Mechanical and nonisothermal cold crystallization behaviors of injection molded surface‐modified chitin whiskers/poly(l‐lactide) composites

Abstract

To improve the mechanical, crystallization performances of poly(L-lactide) (PLLA), pristine and surface grafted chitin whiskers (CWs and g-CWs) were introduced to PLLA via melt blending. Attributed to the good interfacial compatibility between the g-CWs and PLLA matrix, the tensile, flexural, and impact performances of the g-CWs/PLLA composites were better than that of the CWs/PLLA composites with the same whiskers content. The whiskers acted as nucleating agents to promote the crystallization of the PLLA matrix on the one hand, and acted as obstacles to restrict the crystals growth on the other hand. The nonisothermal cold crystallization kinetics revealed that the crystallization rate and crystallinity of the PLLA matrix were improved by the addition of the whiskers, but the promotion effect of g-CWs was more obvious than CWs.

Thermomechanical performance of biodegradable poly (lactic acid)/carbonaceous hybrid nanocomposites: Comparative study

“…This can be achieved by blending with other types of biodegradable polymers [6,7] as well as the development of composites and nanocomposites containing high aspect ratio organic and inorganic fillers. [8][9][10][11][12][13][14][15] Over the last years, numerous types of carbon/based nanomaterials, including carbon nanotubes (CNTs), carbon nanofibers (CNFs) and graphene nanoparticles, have been utilized as additives into a bulk polymeric matrix, to adjust their mechanical, thermal, and electrical properties for a number of targeted applications. This is due to their exceptional structures and special properties, such as low density, high aspect ratio, [16] high modulus, tensile strength, [17] and remarkable electrical [18] and thermal conductivities.…”

“…This can be achieved by blending with other types of biodegradable polymers [ 6,7 ] as well as the development of composites and nanocomposites containing high aspect ratio organic and inorganic fillers. [ 8–15 ]…”

Nonisothermal crystallization behavior and mechanical properties of poly(lactic acid)/ramie fiber biocomposites

“…The presence of RF results in reduction of t 1/2 , indicating nucleation effect. [ 30 ] Using a cooling rate of 5°C/min, the t 1/2 values for PLA, 5RF, and 20RF are 7.40, 6.49, and 4.59 min, respectively. The result demonstrates that the RF can shorten the crystallization time of PLA.…”