Natural weathering studies of oil palm trunk lumber (OPTL) green polymer composites enhanced with oil palm shell (OPS) nanoparticles

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Table 2 Effect of OPS nanoparticles impregnation into OPTL on weight loss and weight loss prevention ratio after 6 and 12 months of weathering

Nanoparticles (%)	Weight loss (%)		Weight loss prevention ratios (%)
Nanoparticles (%)	6 months	12 months	6 months	12 months
OPTL	37.31 (0.89)*	41.09 (0.97)*	-	-
0	28.25 (0.79)Aa	36.37 (0.85) Ab	+24.28	+11.49
1	26.84 (0.82) Aa	31.84 (1.00) Ab	+4.94	+12.46
3	24.95 (0.95) Aa	31.47 (0.91) Ab	+16.68	+13.47
5	18.93 (0.86) Ba	25.59 (0.95) Bb	+32.99	+29.64
10	22.06 (1.03) Aa	29.51 (1.04) Ab	+21.25	+18.86

Values are means (n = 5); *Values in parentheses are standard deviation; different upper and lower case letters indicate significant differences at 95% confidence level.