Oxidation of sesbania gum using an octenyl succinate-esterified composite

Figures & data

Table 1. Freeze-thaw stability of SG and modified SG.

samples	water absorption rate/%
SG	67.9 ± 2.2^A
OSG	83.7 ± 1.9 ^B
OSSG	28.8 ± 1.2 ^C
OOSSG	32.6 ± 1.7 ^C

Note: The water absorption rate are shown as mean ± standard deviation of the triplicates.

Different superscript letters in different fractions indicate significant differences (p < 0.05).

Table 2. Swelling power of SG and modified SG.

samples	swelling power/%
SG	46.3 ± 2.0 ^A
OSG	19.7 ± 0.2 ^B
OSSG	17.3 ± 0.3 ^B
OOSSG	15.2 ± 0.1 ^B

Note: The swelling power are shown as mean ± standard deviation of the triplicates.

Different superscript letters in different fractions indicate significant differences (p < 0.05).

Figure 1. FTIR spectra of SG, OSG,OSSG and OOSSG.

Figure 2. XRD curves of SG, OSG and OOSSG.

Figure 3. DSC curves of SG, OSG and OOSSG.

Table 3. DSC thermodynamic data of SG, OSG and OOSSG.

Samples	Onset temperature /°C	Peak temperature /°C	End temperature /°C	Enthalpy change /J.g^−1
SG	34.3 ± 0.5 ^A	83.4 ± 3.4 ^A	162.1 ± 6.4 ^A	225.6 ± 7.8 ^A
OSG	42.4 ± 0.9 ^B	98.1 ± 3.2 ^B	185.6 ± 3.2 ^B	335.6 ± 4.7 ^B
OOSSG	33.1 ± 1.1	90.4 ± 4.5	195.2 ± 5.5 ^B	337.0 ± 6.9 ^B

Note: The Onset temperature, Peak temperature, End temperature and Enthalpy change are shown as mean ± standard deviation of the triplicates.

Different superscript letters in different fractions indicate significant differences (p < 0.05).

Figure 4. TGA curves of SG, OSG and OOSSG.

Note: Sesbania gum (SG); oxidative sesbania gum (OSG); octenyl succinated composite-modified sesbania gum (OSSG); oxidative octenyl succinated composite-modified sesbania gum (OOSSG)

Table 4. TGA thermodynamic data of SG, OSG and OOSSG.

Samples	Onset decomposition temperature /°C	End decomposition temperature /°C	Weight loss rate / %
SG	247.6 ± 5.5 ^A	329.3 ± 10.5 ^A	69.5 ± 5.4 ^A
OSG	262.7 ± 9.4 ^B	346.2 ± 6.6	64.3 ± 3.8
OOSSG	232.7 ± 7.6	365.1 ± 7.4 ^B	62.3 ± 3.6 ^B

Note: The Onset decomposition temperature, End decomposition temperature and Weight loss rate are shown as mean ± standard deviation of the triplicates.

Different superscript letters in different fractions indicate significant differences (p < 0.05).