Rheological and Thermal Properties of Saponified Cassava Starch- g- Poly( acrylamide) Superabsorbent Polymers Varying in Grafting Parameters and Absorbency

被引:30
作者
Parvathy, Prabha C. [1 ]
Jyothi, Alummoottil. N. [1 ]
机构
[1] Cent Tuber Crops Res Inst, Div Crop Utilizat, Thiruvananthapuram, Kerala, India
关键词
biomaterials; biopolymers & renewable polymers; copolymers; differential scanning calorimetry (DSC); glass transition; RESPONSE-SURFACE METHODOLOGY; SWELLING BEHAVIOR; POLYACRYLAMIDE; HYDROGELS; WATER; STARCH-GRAFT-POLY(ACRYLAMIDE); ACID; OPTIMIZATION; FLOCCULANT; COPOLYMERS;
D O I
10.1002/app.40368
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Cassava starch-graft-poly(acrylamide) superabsorbent polymers (SAPs) with varying absorbencies were synthesized. Weight average molecular weight (M-w) of the hydrolyzed starch-graft-copolymers ranged from 1.6 x 10(6) to 2.8 x 10(6) g/mol, the largest being shown by the sample with highest percentage grafting. The storage (G) and loss modulus (G) of hydrogels were determined as a function of frequency. G was larger than G for the hydrogels with higher absorbencies and exhibited a liquid-like behavior. However, hydrogels with lower absorbencies showed a reverse viscoelastic behavior. The viscosity of hydrogels determined using a Brookfield viscometer at different shear rates was found to be larger for the hydrogels with higher absorbencies. The melting temperature (T-m) and enthalpy change of fusion (H-f) of the SAPs ranged from 149.7 to 177.7 degrees C and 65 to 494.9 J/g, respectively and showed a positive correlation with grafting parameters and M-w. Heavy metal ion removal capacity of hydrogel followed the order Cu2+>Pb2+>Zn2+. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40368.
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页数:11
相关论文
共 49 条
[41]   The releases of agrochemicals from radiation induced acrylamide crotonic acid hydrogels [J].
Saraydin, D ;
Karadag, E ;
Güven, O .
POLYMER BULLETIN, 1998, 41 (05) :577-584
[42]  
*SAS I INC, 2000, SAS STAT SOFTW VERS
[43]   Macroporous poly(N-isopropyl)acrylamide networks:: formation conditions [J].
Sayil, C ;
Okay, O .
POLYMER, 2001, 42 (18) :7639-7652
[44]   Gel strength and swelling of acrylamide-protic acid superabsorbent copolymers [J].
Seetapan, Nispa ;
Wongsawaeng, Jiraporn ;
Kiatkamjornwong, Suda .
POLYMERS FOR ADVANCED TECHNOLOGIES, 2011, 22 (12) :1685-1695
[45]   Polyacrylamide Grafted Carboxymethyl Tamarind (CMT-g-PAM): Development and Application of a Novel Polymeric Flocculant [J].
Sen, Gautam ;
Pal, Sagar .
MACROMOLECULAR SYMPOSIA, 2009, 277 :100-111
[46]  
Shrogen R. L., 2009, CARBOHYD POLYM, V75, P189
[47]   Microwave-accelerated synthesis and characterization of potato starch-g-poly(acrylamide) [J].
Singh, Vandana ;
Tiwari, Ashutosh ;
Pandey, Sadanand ;
Singh, Somit Kumar .
STARCH-STARKE, 2006, 58 (10) :536-543
[48]   Synthesis and application of starch-graft-poly(AM-co-AMPS) by using a complex initiation system of CS-APS [J].
Song, Hui ;
Zhang, Shu-Fen ;
Ma, Xi-Chen ;
Wang, Da-Zhi ;
Yang, Jin-Zong .
CARBOHYDRATE POLYMERS, 2007, 69 (01) :189-195
[49]   Initiator effects in reactive extrusion of starch-polyacrylamide graft copolymers [J].
Willett, JL ;
Finkenstadt, VL .
JOURNAL OF APPLIED POLYMER SCIENCE, 2006, 99 (01) :52-58