𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Biodegradable lactone copolymers. I. Characterization and mechanical behavior of ε-caprolactone and lactide copolymers

✍ Scribed by M. Hiljanen-Vainio; T. Karjalainen; J. Seppälä

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
607 KB
Volume
59
Category
Article
ISSN
0021-8995

No coin nor oath required. For personal study only.

✦ Synopsis

Copolymers of c-caprolactone and L-lactide (c-CL/L-LA) and c-caprolactone and DL-lactide (c-CL/DL-LA) were synthesized with compositions 80/20,60/40, and 40/60 (wt % in feed). The polymerization temperature was 140°C and Sn(I1)octoate was used as a catalyst. The effect of the comonomer ratio on the thermal and mechanical properties of the copolymers was investigated by size-exclusion chromatography (SEC), differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR) spectrometry, and tensile testing. The copolymers differed widely in their physical characteristics, ranging from weak elastomers to tougher thermoplastics according to the ratio of c-CL and LA in the copolymerization. Poly (L-lactide) (PLLA), poly(D1-lactide) (PDLLA), and poly(e-caprolactone) (PCL) homopolymers were studied as references. The tensile modulus and tensile strength were much higher for PLLA, PDLLA, and PCL homopolymers than for the copolymers. The maximum strain was very low for PLLA and PDLLA, whereas the copolymers and PCL exhibited large elongation.

📜 SIMILAR VOLUMES

Biodegradable lactone copolymers. II. Hy
Biodegradable lactone copolymers. II. Hydrolytic study of ε-caprolactone and lactide copolymers
✍ M. Malin; M. Hiljanen-Vainio; T. Karjalainen; J. Seppälä 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 784 KB

Copolymers of c-CL/L-LA and c-CLIDL-LA were allowed to age in a buffer solution of pH 7 at 23 and 37°C. The effects of time and temperature on the rate of hydrolysis were examined by various techniques including weighing (water absorption and weight loss), SEC (molecular weight and polydispersity),

Biodegradable lactone copolymers. III. M
Biodegradable lactone copolymers. III. Mechanical properties of ε-caprolactone and lactide copolymers after hydrolysis in vitro
✍ T. Karjalainen; M. Hiljanen-Vainio; M. Malin; J. Seppälä 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 434 KB

Copolymers of c-CL/L-LA and c-CLIDL-LA and for comparison homopolymers PLLA, PDLLA, and PCL were allowed to age in a buffer solution of pH 7 a t 23 and 37°C and studied for the changes in the mechanical properties taking place as a function of hydrolysis time. Tensile modulus measurements showed the

Triblock copolymers of ε-caprolactone, L
Triblock copolymers of ε-caprolactone, L-lactide, and trimethylene carbonate: Biodegradability and elastomeric behavior
✍ Leonardus Kresna Widjaja; Jen Fong Kong; Sujay Chattopadhyay; Vitali T. Lipik; S 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 533 KB

## Abstract For the triblock copolymer of ε‐caprolactone, trimethylene carbonate, and L‐lactide, where L‐lactide blocks form the two ends, there is a range of compositions over which elastomeric behavior is obtained. Within this composition range, these polymers show good creep and recovery at ambi

Preparation, characterization, and drug
Preparation, characterization, and drug release behaviors of drug-loaded ε-caprolactone/L-lactide copolymer nanoparticles
✍ Haixiong Ge; Yong Hu; Shicheng Yang; Xiqun Jiang; Changzheng Yang 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 247 KB 👁 1 views

Copolymers of -caprolactone and L-lactide (PCLLA) with different monomer ratio were synthesized by ring opening polymerization, and drug-loaded nanoparticles of poly--caprolactone (PCL), poly-L-lactide (PLLA), and their copolymers were prepared by precipitation method, respectively. The results of d

Photocurable Shape-Memory Copolymers of
Photocurable Shape-Memory Copolymers of ε-Caprolactone and L-Lactide
✍ Minoru Nagata; Yu Yamamoto 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 494 KB

## Abstract Biodegradable and photocurable block copolymers of __ε__‐caprolactone and L‐lactide were synthesized by polycondensation of PLLA diol ($\overline {M} \_{{\rm n}} $ = 10 000 g · mol^−1^), PCL diol ($\overline {M} \_{{\rm n}} $ = 10 000 g · mol^−1^), and a chain extender bearing a coumari