Stereocomplex formation of high-molecular-weight polylactide: A low temperature approach

Bao, Rui‐Ying; Yang, Jie; Jiang, Wen-Rou; Liu, Zhengying; Xie, Bin; Fu, Qiang

doi:10.1016/j.polymer.2012.09.043

Cited by 149 publications

(132 citation statements)

References 27 publications

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“…Conversely, when PLLA or PDLA alone was processed at 180 C, powder did not form. Similar results have been reported in a study of PLLA/PDLA blends at different temperatures using an internal mixer [13,16]. The as-molded PLLA specimens were transparent, an indication of an amorphous state, and became cloudy in the stereocomplex samples suggesting an increase in the degree of crystallinity.…”

Section: Injection Molding Of Plla and Pdla At Various Temperaturessupporting

confidence: 87%

“…On the other hand, the ST-200 molding at 200 C exhibited four different main peaks. The three main diffraction peaks at 2q values around 11.6 , 20.6 , and 23.5 were assigned to the planes of the PLA stereocomplex crystallites and a small diffraction z16 was assigned to the plane of the homocrystallites [6,16,17]. To determine the crystallinity, it is critical to separate the crystalline peaks from the amorphous scattering region.…”

Section: Wide-angle X-ray Diffractionmentioning

confidence: 99%

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Injection molding and characterization of polylactide stereocomplex

Srithep

Pholharn

Turng

et al. 2015

Polymer Degradation and Stability

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Section: Injection Molding Of Plla and Pdla At Various Temperaturessupporting

confidence: 87%

Section: Wide-angle X-ray Diffractionmentioning

confidence: 99%

Injection molding and characterization of polylactide stereocomplex

Srithep

Pholharn

Turng

et al. 2015

Polymer Degradation and Stability

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“…In addition to solution and melting blending, Bao et al prepared high-M w SC-PLA at much lower temperatures compared with general melt processing (112). Exclusive stereocomplex crystallites without HC crystallites of high-M w PLA (white powders) were obtained upon processing at low temperatures such as 160°C.…”

Section: Stereocomplexation Via Physical Blending Routementioning

confidence: 99%

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Jiang

Shen

et al. 2016

E-Polymers

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Poly(lactide), PLA, as one of the most promising biopolymers, has been receiving increasing attention in recent years because of its excellent performances in renewability, mechanical properties, biocompatibility and biodegradability. However, its application is limited by its brittleness and low heat distortion temperatures (HDT). The low HDT mainly results from a low crystallization rate and lack of crystallinity after fast processing, e.g. injection molding. Consequently, considerable attention was paid, in recent years, to achieve fast(er) crystallization of PLA. In here, we briefly review the research progress in the crystallization modification of PLA notably by means of adding nucleating agents and stereocomplexation.

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“…SC‐PLA nascent powder was prepared by melt blending of equimolar PLLA and PDLA at 170 °C, where the powder crystallinity is relatively low . The low crystallinity is favorable for the low‐temperature injection molding of SC‐PLA powder.…”

Section: Resultsmentioning

confidence: 99%

Low‐Temperature Sintering of Stereocomplex‐Type Polylactide Nascent Powder: From Compression Molding to Injection Molding

Liu

Bai

et al. 2018

Macro Materials & Eng

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Stereocomplex (SC) crystallization between poly(l‐lactide) (PLLA) and poly(d‐lactide) (PDLA) exhibits tremendous potential to improve the properties of polylactide (PLA), but the practical processing of SC‐type PLA (SC‐PLA) is significantly hindered by the insufficient melt stability and serious degradation after complete melting of SC crystallites over 240 °C. In a previous work, powder metallurgy inspired low‐temperature (180–210 °C) compression sintering is proposed to fabricate SC‐PLA products from its nascent powder. However, its industrial application is still challenging mainly due to the low production efficiency (half an hour is required) as well as the weak ability to fabricate products with complex shapes. In this work, an effort to rapidly fabricate complex‐shaped SC‐PLA products using low‐temperature injection molding technology is reported, where SC‐PLA nascent powder is partially melted. To ensure appropriate powder flowability, small amounts of glyceryl monostearate are incorporated as a lubricant. The results show that, both the self‐nucleation and flow‐induced nucleation effects facilitate the SC crystallization across the interfaces between adjacent unmelted powder particles, which considerably shortens the sintering cycle to about 2 min. In this way, complex‐shaped SC‐PLA products (such as gears) with superb performance are successfully fabricated by injection molding for the first time.

show abstract

Stereocomplex formation of high-molecular-weight polylactide: A low temperature approach

Cited by 149 publications

References 27 publications

Injection molding and characterization of polylactide stereocomplex

Injection molding and characterization of polylactide stereocomplex

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Low‐Temperature Sintering of Stereocomplex‐Type Polylactide Nascent Powder: From Compression Molding to Injection Molding

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