted product content were finer than those of the blends without grafted products. Dynamic mechanical measurements and differential scanning calorimetry were carried out to determine the glass transition temperatures, T 8 , of the blends. T, for cellulose decreased with an increase in grafted product content but that for PMA hardly varied. The difference in thermal decomposition behavior of the blends was correlated to that in compatibility. Thermogravimetry was effective for compatibility estimation in cellulose/PMA blends containing grafted products.KEY WORDS Thermal Decomposition / Cellulosic Blend / Grafted Product / Compatibilizer / We reported that the thermal decomposition behavior of the vinyl monomer grafted cellulose products depends remarkably on their graft copolymer contents. 1 • 2 In grafting, a graft copolymer and attendant homopolymer are synthesized simultaneously. 3 .4 Some of main chains not participating in grafting also remain. The grafted products thus are polymer blends containing graft copolymers as compatibilizers. The difference in thermal stability of the grafted cellulose products was correlated to compatibility. 1 • 2 The grafted products with different graft copolymer contents are necessary to correlate thermal stability with compatibility more precisely. In a series of our work, 5 • 6 the grafted products themselves were added to the cellulose/synthetic polymer blends as compatibilizers to vary graft copolymer content widely. In this work, methyl acrylate (MA) grafted cellulose products were added to cellulose/poly(methyl acrylate) (PMA) blends. EXPERIMENT AL Grafting and Sample PreparationHomogeneous grafting of MA onto cellulose in a dimethyl sulfoxide/paraformaldehyde (DMSO/PF) solvent system and characterization of the grafted products were performed by the method described previously. 7 -io The grafted products are characterized in Table I. In homogeneous grafting, the molecular weight of the graft polymer is presumed to be equal to that of the attendant homopolymer. 3 • 4 We confirmed that both molecular weights are consistent with each other within experimental error. 8 • 10 The viscosity-average molecular weights, Mv, of the extracted PMA thus were used as those of the graft polymers. The values of M" of cellulose and PMA used for the blends were estimated to be 146 x 10 3 and 290 x 10 3 from the intrinsic viscosities obtained with cadoxen 1...

Thermal decomposition of cellulose/synthetic polymer blends containing grafted products. V. Cellulose/polystyrene blends

“…The weight of cellulose/g‐PS 2/PS (9/0/1) blend without g‐PS 2 decreases sharply at around 300°C and the second decrease occurs at around 430°C, indicating the presence of two thermal decomposition processes. As indicated previously,4–8, 23, 24 the weight decrease at around 300°C results from the decomposition of cellulose. The decomposition at around 430°C, thus, is assigned to that of PS.…”

“…Dimethyl sulfoxide (DMSO) containing paraformaldehyde has been used as a solvent for cellulose in our previous work 4–8, 16–19. In this work, a dimethylacetamide (DMAc)/lithium chloride (LiCl) solvent system was used because of an insolubility of PS in DMSO.…”

“…However, cellulose does not undergo a clear glass transition because of its hydrogen bonding ability. The difficulty in determining T g for cellulosic blends has been reported 4–13. In a series of our previous work,5–8 the thermal decomposition behavior of the cellulosic blends containing compatibilizers was investigated.…”

Differential Pulse Voltammetric Determination and Application of Square‐Wave Voltammetry of yRNA on a CPB‐Cellulose Modified Electrode

“…The modified electrode was stored at 4 8C when unused. The CPB-cellulose viscose solution [34,35] were formed by taking the 1.0 g cellulose, 7.0 g PE, 0.5 g CPB and 25 mL DMSO in the 50 mL dry three-orifice flask with condenser and mixer, and heating at 120 8C.…”

Preparation of Sodium carboxymethylcellulose/poly(methyl acrylate) IPN hydrogels and their application for adsorption

“…Liu kun studied on properties of grafted copolymer of corn starch and MA which showed good plasticity and biodegradability . However, it is rarely to find researches about blending hydrophobic polymers with natural macromolecules except for the series researches conducted by Nishioka Noboru . As a highly hydrophobic polymer, PMA is difficult to be applied in aqueous systems.…”