Functionalized cellulose nanocrystals as biobased nucleation agents in poly(l-lactide) (PLLA) – Crystallization and mechanical property effects

Pei, Aihua; Zhou, Qi; Berglund, Lars A.

doi:10.1016/j.compscitech.2010.01.018

Cited by 478 publications

(302 citation statements)

References 42 publications

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“…The crystallinity values increased after fiber addition, already at very low fiber loading (Table 3): at 2% and 20% fiber content, there was only a small difference in sample crystallinity. It is well known that various solid particles, including natural fibers (Mathew et al 2006;Pilla et al 2009;Pei et al 2010), can act as nucleating sites, thereby increasing the crystallization rate. Both the first and the second heating cycle of DSC indicated that the presence of fibers increased the rate of crystallization.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

Solala¹,

Koistinen²,

Siljander³

et al. 2015

BioResources

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a High-temperature thermomechanical pulps (HT-TMP, defibrated at 150 to 170 °C) were compared to a reference TMP (defibrated at 130 °C) as a reinforcement for polylactic acid (PLA). Composites were prepared by melt compounding, followed by injection molding, gradually increasing the used fiber content from 0 to 20 wt.%. The injection-molded specimens were characterized by tensile and impact strength tests, scanning electron microscopy, water absorption tests, and differential scanning calorimetry. The TMP fiber damage was also characterized before and after melt compounding by optical analysis. At 20% fiber content, the Young's modulus increased significantly, while the tensile strength remained unchanged and the impact strength decreased slightly. All fibers suffered damage during melt compounding, but the tensile strength remained about the same as in pure PLA. All types of TMP were able to increase the PLA rate of crystallization. The HT-TMP fibers were dispersed more evenly in PLA than the 130 °C TMP. The 170 °C TMP produced composites of lower water absorption than the other two TMP types, probably because of its lower hemicellulose content and its higher surface coverage by lignin.

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Section: Thermal Propertiesmentioning

confidence: 99%

Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

Solala¹,

Koistinen²,

Siljander³

et al. 2015

BioResources

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“…Accelerated PLA isothermal crystallization was also observed in the case of 1 wt% partially silicated cellulose nanocrystals/PLLA microcomposite films. However, the addition of these nano-particles had an unfavorable effect on the mechanical properties because of poor interfacial PLLA-nanocrystals adhesion [31].…”

Section: Introductionmentioning

confidence: 99%

Amino acids and poly(amino acids) as nucleating agents for poly(lactic acid)

Carbone

Vanhalle

Goderis

et al. 2014

Journal of Polymer Engineering

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Abstract:In industry, rapid crystallization is often required. At present, the crystallization rate of poly(lactic acid) (PLA) is too low compared to industrial needs. In this paper, amino acids such as glycine and L-alanine and poly(amino acids) like polyglycine and poly-DL-alanine are considered as heterogeneous crystallization nucleating agents. The impact of adding these bio-based additives on the isothermal crystallization behavior of PLA was quantified and compared at different concentrations by using the so-called Lotz efficiency scale, which here is based on isothermal DSC measurements. In addition, rheological and rheo-optical techniques were used to monitor the isothermal crystallization. Our results indicate that polyglycine possesses a significant nucleating ability (60.5%) which is comparable to the industrially used talc (81.1%).

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“…Softwood (SW) kraft pulp (Revol et al, 1994;Araki et al, 1998;Araki et al, 1999;Pu et al, 2007), SW sulfite pulp (Beck-Candanedo et al, 2005), hardwood (HW) ECF (elemental chlorine free) pulp (Beck-Candanedo et al, 2005), recycle pulp (Filson et al, 2009), cotton fiber (Revol et al, 1994;Dong et al, 1996;Dong et al, 1998;Araki et al, 2000;Hasani et al, 2008;Cao et al, 2009;Pei et al, 2010;Tang & Weder, 2010;Wang et al, 2010), sisal fiber (de Rodriguez et al, 2006;Tang & Weder, 2010), flax fiber (Cao et al, 2007), ramie fiber (Habibi et al, 2007;Habibi & Dufresne, 2008;Zoppe et al, 2009), wheat straw (Helbert et al, 1996), bamboo residue , bacterial microfibrils (Grunert & Winter, 2002), grass fiber (Pandey et al, 2009), tunicate cellulose (Favier et al, 1995;Angles & Dufresne, 2000;Sturcova et al, 2005;Ljungberg et al, 2006;Habibi et al, 2007;Siqueira et al, 2010;Tang & Weder, 2010), microcrystalline cellulose (MCC) Bondeson et al, 2006;Oksman et al, 2006;Bondeson & Oksman, 2007;Bai et al, 2009;Auad et al, 2010; have all been utilized as cellulose sources for whiskers. The most common preparation method employed is acid hydrolysis, including acid sulfuric and hydrochloric acid.…”

Section: Preparation Of Cellulose Nano Whiskersmentioning

confidence: 99%