The control of expansion ratios and cellular structure of supercritical CO2-aid thermoplastic starch foams using crosslinking agents and nano-silica particles

被引：8

作者：

Cheng, Xiao-Han ^{[1
]}

Wang, Ke ^{[1
]}

Cheng, Nian-Qi ^{[1
]}

Mi, Si-Yu ^{[1
]}

Sun, Liang-Shuang ^{[1
]}

Yeh, Jen-Taut ^{[1
]}

机构：

[1] Hubei Univ, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Key Lab Green Preparat & Applicat Funct Mat, Minist Educ,Hubei Key Lab Polymer Mat,Fac Mat Sci, Wuhan, Peoples R China

来源：

JOURNAL OF POLYMER RESEARCH | 2021年 / 28卷 / 08期

关键词：

ScCO2-assisted thermoplastic starch foams; Sodium hexametaphosphate; Nano-SiO2; Expansion ratio; Resilience rate; MICROCELLULAR FOAM; POLY(LACTIC ACID); SOLVENT EXCHANGE; MELT RHEOLOGY; SODIUM HEXAMETAPHOSPHATE; MECHANICAL-PROPERTIES; BIODEGRADABLE FOAMS; PHYSICAL-PROPERTIES; FLUID EXTRUSION; CARBON-DIOXIDE;

D O I：

10.1007/s10965-021-02664-1

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The expansion ratio, resilience rate, moisture-proof, complex dynamic viscosity and crystallization rate for scCO(2)-aid glutaraldehyde modified thermoplastic starch (SC(a)TSGA(1.6)) foams were substantially improved by further modification with sodium hexametaphosphate (SHP) and/or nano-silica (nano-SiO2) particles during their scCO(2)-assisted foaming processes. These properties of SHP modified SC(a)TSGA(1.6) (SC(a)TSGA(1.6)SHP(b) and SC(11)TSGA(1.6)SHP(4)SiO(2)(c)) foams were further improved with increasing scCO(2)-pressures during their scCO(2)-assisted foaming processes. Extremely high expansion ratio of similar to 65 and high resilience rate of 77% of the most appropriate SC(11)TSGA(1.6)SHP(4)SiO(2)(0.5) foam were originally prepared using scCO(2)-assisted foaming processes. The significantly enhanced reliance rate found for SC(a)TSGA(1.6)SHP(b) and SC(11)TSGA(1.6)SHP(4)SiO(2)(c) foams is attributed to the better resilience of the smaller cell structures. Moreover, reaction of phosphate groups of SHP with the moisture-sensitive O-H groups of starch did occur favorably, and substantially improved the moisture-proof and complex dynamic viscosity (or melt strength) during the scCO(2)-assisted modification processing of SC(a)TSGA(1.6)SHP(b) and SC(11)TSGA(1.6)SHP(4)SiO(2)(c). Thermal analyses revealed that crystallization rates and crystallization onset temperatures for SC(11)TSGA(1.6)SHP(4)SiO(2)(c) were substantially improved by addition of nano-SiO2 particles. This substantial increase in melt strength, higher dissolved CO2 concentrations at larger scCO(2)-pressures and/or higher crystallization rates for SC(a)TSGA(1.6)SHP(b) and/or SC(11)TSGA(1.6)SHP(4)SiO(2)(c) are expected to considerably enhance their nucleation rate and stability of cell structures during their scCO(2)-aid foaming processes. Consequently, higher expansion ratio, cell density and better reliance rate was found after the scCO(2)-aid foaming processes of SC(a)TSGA(1.6)SHP(b) and SC(11)TSGA(1.6)SHP(4)SiO(2)(c) foams.

引用

页数：13

共 73 条

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