研究目的
To study the behavior of benzoxazine (BOZ) in poly(lactic acid) (PLA) matrix regarding oxygen permeability and UV-shielding properties, and to understand the relationship between them for developing high-barrier PLA films.
研究成果
The PLA/BOZ composite films exhibit enhanced UV-shielding and oxygen barrier properties with high visible light transparency, dependent on BOZ content. The improvements are attributed to the symmetric and aromatic structure of BOZ forming a dense network that absorbs UV light and limits oxygen permeation. This provides new insights for designing functional PLA films, with recommendations for future research on thermal stability and flexibility.
研究不足
The study is limited to PLA/BOZ composites with BOZ content up to 30 wt%; higher contents or other matrices were not explored. The mechanism of oxygen barrier improvement is not fully elucidated, and potential side effects like photocatalysis were not deeply investigated. The thermal degradation behavior and flexibility need further study.
1：Experimental Design and Method Selection:
The study used a solution mixing method to prepare PLA/BOZ composite films with varying BOZ contents (0-30 wt%). The rationale was to investigate the effects of BOZ on UV-shielding and oxygen barrier properties while maintaining high transparency. Theoretical models included analysis of molecular structure and network formation.
2：Sample Selection and Data Sources:
Samples were prepared with PLA pellets and synthesized BOZ powders. Selection criteria were based on weight percentages of BOZ in PLA.
3：List of Experimental Equipment and Materials:
Materials included PLA (3051 D from NatureWorks LLC), BOZ (synthesized), and dichloromethane (CH2Cl2 from Sinopharm Chemical Reagent Co., Ltd.). Equipment included a Nicolet 5700 spectrometer for ATR-FTIR, Bruker Avance DMX 500 MHz spectrometer for 1H-NMR, Pyris Diamond DSC (PerkinElmer), D8 Discover X-ray diffractometer (Bruker-AXS), LV100POL polarized optical microscope (Nikon), JEM-2100 electron microscope (JEOL), Lambda 900 UV-Vis spectrophotometer (PerkinElmer), VAC-V1 gas permeability tester (Labthink), and Pyris 1 thermogravimetric analyzer (PerkinElmer).
4：Experimental Procedures and Operational Workflow:
PLA and BOZ were stirred in CH2Cl2 to form solutions, cast onto glass plates using a doctor blade, dried at 40°C to obtain ~20 μm thick films. Characterization involved FTIR, NMR, DSC, XRD, POM, TEM, UV-Vis, oxygen permeability tests, and TGA under specified conditions.
5：Data Analysis Methods:
Data were analyzed using statistical techniques (e.g., standard deviations from triplicate tests), and software tools associated with the instruments for spectral and thermal analysis.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
Spectrometer
Bruker Avance DMX 500 MHz
Bruker
Obtaining 1H-NMR spectra
-
DSC
Pyris Diamond
PerkinElmer
Differential scanning calorimetry analysis
-
X-ray Diffractometer
D8 Discover
Bruker-AXS
Recording XRD patterns
-
Electron Microscope
JEM-2100
JEOL
Obtaining TEM images
-
UV-Vis Spectrophotometer
Lambda 900
PerkinElmer
UV-visible measurements
-
Thermogravimetric Analyzer
Pyris 1
PerkinElmer
Thermogravimetric analysis
-
PLA
3051 D
NatureWorks LLC
Base polymer material for composite films
-
Dichloromethane
AR grade, 99.5%
Sinopharm Chemical Reagent Co., Ltd.
Solvent for preparing PLA/BOZ solutions
-
Spectrometer
Nicolet 5700
Thermo-Nicolet
Recording ATR-FTIR spectra
-
Polarized Optical Microscope
LV100POL
Nikon
Obtaining POM images
-
Gas Permeability Tester
VAC-V1
Labthink
Evaluating oxygen barrier performance
-
登录查看剩余9件设备及参数对照表
查看全部
