The graft copolymerization of corn starch by microwave irradiation with rheological phase reaction

Abstract

The corn starch was grafted by microwave irradiation with rheological phase reaction, to meet the sizing requirements of polyester/cotton blended yarn and avoid the disadvantages of corn starch size including brittle, hard, and size shedding. On the basis of the damping characteristics of corn starch film and the polarity of grafting monomer, the grafting effect of grafted corn starch was researched by using infrared spectroscopy, SEM, rotary viscometer, and thermomechanical analyzer. The results showed that both hydrophilic groups and hydrophobic groups were introduced in the molecular chains of grafted corn starch. The storage modulus of grafted corn starch film reached 285-315 MPa, being four times higher than that of nongrafted corn starch film. Compared with corn starch sizing, the viscosity of grafted corn starch sizing decreased 62.5%. Furthermore, through analyzing grafting law and establishing regression equation, it was indicated that the irradiation time and initiator content influenced the grafting ratio of grafted starch significantly. The grafting ratio could reach 19.57%, when the irradiation time and initiator content were selected with 3.5 min and 4.55%, respectively.

Thermoresponsive and biocompatible poly(vinyl alcohol)‐graft‐poly(N,N‐diethylacrylamide) copolymer: Microwave‐assisted synthesis, characterization, and swelling behavior

“…26,27 To control the grafting percent, the exposure time of irradiation and microwave power is controlled electronically, providing exact reproducibility and control of the grafting percent. 26,27 To control the grafting percent, the exposure time of irradiation and microwave power is controlled electronically, providing exact reproducibility and control of the grafting percent.…”

Sizing process of cotton yarn by size from a copolymer of methacrylic acid and hydrolyzed potato starch

“…3 Chemical modification provides a new chance to improve the essential shortcomings of natural starch, so current research on the improvement of the adhesion of starchy materials is directed to the application of chemical modification. [1][2][3][4] Of all the modification methods, co-polymerization of vinyl monomers and starch is a very significant research field, with unlimited possibilities for improving the starch properties.…”

Graft copolymerization of acrylic acid onto hydrolyzed potato starch using various initiators

“…Several techniques are used with the aim to introduce a chemical group or to modify starch molecules in some way to improve adhesion. Among all procedures, graft polymerization of vinyl monomers to starch looks like very fascinating research field having unlimited potentials for improvement of starch properties [6,7].…”