聚乳酸/SiO_X薄膜的制备及对气体的透过性和选择性  

Preparation of Poly( L-lactic acid)/SiO_x Film and Its Gas Permeability and Permselectivity

作　　者：宋树鑫[1] 梁敏[1] 王羽[1] 刘林林[1] 张玉琴[1] 齐小晶[1] 董同力嘎 

机构地区：[1]内蒙古农业大学食品科学与工程学院,内蒙古呼和浩特010018

出　　处：《高分子材料科学与工程》2016年第11期135-139,共5页Polymer Materials Science & Engineering

基　　金：内蒙古科技创新引导奖励资助项目(209-202111);国家自然科学基金资助项目(51163010);内蒙古草原英才工程(2011)

摘　　要：采用等离子体增强化学气相沉积法(PECVD)在聚乳酸(PLLA)薄膜表面沉积SiO_X层,以改善PLLA薄膜对气体的透过性和选择性。通过红外光谱仪和压差法透气仪分别对沉积效果和薄膜透气性进行测试。结果表明,PLLA/SiO_X复合膜相比纯PLLA膜,其对气体的透过性有所下降,而选择性有所提高。在25℃时,40μm的PLLA/SiO_X膜对O_2、CO_2、N_2和水蒸气的透过性分别降低了58.9%,48.6%,67.8%和52.3%,透气比α(CO_2/O_2)、α(O_2/N_2)和α(CO_2/N_2)则分别平均提高了20.0%,21.8%和37.5%;25℃时,60μm的PLLA/SiO_X膜对O_2、CO_2、N_2和水蒸气的透过性分别降低了23.8%,14.5%,46.7%和49.5%,透气比α(CO_2/O_2)、α(O_2/N_2)和α(CO_2/N_2)则分别提高了10.7%,30.7%和38.2%。To improve the gas permeability and permselectivity of poly （L-lactic acid） （PLLA）, SiOx coatings were deposited on the surface of PLLA films by plasma enhanced chemical vapour deposition （PECVD） process. The deposition effect and gas permeability were evaluated by FT-IR and manometric gas permeation analyzer. PLLA/SiOx films show reduced gas permeability and improved gas permselectivity, over ;chose of uncoated PLLA film. Thereinto, 40 μm PLLA/SiOx films show 02, CO2, Na and vapour permeability reduced by 58.9%, 48.6%, 67.8% and 52.3%, meanwhile show a（C02/02）, a（O2/N2） and μ（CO2/N2） improved by 20.0%, 21.8% and 37.5 % at 25 ℃, respectively. 60μm PLLA/SiOx films show 02, CO2, N2 and vapour permeability reduced by 23.8%, 14.5%, 46.7% and 49.5%, meanwhile show a（C02/02）, a（02/Nz）, and a（CO2/N2） improved by 10.7%, 30.7% and 38.2% at 25 ℃, respectively.

关 键 词：聚乳酸 等离子体增强化学气相沉积法 SiOx层 气体透过性 气体选择性 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]