Stereocomplexation and Mechanical Properties of Polylactide-<italic style="font-style: italic">b</italic>-poly(propylene glycol)-<italic style="font-style: italic">b</italic>-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio

Dutchanee Pholharn; Onanong Cheerarot; Yodthong Baimark

doi:10.1007/s10118-017-1989-3

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Stereocomplexation and Mechanical Properties of Polylactide-b-poly(propylene glycol)-b-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio

Papers | Updated：2021-02-18

- Stereocomplexation and Mechanical Properties of Polylactide-b-poly(propylene glycol)-b-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio
- Chinese Journal of Polymer Science Vol. 35, Issue 11, Pages: 1391-1401(2017)
- Affiliations：
  
  Biodegradable Polymers Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand
- Author bio：
  
  Yodthong Baimark, E-mail:yodthong.b@msu.ac.th
- Funds：
- DOI：10.1007/s10118-017-1989-3
  CLC：
- Received：22 March 2017，
  
  Revised：2017-5-19，
  
  Accepted：02 June 2017，
  
  Published：05 November 2017
- Accepted：
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Dutchanee Pholharn, Onanong Cheerarot, Yodthong Baimark. Stereocomplexation and Mechanical Properties of Polylactide-b-poly(propylene glycol)-b-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio[J]. Chinese Journal of Polymer Science, 2017, 35(11): 1391-1401. DOI: 10.1007/s10118-017-1989-3.
DOI：

Dutchanee Pholharn, Onanong Cheerarot, Yodthong Baimark. Stereocomplexation and Mechanical Properties of Polylactide-b-poly(propylene glycol)-b-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio[J]. Chinese Journal of Polymer Science, 2017, 35(11): 1391-1401. DOI: 10.1007/s10118-017-1989-3. DOI：

摘要

Abstract

In the present work

poly(propylene glycol) (PPG) was block copolymerized to form polylactide-poly(propylene glycol)-polylactide (PL-PPG-PL) triblock copolymers for preparing flexible stereocomplex PL (scPL) blend films. The scPL blend films were prepared by solution blending of poly(L-lactide)-PPG-poly(L-lactide) (PLL-PPG-PLL) and poly(D-lactide)-PPG-poly(D-lactide) (PDL-PPG-PDL) triblock copolymers before film casting. The influences of PL end-block lengths (2×10

and 4×10

g/mol) and blend ratios (75/25

50/50 and 25/75

W/W

) on the stereocomplexation and mechanical properties of the blend films were evaluated. From DSC and WAXD results

the 50/50 blend films had complete stereocomplexation. Phase separation between the scPL and PPG phases was not observed from their SEM images. The tensile stress and elongation at break increased with the sterecomplex crystallinities and PL end-block lengths. The PPG middle-blocks enhanced elongation at break of the scPL films. The results showed that the PL-PPG-PL triblock structures did not affect stereocomplexation of the PLL/PDL block blending. In conclusion

the phase compatibility and flexibility of the scPL films were improved by PPG block copolymerization.

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Stereocomplexation and Mechanical Properties of Polylactide-b-poly(propylene glycol)-b-polylactide Blend Films:Effects of Polylactide Block Length and Blend Ratio

DOI：10.1007/s10118-017-1989-3

摘要

Abstract

关键词

Keywords

references