Although NR has enhanced the hydrophobility of the PLA surfaces, water absorption does not decrease, on the contrary, NR seems has an effect on increasing water absorption. Fig. 2 shows the percentage moisture absorption of PLA and PLA/NR blends as a function of t1/2 at immersion temperature of 58 C which is also the hydrolysis temperature compared to the compost temperature in international standard [28]. There are four distinct chronological regimes on moisture absorption: (1) a quickly water absorption which is a simple water in-diffusion (t1/2 ¼ 0e30), (2) moistureabsorption does not increase with time increasing, the specimen reaches its water saturate (t1/2 ¼ 30e100), (3) water uptake begins
again and absorption rate increases with immersion time (t1/2 ¼ 100e165), (4) the absorption reaches the maximum value and the moisture absorption seems to start decrease (t1/2 > 165).
Although NR has enhanced the hydrophobility of the PLA surfaces, water absorption does not decrease, on the contrary, NR seems has an effect on increasing water absorption. Fig. 2 shows the percentage moisture absorption of PLA and PLA/NR blends as a function of t1/2 at immersion temperature of 58 C which is also the hydrolysis temperature compared to the compost temperature in international standard [28]. There are four distinct chronological regimes on moisture absorption: (1) a quickly water absorption which is a simple water in-diffusion (t1/2 ¼ 0e30), (2) moistureabsorption does not increase with time increasing, the specimen reaches its water saturate (t1/2 ¼ 30e100), (3) water uptake beginsagain and absorption rate increases with immersion time (t1/2 ¼ 100e165), (4) the absorption reaches the maximum value and the moisture absorption seems to start decrease (t1/2 > 165).
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