THE CRYSTALLIZATION AND MISCIBILITY OF POLY( L-LACTIDE)/POLY(DL-LACTIDE) BLENDS

LIAO Kairong; QUAN Daping; GAO Jianwen; LUO Binghong; LU Zejian

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THE CRYSTALLIZATION AND MISCIBILITY OF POLY( L-LACTIDE)/POLY(DL-LACTIDE) BLENDS

Research Article | 更新时间：2021-03-19

- THE CRYSTALLIZATION AND MISCIBILITY OF POLY( L-LACTIDE)/POLY(DL-LACTIDE) BLENDS
- Acta Polymerica Sinica Issue 2, Pages: 137-141(2002)
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- Published：20 April 2002，
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LIAO Kairong, QUAN Daping, GAO Jianwen, LUO Binghong, LU Zejian. THE CRYSTALLIZATION AND MISCIBILITY OF POLY( L-LACTIDE)/POLY(DL-LACTIDE) BLENDS. [J]. Acta Polymerica Sinica (2):137-141(2002)
DOI：

LIAO Kairong, QUAN Daping, GAO Jianwen, LUO Binghong, LU Zejian. THE CRYSTALLIZATION AND MISCIBILITY OF POLY( L-LACTIDE)/POLY(DL-LACTIDE) BLENDS. [J]. Acta Polymerica Sinica (2):137-141(2002) DOI：

摘要

用共溶液沉淀法制备了聚(L-丙交酯)/聚(DL-丙交酯 )共混物(PLLA/PDLLA)

然后用成纤模压法压制成φ3.2mm的棒材 .用差示扫描量热法研究了共混物的结晶性能和相溶性 .结果表明

PLLA组分在共溶液沉淀过程中可生成结晶

共混物中PDLLA含量直到30%时

PLLA组分的结晶熔融温度和结晶度与纯PLLA相同

但PDLLA含量为50%时

PLLA组分的结晶熔融温度和结晶度明显下降 .由于加工成型条件的不一致性

共混物棒材中的PLLA组分的结晶熔融温度和结晶度呈较大的分散性 .共混物从熔体降温

在其后的升温DSC扫描中出现分别相应于PDLLA和PLLA的玻璃化转变

表明PDLLA与未结晶的PLLA形成的非晶相是不相溶的.

Abstract

Poly(L-lactide)／poly(DL-lactide)(PLLA/PDLLA) blends were prepared hy co-solution precipitation．They were molded into φ 3.2 mm rods by a method of fibrillated compression. The crystallization and miscibility of the blends were studied using differential scanning calorimetry(DSC)．The results showed that the PLLA component can crystallize in the process of co-solution precipitation．The melting temperature(Tm) and crystallinity (Xc) of PLLA component are identical with those of the pure PLLA until the content of PDLLA in the blends up to 30％；however

they are decreased obviously for the blend containing 50％ PDLLA．The Tm and Xc of the PLLA component in the rods scattered significantly and this may be attributed to their inconsistency in preparation．It was found that two glass transitions corresponding respectively to PDLLA and PLLA occurred in DSC heating scannings of the blends．This may indicate that PDLLA and the non-crystalline PLLA in the blends are immiscible．

关键词

聚(L丙交酯)聚(DL丙交酯)共混物结晶性能相溶性

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